Release Token Tools 0.1.0

.gitignore

@@ -0,0 +1,9 @@
+node_modules/
+dist/
+release/*.zip
+release/*.zip.sha256
+coverage/
+playwright-report/
+test-results/
+*.tsbuildinfo
+.DS_Store

.npmrc

@@ -0,0 +1 @@
+@add-ideas:registry=https://git.add-ideas.de/api/packages/lotobo/npm/

CHANGELOG.md

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+# Changelog
+
+## 0.1.0 - 2026-09-01
+
+- Initial nested token editor with multi-set themes and ordered overrides.
+- Added aliases, cycle detection and color/dimension/typography/shadow validation.
+- Added W3C-style JSON, CSS, Sass, Android XML and Swift exports with loss reports.
+- Added offline support, automated tests and deterministic packaging.

CONTRIBUTING.md

@@ -0,0 +1,3 @@
+# Contributing
+
+Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.

LICENSE

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+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSES/README.md

@@ -0,0 +1,3 @@
+# Licences
+
+The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.

README.md

@@ -0,0 +1,45 @@
+# Token Tools
+
+Edit, validate and export design tokens locally in the browser. Token Tools supports plain W3C-style nested JSON and a local multi-set wrapper using `$sets` plus ordered `$themes`.
+
+## Features
+
+- Bounded nested JSON editor and a focused path/type/value editor.
+- Set composition with later-set overrides and theme previews.
+- `{path.to.token}` alias resolution, missing-target errors, cycle detection and type warnings.
+- Color, dimension, typography, shadow, number, string and boolean validation.
+- W3C-style JSON, CSS custom properties, Sass, Android XML and Swift/UIKit exports.
+- Target-safe string escaping, identifier-collision detection and a loss report that never silently drops unsupported composite semantics.
+- Offline PWA and shared system/light/dark Toolbox shell.
+
+## Document shape
+
+A plain nested object is treated as the `default` set. For themes:
+
+```json
+{
+  "$sets": { "core": {}, "dark": {} },
+  "$themes": { "light": ["core"], "dark": ["core", "dark"] }
+}
+```
+
+Each token uses `$type` and `$value`; group `$type` values are inherited. This is a practical W3C-style interchange, while `$sets` and `$themes` are an application wrapper rather than a claim of W3C standardization.
+
+## Limits
+
+Documents are capped at 1 MiB, depth 64 and 10,000 tokens (with a 50,000 JSON-node parsing bound). Malformed wrappers, unknown declared types and token/group shape conflicts fail explicitly. No imported value is executed. Android and Swift composite output needs project conventions, so unsupported values are omitted with explicit losses.
+
+## Development
+
+```sh
+npm ci
+npm run check
+npm run test:browser
+npm run package:release -- --force
+```
+
+The deterministic release is `release/token-tools-0.1.0.zip` with a SHA-256 sidecar. Node.js 22+ and npm 11 are required.
+
+## Licence
+
+GPL-3.0-or-later.

SECURITY.md

@@ -0,0 +1,5 @@
+# Security policy
+
+Report vulnerabilities privately to the repository owner. Supported version: 0.1.x.
+
+Token Tools makes no uploads, telemetry or third-party requests. JSON is parsed as inert data under text, depth, node and token-count bounds. Exporters escape Android XML and quote Swift strings. Generated source remains an input to another toolchain and must be reviewed before production use.

SOURCE.md

@@ -0,0 +1,10 @@
+# Source identity
+
+- Project: Token Tools
+- Version: 0.1.0
+- Repository: https://git.add-ideas.de/lotobo/token-tools
+- Licence: GPL-3.0-or-later
+- Build: Node.js 22+, npm 11, `npm ci && npm run release:artifact`
+- Artifact: `token-tools-0.1.0.zip`
+
+The lockfile pins dependencies exactly. Generated release manifests repeat this source identity and releases include detected runtime licence texts under `LICENSES/`.

THIRD_PARTY_NOTICES.md

@@ -0,0 +1,5 @@
+# Third-party notices
+
+Token Tools is GPL-3.0-or-later. Runtime dependencies are React, React DOM and the add·ideas Toolbox Contract, Shell and Helpers packages. Exact versions and declared licences are recorded in `package-lock.json`; detected runtime licence texts are generated into release archives at `LICENSES/npm-runtime-licenses.txt`.
+
+“W3C-style” describes the `$type`/`$value` nested interchange shape and does not imply W3C endorsement or conformance certification.

docs/ACCESSIBILITY.md

@@ -0,0 +1,3 @@
+# Accessibility
+
+Every editor has a native label. Token lists use buttons with visible selection, parse errors use alert regions, and validation never relies on colour alone. Tables provide header cells, export output is selectable text, the responsive layout becomes one column on narrow screens and the shared shell supplies visible focus and system/light/dark themes.

docs/ARCHITECTURE.md

@@ -0,0 +1,5 @@
+# Architecture
+
+The applied JSON document is separate from the editing draft, so malformed intermediate input never replaces the last valid state. `core/tokens.ts` extracts inherited nested tokens, composes ordered sets, resolves aliases through a guarded graph walk and validates resolved values. Export adapters consume only the selected theme's resolved records and append every unsupported conversion to a loss report.
+
+The `$sets`/`$themes` wrapper is local metadata; W3C-style export emits a plain nested `$type`/`$value` object. All Vite assets are relative for nested portal mounting, and release packaging fixes ordering, permissions and timestamps.

docs/PRIVACY-SECURITY.md

@@ -0,0 +1,5 @@
+# Privacy and security
+
+All input stays in memory in the current browser. CSP allows only same-origin connections and the application initiates none. There is no telemetry, storage, account or remote asset.
+
+Parsing is capped at 1 MiB, depth 64, 50,000 JSON values and 10,000 extracted tokens. Aliases are exact path references and cannot execute expressions. CSS/Sass strings, XML and Swift strings are target-escaped; normalized identifier collisions and unsupported composite values are recorded as explicit losses.

eslint.config.mjs

@@ -0,0 +1,37 @@
+import js from "@eslint/js";
+import globals from "globals";
+import reactHooks from "eslint-plugin-react-hooks";
+import reactRefresh from "eslint-plugin-react-refresh";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  {
+    ignores: [
+      "dist",
+      "release",
+      "coverage",
+      "test-results",
+      "playwright-report",
+    ],
+  },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ["**/*.{ts,tsx}"],
+    languageOptions: {
+      ecmaVersion: 2023,
+      globals: { ...globals.browser, ...globals.worker },
+    },
+    plugins: { "react-hooks": reactHooks, "react-refresh": reactRefresh },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      "react-refresh/only-export-components": [
+        "warn",
+        { allowConstantExport: true },
+      ],
+    },
+  },
+  {
+    files: ["scripts/**/*.mjs", "playwright.config.ts"],
+    languageOptions: { globals: globals.node },
+  },
+);

index.html

@@ -0,0 +1,19 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta
+      name="description"
+      content="Edit, validate and export design tokens locally in the browser."
+    />
+    <link rel="icon" type="image/svg+xml" href="./favicon.svg" />
+    <link rel="manifest" href="./manifest.webmanifest" />
+    <meta name="theme-color" content="#29255f" />
+    <title>Token Tools</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="./src/main.tsx"></script>
+  </body>
+</html>

package.json

@@ -0,0 +1,71 @@
+{
+  "name": "token-tools",
+  "version": "0.1.0",
+  "description": "Edit, validate and export design tokens locally in the browser.",
+  "license": "GPL-3.0-or-later",
+  "author": "Albrecht Degering",
+  "repository": {
+    "type": "git",
+    "url": "git+https://git.add-ideas.de/lotobo/token-tools.git"
+  },
+  "homepage": "https://git.add-ideas.de/lotobo/token-tools",
+  "bugs": {
+    "url": "https://git.add-ideas.de/lotobo/token-tools/issues"
+  },
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=22"
+  },
+  "scripts": {
+    "predev": "npm run manifest:generate",
+    "dev": "vite",
+    "prebuild": "npm run release:prepare && npm run manifest:generate",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview",
+    "typecheck": "tsc -b --pretty false",
+    "lint": "eslint . --max-warnings=0",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:browser": "playwright test",
+    "manifest:generate": "node scripts/generate-toolbox-manifest.mjs",
+    "manifest:check": "node scripts/generate-toolbox-manifest.mjs --check",
+    "release:prepare": "node scripts/prepare-release-files.mjs",
+    "toolbox:check": "toolbox-check dist",
+    "package:release": "node scripts/package-release.mjs",
+    "check": "npm run manifest:check && npm run typecheck && npm run lint && npm run format:check && npm run test && npm run build && npm run toolbox:check",
+    "release:artifact": "npm run check && npm run test:browser && npm run package:release -- --force"
+  },
+  "dependencies": {
+    "@add-ideas/toolbox-helpers": "0.1.0",
+    "@add-ideas/toolbox-contract": "0.2.3",
+    "@add-ideas/toolbox-shell-react": "0.2.3",
+    "react": "19.2.8",
+    "react-dom": "19.2.8"
+  },
+  "devDependencies": {
+    "@add-ideas/toolbox-testkit": "0.2.3",
+    "@eslint/js": "10.0.1",
+    "@playwright/test": "1.62.1",
+    "@testing-library/jest-dom": "6.9.1",
+    "@testing-library/react": "16.3.2",
+    "@testing-library/user-event": "14.6.1",
+    "@types/node": "25.9.5",
+    "@types/react": "19.2.17",
+    "@types/react-dom": "19.2.5",
+    "@vitejs/plugin-react": "6.0.3",
+    "eslint": "10.7.0",
+    "eslint-plugin-react-hooks": "7.1.1",
+    "eslint-plugin-react-refresh": "0.5.2",
+    "globals": "17.7.0",
+    "jsdom": "29.1.1",
+    "prettier": "3.9.5",
+    "typescript": "6.0.3",
+    "typescript-eslint": "8.64.0",
+    "vite": "8.2.2",
+    "vitest": "4.1.11"
+  },
+  "packageManager": "npm@11.17.0"
+}

playwright.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig, devices } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "./tests/browser",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 120_000,
+  expect: { timeout: 10_000 },
+  reporter: [["list"]],
+  use: { baseURL: "http://127.0.0.1:4183", trace: "retain-on-failure" },
+  webServer: {
+    command: "npm run build && node scripts/serve-test.mjs",
+    url: "http://127.0.0.1:4183",
+    reuseExistingServer: !process.env.CI,
+    timeout: 180_000,
+  },
+  projects: [
+    { name: "chromium", use: { ...devices["Desktop Chrome"] } },
+    { name: "firefox", use: { ...devices["Desktop Firefox"] } },
+  ],
+});

public/CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+
+## 0.1.0 - 2026-09-01
+
+- Initial nested token editor with multi-set themes and ordered overrides.
+- Added aliases, cycle detection and color/dimension/typography/shadow validation.
+- Added W3C-style JSON, CSS, Sass, Android XML and Swift exports with loss reports.
+- Added offline support, automated tests and deterministic packaging.

public/CONTRIBUTING.md

@@ -0,0 +1,3 @@
+# Contributing
+
+Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.

public/LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
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+
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+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
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+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
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+
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

public/LICENSES/README.md

@@ -0,0 +1,3 @@
+# Licences
+
+The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.

public/README.md

@@ -0,0 +1,45 @@
+# Token Tools
+
+Edit, validate and export design tokens locally in the browser. Token Tools supports plain W3C-style nested JSON and a local multi-set wrapper using `$sets` plus ordered `$themes`.
+
+## Features
+
+- Bounded nested JSON editor and a focused path/type/value editor.
+- Set composition with later-set overrides and theme previews.
+- `{path.to.token}` alias resolution, missing-target errors, cycle detection and type warnings.
+- Color, dimension, typography, shadow, number, string and boolean validation.
+- W3C-style JSON, CSS custom properties, Sass, Android XML and Swift/UIKit exports.
+- Target-safe string escaping, identifier-collision detection and a loss report that never silently drops unsupported composite semantics.
+- Offline PWA and shared system/light/dark Toolbox shell.
+
+## Document shape
+
+A plain nested object is treated as the `default` set. For themes:
+
+```json
+{
+  "$sets": { "core": {}, "dark": {} },
+  "$themes": { "light": ["core"], "dark": ["core", "dark"] }
+}
+```
+
+Each token uses `$type` and `$value`; group `$type` values are inherited. This is a practical W3C-style interchange, while `$sets` and `$themes` are an application wrapper rather than a claim of W3C standardization.
+
+## Limits
+
+Documents are capped at 1 MiB, depth 64 and 10,000 tokens (with a 50,000 JSON-node parsing bound). Malformed wrappers, unknown declared types and token/group shape conflicts fail explicitly. No imported value is executed. Android and Swift composite output needs project conventions, so unsupported values are omitted with explicit losses.
+
+## Development
+
+```sh
+npm ci
+npm run check
+npm run test:browser
+npm run package:release -- --force
+```
+
+The deterministic release is `release/token-tools-0.1.0.zip` with a SHA-256 sidecar. Node.js 22+ and npm 11 are required.
+
+## Licence
+
+GPL-3.0-or-later.

public/SECURITY.md

@@ -0,0 +1,5 @@
+# Security policy
+
+Report vulnerabilities privately to the repository owner. Supported version: 0.1.x.
+
+Token Tools makes no uploads, telemetry or third-party requests. JSON is parsed as inert data under text, depth, node and token-count bounds. Exporters escape Android XML and quote Swift strings. Generated source remains an input to another toolchain and must be reviewed before production use.

public/SOURCE.md

@@ -0,0 +1,10 @@
+# Source identity
+
+- Project: Token Tools
+- Version: 0.1.0
+- Repository: https://git.add-ideas.de/lotobo/token-tools
+- Licence: GPL-3.0-or-later
+- Build: Node.js 22+, npm 11, `npm ci && npm run release:artifact`
+- Artifact: `token-tools-0.1.0.zip`
+
+The lockfile pins dependencies exactly. Generated release manifests repeat this source identity and releases include detected runtime licence texts under `LICENSES/`.

public/THIRD_PARTY_NOTICES.md

@@ -0,0 +1,5 @@
+# Third-party notices
+
+Token Tools is GPL-3.0-or-later. Runtime dependencies are React, React DOM and the add·ideas Toolbox Contract, Shell and Helpers packages. Exact versions and declared licences are recorded in `package-lock.json`; detected runtime licence texts are generated into release archives at `LICENSES/npm-runtime-licenses.txt`.
+
+“W3C-style” describes the `$type`/`$value` nested interchange shape and does not imply W3C endorsement or conformance certification.

public/docs/ACCESSIBILITY.md

@@ -0,0 +1,3 @@
+# Accessibility
+
+Every editor has a native label. Token lists use buttons with visible selection, parse errors use alert regions, and validation never relies on colour alone. Tables provide header cells, export output is selectable text, the responsive layout becomes one column on narrow screens and the shared shell supplies visible focus and system/light/dark themes.

public/docs/ARCHITECTURE.md

@@ -0,0 +1,5 @@
+# Architecture
+
+The applied JSON document is separate from the editing draft, so malformed intermediate input never replaces the last valid state. `core/tokens.ts` extracts inherited nested tokens, composes ordered sets, resolves aliases through a guarded graph walk and validates resolved values. Export adapters consume only the selected theme's resolved records and append every unsupported conversion to a loss report.
+
+The `$sets`/`$themes` wrapper is local metadata; W3C-style export emits a plain nested `$type`/`$value` object. All Vite assets are relative for nested portal mounting, and release packaging fixes ordering, permissions and timestamps.

public/docs/PRIVACY-SECURITY.md

@@ -0,0 +1,5 @@
+# Privacy and security
+
+All input stays in memory in the current browser. CSP allows only same-origin connections and the application initiates none. There is no telemetry, storage, account or remote asset.
+
+Parsing is capped at 1 MiB, depth 64, 50,000 JSON values and 10,000 extracted tokens. Aliases are exact path references and cannot execute expressions. CSS/Sass strings, XML and Swift strings are target-escaped; normalized identifier collisions and unsupported composite values are recorded as explicit losses.

public/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="Token Tools"><path fill="#5b4ec4" d="M11 4h30l12 12v44H11z"/><path fill="#fff" opacity=".28" d="M41 4v14h12"/><path fill="none" stroke="#fff" stroke-width="4" stroke-linecap="round" d="M22 27h20M22 35h20M28 21l-3 20M39 21l-3 20"/></svg>

public/manifest.webmanifest

@@ -0,0 +1,18 @@
+{
+  "name": "Token Tools",
+  "short_name": "Tokens",
+  "description": "Edit, validate and export design tokens locally in the browser.",
+  "start_url": "./",
+  "scope": "./",
+  "display": "standalone",
+  "background_color": "#f6f7fb",
+  "theme_color": "#29255f",
+  "icons": [
+    {
+      "src": "./favicon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ]
+}

public/sw.js

@@ -0,0 +1,54 @@
+const CACHE_PREFIX = "token-tools-shell-";
+const CACHE_NAME = CACHE_PREFIX + "0.1.0";
+const CORE = ["./", "./manifest.webmanifest", "./favicon.svg"];
+self.addEventListener("install", (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then(async (cache) => {
+      await cache.addAll(CORE);
+      const html = await (await fetch("./")).text();
+      const assets = [...html.matchAll(/(?:src|href)="(\.\/assets\/[^"]+)"/g)]
+        .map((match) => match[1])
+        .filter(Boolean);
+      await cache.addAll(assets);
+    }),
+  );
+  self.skipWaiting();
+});
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then((keys) =>
+        Promise.all(
+          keys
+            .filter((key) => key.startsWith(CACHE_PREFIX) && key !== CACHE_NAME)
+            .map((key) => caches.delete(key)),
+        ),
+      )
+      .then(() => self.clients.claim()),
+  );
+});
+self.addEventListener("fetch", (event) => {
+  if (event.request.method !== "GET") return;
+  const url = new URL(event.request.url);
+  if (
+    url.origin !== self.location.origin ||
+    !url.pathname.startsWith(new URL(self.registration.scope).pathname)
+  )
+    return;
+  event.respondWith(
+    caches.match(event.request).then(
+      (cached) =>
+        cached ??
+        fetch(event.request).then((response) => {
+          if (response.ok) {
+            const copy = response.clone();
+            void caches
+              .open(CACHE_NAME)
+              .then((cache) => cache.put(event.request, copy));
+          }
+          return response;
+        }),
+    ),
+  );
+});

public/toolbox-app.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.token-tools",
+  "name": "Token Tools",
+  "version": "0.1.0",
+  "description": "Edit, validate and export design tokens locally.",
+  "entry": "./",
+  "icon": "./favicon.svg",
+  "categories": ["design", "developer", "data"],
+  "tags": ["design tokens", "css", "sass", "android", "swift", "themes"],
+  "integration": {
+    "contextVersion": 1,
+    "launchModes": ["navigate", "new-tab"],
+    "embedding": "unsupported"
+  },
+  "requirements": {
+    "secureContext": false,
+    "workers": false,
+    "indexedDb": false,
+    "crossOriginIsolated": false,
+    "topLevelContext": false
+  },
+  "privacy": {
+    "processing": "local",
+    "fileUploads": true,
+    "telemetry": false,
+    "label": "Inputs stay in this browser; nothing is uploaded."
+  },
+  "source": {
+    "repository": "https://git.add-ideas.de/lotobo/token-tools",
+    "license": "GPL-3.0-or-later"
+  },
+  "actions": [
+    {
+      "id": "source",
+      "label": "Source",
+      "url": "https://git.add-ideas.de/lotobo/token-tools"
+    }
+  ]
+}

scripts/generate-toolbox-manifest.mjs

@@ -0,0 +1,33 @@
+import { readFile, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { format } from "prettier";
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const sourcePath = path.join(root, "src/toolbox/manifest.source.json");
+const outputPath = path.join(root, "public/toolbox-app.json");
+const source = JSON.parse(await readFile(sourcePath, "utf8"));
+const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
+const versionSource = await readFile(path.join(root, "src/version.ts"), "utf8");
+const appVersion = /^export const APP_VERSION = "([^"]+)";$/mu.exec(
+  versionSource,
+)?.[1];
+const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
+if (source.version !== pkg.version || appVersion !== pkg.version)
+  throw new Error("Version identity drift");
+if (
+  source.id !== "de.add-ideas." + pkg.name ||
+  source.source?.repository !== repository ||
+  source.source?.license !== "GPL-3.0-or-later"
+)
+  throw new Error("Manifest source identity is invalid");
+const serialized = await format(JSON.stringify(source), {
+  filepath: outputPath,
+});
+if (process.argv.includes("--check")) {
+  if ((await readFile(outputPath, "utf8").catch(() => "")) !== serialized)
+    throw new Error("public/toolbox-app.json is stale");
+  console.log("Toolbox manifest is synchronized");
+} else {
+  await writeFile(outputPath, serialized);
+  console.log("Generated public/toolbox-app.json");
+}

scripts/package-release.mjs

@@ -0,0 +1,165 @@
+#!/usr/bin/env node
+import { createHash } from "node:crypto";
+import { execFile } from "node:child_process";
+import {
+  access,
+  chmod,
+  copyFile,
+  cp,
+  lstat,
+  mkdir,
+  mkdtemp,
+  readFile,
+  readdir,
+  rename,
+  rm,
+  utimes,
+  writeFile,
+} from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { promisify } from "node:util";
+import { fileURLToPath } from "node:url";
+const execute = promisify(execFile);
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
+const argument = (name, fallback) => {
+  const index = process.argv.indexOf(name);
+  return index >= 0 ? process.argv[index + 1] : fallback;
+};
+const output = path.resolve(
+  root,
+  argument("--output", "release/" + pkg.name + "-" + pkg.version + ".zip"),
+);
+const checksumOutput = output + ".sha256";
+const force = process.argv.includes("--force");
+if (
+  path.extname(output).toLowerCase() !== ".zip" ||
+  output === root ||
+  output === path.parse(output).root
+)
+  throw new Error("Unsafe release target");
+const exists = (file) =>
+  access(file).then(
+    () => true,
+    () => false,
+  );
+if (!force && ((await exists(output)) || (await exists(checksumOutput))))
+  throw new Error("Release output exists");
+const input = path.join(root, "dist");
+for (const name of [
+  "index.html",
+  "manifest.webmanifest",
+  "sw.js",
+  "toolbox-app.json",
+  "favicon.svg",
+  "README.md",
+  "CHANGELOG.md",
+  "CONTRIBUTING.md",
+  "LICENSE",
+  "SECURITY.md",
+  "SOURCE.md",
+  "THIRD_PARTY_NOTICES.md",
+  "LICENSES/README.md",
+  "LICENSES/npm-runtime-licenses.txt",
+  "docs/ACCESSIBILITY.md",
+  "docs/ARCHITECTURE.md",
+  "docs/PRIVACY-SECURITY.md",
+]) {
+  const details = await lstat(path.join(input, name)).catch(() => null);
+  if (!details?.isFile() || details.isSymbolicLink())
+    throw new Error("Missing release file: " + name);
+}
+const manifest = JSON.parse(
+  await readFile(path.join(input, "toolbox-app.json"), "utf8"),
+);
+const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
+if (
+  manifest.id !== "de.add-ideas." + pkg.name ||
+  manifest.version !== pkg.version ||
+  manifest.entry !== "./" ||
+  manifest.icon !== "./favicon.svg" ||
+  manifest.source?.repository !== repository
+)
+  throw new Error("Packaged manifest identity is invalid");
+if (
+  /\b(?:src|href)=["']\//iu.test(
+    await readFile(path.join(input, "index.html"), "utf8"),
+  )
+)
+  throw new Error("Root-absolute asset reference");
+async function collect(directory, prefix = "") {
+  const files = [];
+  for (const entry of (await readdir(directory, { withFileTypes: true })).sort(
+    (a, b) => (a.name === b.name ? 0 : a.name < b.name ? -1 : 1),
+  )) {
+    const absolute = path.join(directory, entry.name);
+    const relative = prefix ? prefix + "/" + entry.name : entry.name;
+    if (entry.isSymbolicLink())
+      throw new Error("Symlink in release: " + relative);
+    if (entry.isDirectory()) files.push(...(await collect(absolute, relative)));
+    else if (entry.isFile()) files.push({ absolute, relative });
+    else throw new Error("Unsupported release entry: " + relative);
+  }
+  return files;
+}
+const sourceFiles = await collect(input);
+for (const file of sourceFiles)
+  if (
+    file.relative.endsWith(".map") ||
+    /(?:^|\/)(?:\.env(?:\.|$)|id_rsa|id_ed25519|.*\.pem$|.*\.key$)/iu.test(
+      file.relative,
+    ) ||
+    file.relative.split("/").includes("..")
+  )
+    throw new Error("Forbidden release entry: " + file.relative);
+await mkdir(path.dirname(output), { recursive: true });
+const stagingRoot = await mkdtemp(
+  path.join(os.tmpdir(), pkg.name + "-release-"),
+);
+const publicationRoot = await mkdtemp(
+  path.join(path.dirname(output), "." + pkg.name + "-publish-"),
+);
+const stagedTree = path.join(stagingRoot, "tree");
+const stagedArchive = path.join(stagingRoot, path.basename(output));
+try {
+  await cp(input, stagedTree, { recursive: true });
+  const timestamp = new Date("1980-01-01T00:00:00.000Z");
+  for (const file of await collect(stagedTree)) {
+    await chmod(file.absolute, 0o644);
+    await utimes(file.absolute, timestamp, timestamp);
+  }
+  await execute(
+    "zip",
+    [
+      "-X",
+      "-q",
+      "-9",
+      stagedArchive,
+      ...sourceFiles.map((file) => file.relative),
+    ],
+    {
+      cwd: stagedTree,
+      env: { ...process.env, TZ: "UTC" },
+      maxBuffer: 1024 * 1024,
+    },
+  );
+  const archive = await readFile(stagedArchive);
+  const digest = createHash("sha256").update(archive).digest("hex");
+  const stagedChecksum = stagedArchive + ".sha256";
+  await writeFile(stagedChecksum, digest + "  " + path.basename(output) + "\n");
+  const publicationArchive = path.join(publicationRoot, path.basename(output));
+  const publicationChecksum = publicationArchive + ".sha256";
+  await copyFile(stagedArchive, publicationArchive);
+  await copyFile(stagedChecksum, publicationChecksum);
+  if (force) {
+    await rm(output, { force: true });
+    await rm(checksumOutput, { force: true });
+  }
+  await rename(publicationArchive, output);
+  await rename(publicationChecksum, checksumOutput);
+  console.log("Created " + path.relative(root, output) + "\nSHA-256 " + digest);
+} finally {
+  await rm(stagingRoot, { recursive: true, force: true });
+  await rm(publicationRoot, { recursive: true, force: true });
+}

scripts/prepare-release-files.mjs

@@ -0,0 +1,70 @@
+import { cp, mkdir, readFile, readdir, rm, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const destination = path.join(root, "public");
+for (const name of [
+  "LICENSE",
+  "README.md",
+  "CHANGELOG.md",
+  "CONTRIBUTING.md",
+  "SECURITY.md",
+  "SOURCE.md",
+  "THIRD_PARTY_NOTICES.md",
+]) {
+  await readFile(path.join(root, name));
+  await cp(path.join(root, name), path.join(destination, name));
+}
+for (const directory of ["LICENSES", "docs"]) {
+  const output = path.join(destination, directory);
+  await rm(output, { recursive: true, force: true });
+  await cp(path.join(root, directory), output, { recursive: true });
+}
+const lock = JSON.parse(
+  await readFile(path.join(root, "package-lock.json"), "utf8"),
+);
+const sections = [];
+for (const [location, locked] of Object.entries(lock.packages ?? {}).sort(
+  ([a], [b]) => (a === b ? 0 : a < b ? -1 : 1),
+)) {
+  if (!location.includes("node_modules/") || locked.dev === true) continue;
+  const packageDirectory = path.join(root, location);
+  const details = JSON.parse(
+    await readFile(path.join(packageDirectory, "package.json"), "utf8"),
+  );
+  const candidates = (await readdir(packageDirectory))
+    .filter((name) => /^(?:licen[cs]e|copying|notice)(?:\.|$)/iu.test(name))
+    .sort();
+  const texts = [];
+  for (const candidate of candidates) {
+    try {
+      texts.push(
+        "--- " +
+          candidate +
+          " ---\n" +
+          (await readFile(path.join(packageDirectory, candidate), "utf8")),
+      );
+    } catch {
+      /* directory */
+    }
+  }
+  sections.push(
+    "=".repeat(78) +
+      "\n" +
+      details.name +
+      "@" +
+      details.version +
+      "\nDeclared licence: " +
+      (details.license ?? locked.license ?? "See upstream") +
+      "\n" +
+      "=".repeat(78) +
+      "\n" +
+      (texts.join("\n\n") || "See upstream package metadata."),
+  );
+}
+await mkdir(path.join(destination, "LICENSES"), { recursive: true });
+await writeFile(
+  path.join(destination, "LICENSES/npm-runtime-licenses.txt"),
+  sections.join("\n\n").trimEnd() + "\n",
+);
+console.log("Prepared release documentation");

scripts/serve-test.mjs

@@ -0,0 +1,69 @@
+import { createServer } from "node:http";
+import { readFile, stat } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+const root = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "..",
+  "dist",
+);
+const prefix = "/deep/nested/token/";
+const types = new Map([
+  [".css", "text/css; charset=utf-8"],
+  [".html", "text/html; charset=utf-8"],
+  [".js", "text/javascript; charset=utf-8"],
+  [".json", "application/json; charset=utf-8"],
+  [".webmanifest", "application/manifest+json; charset=utf-8"],
+  [".svg", "image/svg+xml"],
+  [".md", "text/markdown; charset=utf-8"],
+  [".txt", "text/plain; charset=utf-8"],
+  [".wasm", "application/wasm"],
+  [".png", "image/png"],
+  [".jpg", "image/jpeg"],
+  [".webp", "image/webp"],
+]);
+const headers = {
+  "Content-Security-Policy":
+    "default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; media-src 'self' blob:; connect-src 'self'; worker-src 'self' blob:; manifest-src 'self'",
+  "Cross-Origin-Opener-Policy": "same-origin",
+  "Cross-Origin-Resource-Policy": "same-origin",
+  "Permissions-Policy":
+    "camera=(), microphone=(), geolocation=(), usb=(), payment=()",
+  "Referrer-Policy": "no-referrer",
+  "X-Content-Type-Options": "nosniff",
+};
+const server = createServer(async (request, response) => {
+  try {
+    const url = new URL(request.url ?? "/", "http://127.0.0.1");
+    const relative = decodeURIComponent(url.pathname).startsWith(prefix)
+      ? decodeURIComponent(url.pathname).slice(prefix.length)
+      : decodeURIComponent(url.pathname).replace(/^\/+/, "");
+    const normalized = path.posix.normalize(relative || "index.html");
+    if (
+      normalized === ".." ||
+      normalized.startsWith("../") ||
+      path.isAbsolute(normalized)
+    ) {
+      response.writeHead(400).end("Bad request");
+      return;
+    }
+    let file = path.join(root, normalized);
+    if ((await stat(file).catch(() => null))?.isDirectory())
+      file = path.join(file, "index.html");
+    const content = await readFile(file);
+    const cacheControl = normalized.startsWith("assets/")
+      ? "public, max-age=31536000, immutable"
+      : "no-cache";
+    response.writeHead(200, {
+      "Content-Type":
+        types.get(path.extname(file)) ?? "application/octet-stream",
+      "Cache-Control": cacheControl,
+      ...headers,
+    });
+    response.end(content);
+  } catch {
+    response.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
+    response.end("Not found");
+  }
+});
+server.listen(4183, "127.0.0.1", () => console.log("Test server ready"));

src/App.tsx

@@ -0,0 +1,35 @@
+import { lazy, Suspense, useState } from "react";
+import { AppShell } from "@add-ideas/toolbox-shell-react";
+import "@add-ideas/toolbox-shell-react/styles.css";
+import "./styles.css";
+import { ErrorBoundary } from "./components/ErrorBoundary";
+import { HelpDialog } from "./components/HelpDialog";
+import { manifest } from "./toolbox/manifest";
+
+const Workbench = lazy(async () => ({
+  default: (await import("./components/Workbench")).Workbench,
+}));
+
+export function App() {
+  const [helpOpen, setHelpOpen] = useState(false);
+  return (
+    <ErrorBoundary>
+      <AppShell
+        app={manifest}
+        manifestUrl="./toolbox-app.json"
+        helpAction={{ onClick: () => setHelpOpen(true) }}
+      >
+        <Suspense
+          fallback={
+            <p className="loading" role="status">
+              Preparing Token Tools…
+            </p>
+          }
+        >
+          <Workbench />
+        </Suspense>
+      </AppShell>
+      <HelpDialog open={helpOpen} onClose={() => setHelpOpen(false)} />
+    </ErrorBoundary>
+  );
+}

src/components/ErrorBoundary.tsx

@@ -0,0 +1,27 @@
+import { Component, type ErrorInfo, type ReactNode } from "react";
+
+export class ErrorBoundary extends Component<
+  { children: ReactNode },
+  { error?: Error }
+> {
+  state: { error?: Error } = {};
+  static getDerivedStateFromError(error: Error) {
+    return { error };
+  }
+  componentDidCatch(error: Error, info: ErrorInfo) {
+    console.error("Application failure", error, info);
+  }
+  render() {
+    if (this.state.error)
+      return (
+        <main className="fatal">
+          <h1>Token Tools could not continue</h1>
+          <p>{this.state.error.message}</p>
+          <button type="button" onClick={() => location.reload()}>
+            Reload
+          </button>
+        </main>
+      );
+    return this.props.children;
+  }
+}

src/components/HelpDialog.tsx

@@ -0,0 +1,49 @@
+import { useEffect, useRef } from "react";
+
+export function HelpDialog({
+  open,
+  onClose,
+}: {
+  open: boolean;
+  onClose: () => void;
+}) {
+  const dialog = useRef<HTMLDialogElement>(null);
+  useEffect(() => {
+    const node = dialog.current;
+    if (!node) return;
+    if (open && !node.open) node.showModal();
+    if (!open && node.open) node.close();
+  }, [open]);
+  return (
+    <dialog
+      ref={dialog}
+      className="help-dialog"
+      onClose={onClose}
+      onCancel={onClose}
+      aria-labelledby="help-title"
+    >
+      <div className="dialog-heading">
+        <div>
+          <p className="eyebrow">Local-first help</p>
+          <h2 id="help-title">About Token Tools</h2>
+        </div>
+        <button type="button" onClick={onClose} aria-label="Close help">
+          ×
+        </button>
+      </div>
+      <p>
+        Edit nested design tokens, compose token sets into themes, resolve
+        aliases, catch cycles and export platform-specific values.
+      </p>
+      <p>
+        All processing happens in this browser. JSON is inert and bounded to 1
+        MiB, 10,000 values and depth 64.
+      </p>
+      <p>
+        Every export includes an explicit loss report. Always review platform
+        output: Android and Swift cannot represent every composite design token
+        without project-specific code.
+      </p>
+    </dialog>
+  );
+}

src/components/Workbench.tsx

@@ -0,0 +1,522 @@
+import { useMemo, useRef, useState } from "react";
+import { triggerBlobDownload } from "@add-ideas/toolbox-helpers";
+import {
+  deleteToken,
+  exportTokens,
+  MAX_TEXT,
+  parseTokenDocument,
+  resolveTheme,
+  updateToken,
+  type TokenRecord,
+  type TokenType,
+} from "../core/tokens";
+
+const EXAMPLE = `{
+  "$sets": {
+    "core": {
+      "color": {
+        "$type": "color",
+        "brand": { "$value": "#6546d7" },
+        "text": { "$value": "#202332" },
+        "surface": { "$value": "#ffffff" }
+      },
+      "space": {
+        "$type": "dimension",
+        "sm": { "$value": { "value": 8, "unit": "px" } },
+        "md": { "$value": "{space.sm}" }
+      },
+      "heading": {
+        "$type": "typography",
+        "$value": { "fontFamily": ["Inter", "sans-serif"], "fontSize": "24px", "fontWeight": 700, "lineHeight": "32px" }
+      }
+    },
+    "dark": {
+      "color": {
+        "$type": "color",
+        "text": { "$value": "#f4f2ff" },
+        "surface": { "$value": "#171522" }
+      }
+    }
+  },
+  "$themes": {
+    "light": ["core"],
+    "dark": ["core", "dark"]
+  }
+}`;
+
+type ExportFormat = "w3c" | "css" | "sass" | "android" | "swift";
+
+export function Workbench() {
+  const [draft, setDraft] = useState(EXAMPLE);
+  const [documentText, setDocumentText] = useState(EXAMPLE);
+  const [parseError, setParseError] = useState("");
+  const document = useMemo(
+    () => parseTokenDocument(documentText),
+    [documentText],
+  );
+  const [theme, setTheme] = useState("light");
+  const [setName, setSetName] = useState("core");
+  const [selectedPath, setSelectedPath] = useState<string | null>(
+    "color.brand",
+  );
+  const [path, setPath] = useState("color.brand");
+  const [type, setType] = useState<TokenType>("color");
+  const [value, setValue] = useState('"#6546d7"');
+  const [editorError, setEditorError] = useState("");
+  const [format, setFormat] = useState<ExportFormat>("css");
+  const [filter, setFilter] = useState("");
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const resolution = useMemo(
+    () =>
+      resolveTheme(
+        document,
+        document.themes[theme]
+          ? theme
+          : (Object.keys(document.themes)[0] ?? "default"),
+      ),
+    [document, theme],
+  );
+  const exported = useMemo(
+    () => exportTokens(format, resolution.tokens),
+    [format, resolution.tokens],
+  );
+  const visibleTokens = (document.sets[setName] ?? []).filter((token) =>
+    token.path.toLowerCase().includes(filter.toLowerCase()),
+  );
+
+  function applyDocument(): void {
+    try {
+      const parsed = parseTokenDocument(draft);
+      setDocumentText(draft);
+      const nextTheme = parsed.themes[theme]
+        ? theme
+        : (Object.keys(parsed.themes)[0] ?? "default");
+      const nextSet = parsed.sets[setName]
+        ? setName
+        : (Object.keys(parsed.sets)[0] ?? "default");
+      setTheme(nextTheme);
+      setSetName(nextSet);
+      setSelectedPath(null);
+      setParseError("");
+    } catch (caught) {
+      setParseError(caught instanceof Error ? caught.message : String(caught));
+    }
+  }
+
+  function chooseToken(token: TokenRecord): void {
+    setSelectedPath(token.path);
+    setPath(token.path);
+    setType(token.type);
+    setValue(JSON.stringify(token.value, null, 2));
+    setEditorError("");
+  }
+
+  function saveToken(): void {
+    try {
+      let parsedValue: unknown;
+      try {
+        parsedValue = JSON.parse(value) as unknown;
+      } catch {
+        parsedValue = value;
+      }
+      const next = updateToken(
+        document,
+        setName,
+        selectedPath,
+        path.trim(),
+        type,
+        parsedValue,
+      );
+      setDocumentText(next);
+      setDraft(next);
+      setSelectedPath(path.trim());
+      setEditorError("");
+    } catch (caught) {
+      setEditorError(caught instanceof Error ? caught.message : String(caught));
+    }
+  }
+
+  function removeToken(): void {
+    if (!selectedPath) return;
+    try {
+      const next = deleteToken(document, setName, selectedPath);
+      setDocumentText(next);
+      setDraft(next);
+      setSelectedPath(null);
+      setPath("");
+      setValue("");
+      setEditorError("");
+    } catch (caught) {
+      setEditorError(caught instanceof Error ? caught.message : String(caught));
+    }
+  }
+
+  async function importDocument(file: File | undefined): Promise<void> {
+    if (!file) return;
+    try {
+      if (file.size > MAX_TEXT)
+        throw new RangeError("Token documents are limited to 1 MiB.");
+      const text = await file.text();
+      parseTokenDocument(text);
+      setDraft(text);
+      setDocumentText(text);
+      setSelectedPath(null);
+      setParseError("");
+    } catch (caught) {
+      setParseError(caught instanceof Error ? caught.message : String(caught));
+    } finally {
+      if (inputRef.current) inputRef.current.value = "";
+    }
+  }
+
+  return (
+    <main className="workbench">
+      <section className="hero">
+        <div>
+          <p className="eyebrow">Design-system workbench</p>
+          <h1>One token source, honest platform output.</h1>
+          <p>
+            Edit nested sets and themes, resolve aliases and see exactly what
+            each target cannot preserve.
+          </p>
+        </div>
+        <span className="privacy-pill">Local only</span>
+      </section>
+
+      <section className="panel" aria-labelledby="document-title">
+        <div className="panel-heading">
+          <div>
+            <p className="eyebrow">Source of truth</p>
+            <h2 id="document-title">Token document</h2>
+          </div>
+          <span className="count-pill">
+            {Object.values(document.sets).reduce(
+              (sum, tokens) => sum + tokens.length,
+              0,
+            )}{" "}
+            tokens
+          </span>
+        </div>
+        <textarea
+          rows={12}
+          value={draft}
+          spellCheck={false}
+          onChange={(event) => setDraft(event.target.value)}
+          aria-label="Token document JSON"
+        />
+        <div className="button-row">
+          <button
+            type="button"
+            className="primary-button"
+            onClick={applyDocument}
+          >
+            Apply JSON
+          </button>
+          <button type="button" onClick={() => inputRef.current?.click()}>
+            Open JSON file
+          </button>
+          <button
+            type="button"
+            onClick={() =>
+              triggerBlobDownload(
+                new Blob([documentText], { type: "application/json" }),
+                "design-tokens.json",
+              )
+            }
+          >
+            Save source
+          </button>
+          <input
+            ref={inputRef}
+            className="sr-only"
+            type="file"
+            accept="application/json,.json"
+            onChange={(event) => void importDocument(event.target.files?.[0])}
+          />
+        </div>
+        {parseError && (
+          <p className="error" role="alert">
+            {parseError}
+          </p>
+        )}
+      </section>
+
+      <section className="editor-grid">
+        <section className="panel" aria-labelledby="tokens-title">
+          <div className="panel-heading">
+            <div>
+              <p className="eyebrow">Nested editor</p>
+              <h2 id="tokens-title">Tokens</h2>
+            </div>
+            <button
+              type="button"
+              onClick={() => {
+                setSelectedPath(null);
+                setPath("");
+                setType("color");
+                setValue('"#000000"');
+              }}
+            >
+              New token
+            </button>
+          </div>
+          <div className="field-grid">
+            <label>
+              Set
+              <select
+                value={setName}
+                onChange={(event) => {
+                  setSetName(event.target.value);
+                  setSelectedPath(null);
+                }}
+              >
+                {Object.keys(document.sets).map((name) => (
+                  <option key={name}>{name}</option>
+                ))}
+              </select>
+            </label>
+            <label>
+              Filter
+              <input
+                value={filter}
+                onChange={(event) => setFilter(event.target.value)}
+                placeholder="color.brand"
+              />
+            </label>
+          </div>
+          <div className="token-list" role="list">
+            {visibleTokens.map((token) => (
+              <button
+                role="listitem"
+                type="button"
+                className={selectedPath === token.path ? "selected" : ""}
+                key={token.path}
+                onClick={() => chooseToken(token)}
+              >
+                <span>
+                  <strong>{token.path}</strong>
+                  <small>
+                    {token.type}
+                    {typeof token.value === "string" &&
+                    /^\{.+\}$/u.test(token.value)
+                      ? ` · alias ${token.value}`
+                      : ""}
+                  </small>
+                </span>
+                <code>{preview(token.value)}</code>
+              </button>
+            ))}
+          </div>
+        </section>
+
+        <section className="panel" aria-labelledby="edit-title">
+          <div className="panel-heading">
+            <div>
+              <p className="eyebrow">
+                {selectedPath ? "Edit token" : "Add token"}
+              </p>
+              <h2 id="edit-title">Value</h2>
+            </div>
+          </div>
+          <label>
+            Dot path
+            <input
+              value={path}
+              onChange={(event) => setPath(event.target.value)}
+              placeholder="color.brand"
+            />
+          </label>
+          <label>
+            Type
+            <select
+              value={type}
+              onChange={(event) => setType(event.target.value as TokenType)}
+            >
+              {[
+                "color",
+                "dimension",
+                "number",
+                "string",
+                "boolean",
+                "typography",
+                "shadow",
+                "unknown",
+              ].map((name) => (
+                <option key={name}>{name}</option>
+              ))}
+            </select>
+          </label>
+          <label>
+            JSON value or plain text
+            <textarea
+              rows={10}
+              value={value}
+              spellCheck={false}
+              onChange={(event) => setValue(event.target.value)}
+            />
+          </label>
+          <div className="button-row">
+            <button
+              type="button"
+              className="primary-button"
+              onClick={saveToken}
+            >
+              Save token
+            </button>
+            <button
+              type="button"
+              disabled={!selectedPath}
+              onClick={removeToken}
+            >
+              Delete token
+            </button>
+          </div>
+          {editorError && (
+            <p className="error" role="alert">
+              {editorError}
+            </p>
+          )}
+        </section>
+      </section>
+
+      <section className="panel" aria-labelledby="theme-title">
+        <div className="panel-heading">
+          <div>
+            <p className="eyebrow">Alias graph and validation</p>
+            <h2 id="theme-title">Theme preview</h2>
+          </div>
+          <label className="inline-label">
+            Theme
+            <select
+              value={
+                document.themes[theme] ? theme : Object.keys(document.themes)[0]
+              }
+              onChange={(event) => setTheme(event.target.value)}
+            >
+              {Object.keys(document.themes).map((name) => (
+                <option key={name}>{name}</option>
+              ))}
+            </select>
+          </label>
+        </div>
+        <p className="muted">
+          Sets: {(document.themes[theme] ?? []).join(" → ") || "none"}. Later
+          sets override matching paths.
+        </p>
+        {resolution.diagnostics.length > 0 ? (
+          <ul className="diagnostics">
+            {resolution.diagnostics.map((item, index) => (
+              <li className={item.level} key={`${item.path}-${index}`}>
+                <strong>{item.level}</strong>
+                <code>{item.path}</code>
+                <span>{item.message}</span>
+              </li>
+            ))}
+          </ul>
+        ) : (
+          <p className="success">No alias or value errors found.</p>
+        )}
+        <div className="resolved-table" tabIndex={0}>
+          <table>
+            <thead>
+              <tr>
+                <th>Path</th>
+                <th>Type</th>
+                <th>Resolved value</th>
+                <th>Source set</th>
+              </tr>
+            </thead>
+            <tbody>
+              {resolution.tokens.map((token) => (
+                <tr key={token.path}>
+                  <td>
+                    <code>{token.path}</code>
+                  </td>
+                  <td>{token.type}</td>
+                  <td>
+                    <code>{preview(token.resolvedValue)}</code>
+                  </td>
+                  <td>{token.set}</td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      </section>
+
+      <section className="export-grid">
+        <section className="panel" aria-labelledby="export-title">
+          <div className="panel-heading">
+            <div>
+              <p className="eyebrow">Resolved theme</p>
+              <h2 id="export-title">Export</h2>
+            </div>
+            <label className="inline-label">
+              Target
+              <select
+                value={format}
+                onChange={(event) =>
+                  setFormat(event.target.value as ExportFormat)
+                }
+              >
+                <option value="w3c">W3C-style JSON</option>
+                <option value="css">CSS variables</option>
+                <option value="sass">Sass variables</option>
+                <option value="android">Android XML</option>
+                <option value="swift">Swift / UIKit</option>
+              </select>
+            </label>
+          </div>
+          <textarea
+            rows={18}
+            readOnly
+            value={exported.content}
+            aria-label="Export output"
+          />
+          <button
+            type="button"
+            onClick={() =>
+              triggerBlobDownload(
+                new Blob([exported.content], { type: exported.mediaType }),
+                exported.extension,
+              )
+            }
+          >
+            Download {exported.extension}
+          </button>
+        </section>
+        <section className="panel" aria-labelledby="loss-title">
+          <div className="panel-heading">
+            <div>
+              <p className="eyebrow">No silent coercion</p>
+              <h2 id="loss-title">Loss report</h2>
+            </div>
+            <span className="count-pill">{exported.losses.length}</span>
+          </div>
+          {exported.losses.length === 0 ? (
+            <p className="success">
+              This target preserves every emitted token in the supported model.
+            </p>
+          ) : (
+            <ul className="loss-list">
+              {exported.losses.map((loss) => (
+                <li key={loss}>{loss}</li>
+              ))}
+            </ul>
+          )}
+          <p className="muted">
+            A zero-loss report covers this tool's supported token model. It
+            cannot guarantee that downstream frameworks interpret a value
+            identically.
+          </p>
+        </section>
+      </section>
+    </main>
+  );
+}
+
+function preview(value: unknown): string {
+  const output = typeof value === "string" ? value : JSON.stringify(value);
+  return output.length > 100 ? `${output.slice(0, 97)}…` : output;
+}

src/core/tokens.ts

@@ -0,0 +1,895 @@
+import { safeJsonParse, stableStringify } from "@add-ideas/toolbox-helpers";
+
+export const MAX_TEXT = 1_048_576;
+export const MAX_TOKENS = 10_000;
+export type TokenType =
+  | "color"
+  | "dimension"
+  | "number"
+  | "string"
+  | "boolean"
+  | "typography"
+  | "shadow"
+  | "unknown";
+
+export interface TokenRecord {
+  path: string;
+  set: string;
+  type: TokenType;
+  value: unknown;
+  description?: string;
+}
+
+export interface TokenDocument {
+  raw: Record<string, unknown>;
+  sets: Record<string, TokenRecord[]>;
+  themes: Record<string, string[]>;
+  wrapped: boolean;
+}
+
+export interface Diagnostic {
+  level: "error" | "warning";
+  path: string;
+  message: string;
+}
+
+export interface ResolvedToken extends TokenRecord {
+  resolvedValue: unknown;
+  alias?: string;
+}
+
+export interface ExportResult {
+  content: string;
+  mediaType: string;
+  extension: string;
+  losses: string[];
+}
+
+const aliasPattern = /^\{([A-Za-z0-9_.-]+)\}$/u;
+const compareText = (a: string, b: string) => (a === b ? 0 : a < b ? -1 : 1);
+
+export function parseTokenDocument(text: string): TokenDocument {
+  const parsed = safeJsonParse(text, {
+    maxTextChars: MAX_TEXT,
+    maxDepth: 64,
+    maxNodes: 50_000,
+  });
+  if (!parsed || Array.isArray(parsed) || typeof parsed !== "object")
+    throw new TypeError("Token document must be a JSON object.");
+  const raw = parsed as unknown as Record<string, unknown>;
+  if ("$sets" in raw && !isPlainObject(raw.$sets))
+    throw new TypeError("$sets must be an object.");
+  const wrapped = isPlainObject(raw.$sets);
+  if (!wrapped && "$themes" in raw)
+    throw new TypeError("$themes requires a $sets object.");
+  const sourceSets: Record<string, unknown> = wrapped
+    ? (raw.$sets as Record<string, unknown>)
+    : { default: raw };
+  const sets: Record<string, TokenRecord[]> = {};
+  let count = 0;
+  for (const [setName, root] of Object.entries(sourceSets).sort(([a], [b]) =>
+    compareText(a, b),
+  )) {
+    if (!isPlainObject(root))
+      throw new TypeError(`Token set ${setName} must be an object.`);
+    const tokens: TokenRecord[] = [];
+    walk(root, [], setName, undefined, tokens);
+    count += tokens.length;
+    if (count > MAX_TOKENS)
+      throw new RangeError(
+        `Token document exceeds ${MAX_TOKENS.toLocaleString()} tokens.`,
+      );
+    sets[setName] = tokens.sort((a, b) => compareText(a.path, b.path));
+  }
+  const themes: Record<string, string[]> = {};
+  if (wrapped && raw.$themes !== undefined) {
+    if (!isPlainObject(raw.$themes))
+      throw new TypeError("$themes must be an object.");
+    for (const [name, value] of Object.entries(raw.$themes)) {
+      if (
+        !Array.isArray(value) ||
+        value.some((item) => typeof item !== "string")
+      )
+        throw new TypeError(`Theme ${name} must be an array of set names.`);
+      themes[name] = value as string[];
+    }
+  }
+  if (Object.keys(themes).length === 0) themes.default = Object.keys(sets);
+  return { raw, sets, themes, wrapped };
+}
+
+function walk(
+  node: Record<string, unknown>,
+  path: string[],
+  set: string,
+  inheritedType: TokenType | undefined,
+  output: TokenRecord[],
+): void {
+  const rawType = node.$type ?? node.type;
+  const normalizedType = normalizeType(rawType);
+  if (rawType !== undefined && normalizedType === undefined)
+    throw new TypeError(
+      `Unsupported token type ${String(rawType)} at ${path.join(".") || set}.`,
+    );
+  const declaredType = normalizedType ?? inheritedType;
+  if ("$value" in node || "value" in node) {
+    if (path.length === 0)
+      throw new TypeError(`Set ${set} contains a token without a path.`);
+    if ("$value" in node && "value" in node)
+      throw new TypeError(`Token ${path.join(".")} declares two values.`);
+    const children = Object.keys(node).filter(
+      (name) => !name.startsWith("$") && !["type", "value"].includes(name),
+    );
+    if (children.length > 0)
+      throw new TypeError(
+        `Token ${path.join(".")} cannot also contain child ${children[0]}.`,
+      );
+    const value = "$value" in node ? node.$value : node.value;
+    output.push({
+      path: path.join("."),
+      set,
+      type: declaredType ?? inferType(value),
+      value,
+      ...(typeof node.$description === "string"
+        ? { description: node.$description }
+        : {}),
+    });
+    return;
+  }
+  for (const [name, child] of Object.entries(node)) {
+    if (name.startsWith("$")) continue;
+    if (!/^[A-Za-z0-9_-]+$/u.test(name))
+      throw new TypeError(`Invalid token path segment: ${name}`);
+    if (!isPlainObject(child))
+      throw new TypeError(
+        `Token or group ${[...path, name].join(".")} must be an object.`,
+      );
+    walk(child, [...path, name], set, declaredType, output);
+  }
+}
+
+export function resolveTheme(
+  document: TokenDocument,
+  themeName: string,
+): { tokens: ResolvedToken[]; diagnostics: Diagnostic[] } {
+  const diagnostics: Diagnostic[] = [];
+  const setNames = document.themes[themeName];
+  if (!setNames)
+    return {
+      tokens: [],
+      diagnostics: [
+        { level: "error", path: themeName, message: "Unknown theme." },
+      ],
+    };
+  const active = new Map<string, TokenRecord>();
+  for (const setName of setNames) {
+    const set = document.sets[setName];
+    if (!set) {
+      diagnostics.push({
+        level: "error",
+        path: themeName,
+        message: `Theme references missing set ${setName}.`,
+      });
+      continue;
+    }
+    for (const token of set) active.set(token.path, token);
+  }
+  const cache = new Map<string, unknown>();
+  const visiting: string[] = [];
+  const resolve = (path: string): unknown => {
+    if (cache.has(path)) return cache.get(path);
+    const token = active.get(path);
+    if (!token)
+      throw new Error(`Alias target ${path} does not exist in this theme.`);
+    const cycleIndex = visiting.indexOf(path);
+    if (cycleIndex >= 0)
+      throw new Error(
+        `Alias cycle: ${[...visiting.slice(cycleIndex), path].join(" → ")}.`,
+      );
+    visiting.push(path);
+    try {
+      const match =
+        typeof token.value === "string" ? aliasPattern.exec(token.value) : null;
+      const value = match ? resolve(match[1] ?? "") : token.value;
+      cache.set(path, value);
+      return value;
+    } finally {
+      visiting.pop();
+    }
+  };
+  const tokens = [...active.values()]
+    .sort((a, b) => compareText(a.path, b.path))
+    .map((token) => {
+      const alias =
+        typeof token.value === "string"
+          ? aliasPattern.exec(token.value)?.[1]
+          : undefined;
+      try {
+        const resolvedValue = resolve(token.path);
+        diagnostics.push(...validateValue(token, resolvedValue));
+        if (alias) {
+          const target = active.get(alias);
+          if (
+            target &&
+            token.type !== "unknown" &&
+            target.type !== "unknown" &&
+            token.type !== target.type
+          )
+            diagnostics.push({
+              level: "warning",
+              path: token.path,
+              message: `Alias type ${target.type} differs from declared ${token.type}.`,
+            });
+        }
+        return { ...token, resolvedValue, ...(alias ? { alias } : {}) };
+      } catch (caught) {
+        diagnostics.push({
+          level: "error",
+          path: token.path,
+          message: caught instanceof Error ? caught.message : String(caught),
+        });
+        return {
+          ...token,
+          resolvedValue: token.value,
+          ...(alias ? { alias } : {}),
+        };
+      }
+    });
+  return { tokens, diagnostics: dedupe(diagnostics) };
+}
+
+function validateValue(token: TokenRecord, value: unknown): Diagnostic[] {
+  const error = (message: string): Diagnostic[] => [
+    { level: "error", path: token.path, message },
+  ];
+  if (
+    token.type === "color" &&
+    !(
+      typeof value === "string" &&
+      /^#(?:[0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/iu.test(value)
+    )
+  )
+    return error("Color must be a 3, 4, 6 or 8-digit hex value.");
+  if (token.type === "dimension" && !dimension(value))
+    return error(
+      "Dimension must be a number/unit object or CSS-style dimension string.",
+    );
+  if (
+    token.type === "number" &&
+    (typeof value !== "number" || !Number.isFinite(value))
+  )
+    return error("Number token must be finite.");
+  if (token.type === "boolean" && typeof value !== "boolean")
+    return error("Boolean token must be true or false.");
+  if (token.type === "string" && typeof value !== "string")
+    return error("String token must contain text.");
+  if (
+    token.type === "typography" &&
+    (!isPlainObject(value) ||
+      value.fontFamily === undefined ||
+      value.fontSize === undefined)
+  )
+    return error("Typography requires at least fontFamily and fontSize.");
+  if (token.type === "shadow") {
+    const shadows = Array.isArray(value) ? value : [value];
+    if (
+      shadows.some(
+        (shadow) =>
+          !isPlainObject(shadow) ||
+          shadow.color === undefined ||
+          shadow.offsetX === undefined ||
+          shadow.offsetY === undefined ||
+          shadow.blur === undefined,
+      )
+    )
+      return error("Each shadow requires color, offsetX, offsetY and blur.");
+  }
+  return token.type === "unknown"
+    ? [
+        {
+          level: "warning",
+          path: token.path,
+          message:
+            "Unknown type; generic JSON can be preserved but platform output may omit it.",
+        },
+      ]
+    : [];
+}
+
+export function exportTokens(
+  format: "w3c" | "css" | "sass" | "android" | "swift",
+  tokens: readonly ResolvedToken[],
+): ExportResult {
+  const losses: string[] = [];
+  if (format === "w3c") {
+    const root: Record<string, unknown> = {};
+    for (const token of tokens)
+      setNested(root, token.path, {
+        $type: token.type,
+        $value: token.resolvedValue,
+        ...(token.description ? { $description: token.description } : {}),
+      });
+    return {
+      content:
+        stableStringify(root, 2, {
+          maxTextChars: 2_000_000,
+          maxDepth: 64,
+          maxNodes: 50_000,
+        }) + "\n",
+      mediaType: "application/json",
+      extension: "tokens.json",
+      losses,
+    };
+  }
+  if (format === "css" || format === "sass") {
+    const declarations: string[] = [];
+    const identifiers = new Map<string, string>();
+    for (const token of tokens) {
+      const converted = cssValue(token, losses);
+      const name = identifier(token.path);
+      if (
+        converted !== null &&
+        claimIdentifier(identifiers, name, token.path, losses, format)
+      )
+        declarations.push(
+          `${format === "sass" ? "$" : "--"}${name}: ${converted};`,
+        );
+    }
+    const content =
+      format === "css"
+        ? `:root {\n${declarations.map((line) => `  ${line}`).join("\n")}\n}\n`
+        : declarations.join("\n") + "\n";
+    return {
+      content,
+      mediaType: "text/css",
+      extension: format === "css" ? "tokens.css" : "tokens.scss",
+      losses,
+    };
+  }
+  if (format === "android") return androidExport(tokens, losses);
+  return swiftExport(tokens, losses);
+}
+
+function androidExport(
+  tokens: readonly ResolvedToken[],
+  losses: string[],
+): ExportResult {
+  const colors: string[] = [];
+  const dimensions: string[] = [];
+  const strings: string[] = [];
+  const identifiers = new Map<string, string>();
+  for (const token of tokens) {
+    const name = identifier(token.path).replace(/-/gu, "_");
+    if (token.type === "color") {
+      if (
+        typeof token.resolvedValue !== "string" ||
+        !/^#(?:[0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/iu.test(
+          token.resolvedValue,
+        )
+      ) {
+        losses.push(`${token.path}: invalid colour omitted from Android.`);
+        continue;
+      }
+      if (claimIdentifier(identifiers, name, token.path, losses, "Android"))
+        colors.push(
+          `  <color name="${name}">${androidColor(token.resolvedValue)}</color>`,
+        );
+    } else if (token.type === "dimension") {
+      const value = dimensionText(token.resolvedValue);
+      if (!/^-?(?:\d+(?:\.\d+)?|\.\d+)(?:dp|sp|px)$/u.test(value))
+        losses.push(
+          `${token.path}: Android cannot preserve dimension ${value}; use dp, sp or px.`,
+        );
+      else if (
+        claimIdentifier(identifiers, name, token.path, losses, "Android")
+      )
+        dimensions.push(`  <dimen name="${name}">${value}</dimen>`);
+    } else if (["string", "number", "boolean"].includes(token.type)) {
+      if (claimIdentifier(identifiers, name, token.path, losses, "Android"))
+        strings.push(
+          `  <string name="${name}">${escapeXml(String(token.resolvedValue))}</string>`,
+        );
+    } else
+      losses.push(
+        `${token.path}: ${token.type} is omitted; Android composite resources require project-specific styles/drawables.`,
+      );
+  }
+  return {
+    content: `<?xml version="1.0" encoding="utf-8"?>\n<resources>\n${[...colors, ...dimensions, ...strings].join("\n")}\n</resources>\n`,
+    mediaType: "application/xml",
+    extension: "tokens.xml",
+    losses,
+  };
+}
+
+function swiftExport(
+  tokens: readonly ResolvedToken[],
+  losses: string[],
+): ExportResult {
+  const lines = ["import UIKit", "", "enum DesignTokens {"];
+  const identifiers = new Map<string, string>();
+  for (const token of tokens) {
+    const name = swiftIdentifier(token.path);
+    if (token.type === "color") {
+      if (
+        typeof token.resolvedValue !== "string" ||
+        !/^#(?:[0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/iu.test(
+          token.resolvedValue,
+        )
+      ) {
+        losses.push(`${token.path}: invalid colour omitted from Swift.`);
+        continue;
+      }
+      if (claimIdentifier(identifiers, name, token.path, losses, "Swift"))
+        lines.push(`  static let ${name} = ${swiftColor(token.resolvedValue)}`);
+    } else if (token.type === "dimension") {
+      const parsed = dimension(token.resolvedValue);
+      if (!parsed || !["px", "pt"].includes(parsed.unit))
+        losses.push(
+          `${token.path}: Swift CGFloat export accepts only px/pt; semantic units need project context.`,
+        );
+      else if (claimIdentifier(identifiers, name, token.path, losses, "Swift"))
+        lines.push(`  static let ${name}: CGFloat = ${parsed.value}`);
+    } else if (
+      token.type === "number" &&
+      typeof token.resolvedValue === "number" &&
+      Number.isFinite(token.resolvedValue)
+    ) {
+      if (claimIdentifier(identifiers, name, token.path, losses, "Swift"))
+        lines.push(`  static let ${name}: CGFloat = ${token.resolvedValue}`);
+    } else if (token.type === "string") {
+      if (claimIdentifier(identifiers, name, token.path, losses, "Swift"))
+        lines.push(
+          `  static let ${name} = ${swiftString(String(token.resolvedValue))}`,
+        );
+    } else if (token.type === "boolean") {
+      if (claimIdentifier(identifiers, name, token.path, losses, "Swift"))
+        lines.push(
+          `  static let ${name} = ${token.resolvedValue ? "true" : "false"}`,
+        );
+    } else
+      losses.push(
+        `${token.path}: ${token.type} is omitted; UIKit composite construction is project-specific.`,
+      );
+  }
+  lines.push("}");
+  return {
+    content: lines.join("\n") + "\n",
+    mediaType: "text/x-swift",
+    extension: "DesignTokens.swift",
+    losses,
+  };
+}
+
+function cssValue(token: ResolvedToken, losses: string[]): string | null {
+  const value = token.resolvedValue;
+  if (token.type === "color") {
+    if (
+      typeof value === "string" &&
+      /^#(?:[0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/iu.test(value)
+    )
+      return value;
+    losses.push(`${token.path}: invalid colour omitted from CSS/Sass.`);
+    return null;
+  }
+  if (token.type === "string")
+    return cssString(typeof value === "string" ? value : String(value));
+  if (token.type === "number") {
+    if (typeof value === "number" && Number.isFinite(value))
+      return String(value);
+    losses.push(`${token.path}: non-finite or non-numeric value omitted.`);
+    return null;
+  }
+  if (token.type === "boolean") {
+    if (typeof value === "boolean") return String(value);
+    losses.push(`${token.path}: non-boolean value omitted.`);
+    return null;
+  }
+  if (token.type === "dimension") {
+    const parsed = dimension(value);
+    if (parsed) return `${parsed.value}${parsed.unit}`;
+    losses.push(`${token.path}: invalid dimension omitted from CSS/Sass.`);
+    return null;
+  }
+  if (token.type === "typography" && isPlainObject(value)) {
+    const families = Array.isArray(value.fontFamily)
+      ? value.fontFamily
+      : [value.fontFamily];
+    if (
+      families.length === 0 ||
+      families.some((family) => typeof family !== "string")
+    ) {
+      losses.push(`${token.path}: invalid fontFamily; typography omitted.`);
+      return null;
+    }
+    const sizeValue = dimension(value.fontSize);
+    if (!sizeValue) {
+      losses.push(`${token.path}: invalid fontSize; typography omitted.`);
+      return null;
+    }
+    const size = `${sizeValue.value}${sizeValue.unit}`;
+    let line = "normal";
+    if (value.lineHeight !== undefined) {
+      if (
+        typeof value.lineHeight === "number" &&
+        Number.isFinite(value.lineHeight)
+      )
+        line = String(value.lineHeight);
+      else {
+        const parsedLine = dimension(value.lineHeight);
+        if (!parsedLine) {
+          losses.push(`${token.path}: invalid lineHeight; typography omitted.`);
+          return null;
+        }
+        line = `${parsedLine.value}${parsedLine.unit}`;
+      }
+    }
+    const weight = cssFontWeight(value.fontWeight, token.path, losses);
+    const family = families
+      .map((item) => cssFontFamily(item as string))
+      .join(", ");
+    if (value.letterSpacing !== undefined)
+      losses.push(
+        `${token.path}: letterSpacing is not representable inside the emitted font shorthand.`,
+      );
+    return `${weight} ${size}/${line} ${family}`;
+  }
+  if (token.type === "shadow") {
+    const shadows = Array.isArray(value) ? value : [value];
+    const converted: string[] = [];
+    for (const shadow of shadows) {
+      if (!isPlainObject(shadow)) {
+        losses.push(`${token.path}: invalid shadow omitted from CSS/Sass.`);
+        return null;
+      }
+      const dimensions = [
+        dimension(shadow.offsetX),
+        dimension(shadow.offsetY),
+        dimension(shadow.blur),
+        dimension(shadow.spread ?? "0px"),
+      ];
+      if (
+        dimensions.some((part) => !part) ||
+        typeof shadow.color !== "string" ||
+        !/^#(?:[0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/iu.test(
+          shadow.color,
+        )
+      ) {
+        losses.push(`${token.path}: invalid shadow omitted from CSS/Sass.`);
+        return null;
+      }
+      converted.push(
+        `${dimensions.map((part) => `${part!.value}${part!.unit}`).join(" ")} ${shadow.color}`,
+      );
+    }
+    return converted.join(", ");
+  }
+  losses.push(`${token.path}: unknown token type omitted.`);
+  return null;
+}
+
+const CSS_GENERIC_FAMILIES = new Set([
+  "serif",
+  "sans-serif",
+  "monospace",
+  "cursive",
+  "fantasy",
+  "system-ui",
+  "ui-serif",
+  "ui-sans-serif",
+  "ui-monospace",
+  "ui-rounded",
+  "emoji",
+  "math",
+  "fangsong",
+]);
+
+function cssString(value: string): string {
+  let escaped = "";
+  for (const character of value) {
+    const codePoint = character.codePointAt(0) ?? 0;
+    if (character === '"' || character === "\\") escaped += `\\${character}`;
+    else if (codePoint === 0) escaped += "\\fffd ";
+    else if (codePoint < 0x20 || codePoint === 0x7f)
+      escaped += `\\${codePoint.toString(16)} `;
+    else escaped += character;
+  }
+  return `"${escaped}"`;
+}
+
+function cssFontFamily(value: string): string {
+  return CSS_GENERIC_FAMILIES.has(value.toLowerCase())
+    ? value.toLowerCase()
+    : cssString(value);
+}
+
+function cssFontWeight(value: unknown, path: string, losses: string[]): string {
+  if (value === undefined) return "normal";
+  if (
+    (typeof value === "number" &&
+      Number.isFinite(value) &&
+      value >= 1 &&
+      value <= 1000) ||
+    (typeof value === "string" &&
+      /^(?:normal|bold|bolder|lighter|(?:[1-9][0-9]{0,2}|1000))$/u.test(value))
+  )
+    return String(value);
+  losses.push(`${path}: invalid fontWeight replaced with normal.`);
+  return "normal";
+}
+
+export function updateToken(
+  document: TokenDocument,
+  setName: string,
+  oldPath: string | null,
+  path: string,
+  type: TokenType,
+  value: unknown,
+): string {
+  if (!/^[A-Za-z0-9_-]+(?:\.[A-Za-z0-9_-]+)*$/u.test(path))
+    throw new TypeError(
+      "Path must contain dot-separated letters, digits, underscores or hyphens.",
+    );
+  const raw = structuredClone(document.raw);
+  const setRoot = document.wrapped
+    ? ensureObject(ensureObject(raw, "$sets"), setName)
+    : raw;
+  if (oldPath && oldPath !== path) deleteNested(setRoot, oldPath);
+  setEditableToken(
+    setRoot,
+    path,
+    { $type: type, $value: value },
+    oldPath === path,
+  );
+  return stableStringify(raw, 2, {
+    maxTextChars: MAX_TEXT,
+    maxDepth: 64,
+    maxNodes: 50_000,
+  });
+}
+
+export function deleteToken(
+  document: TokenDocument,
+  setName: string,
+  path: string,
+): string {
+  const raw = structuredClone(document.raw);
+  const sets = document.wrapped && isPlainObject(raw.$sets) ? raw.$sets : raw;
+  const setRoot =
+    document.wrapped && isPlainObject(sets[setName]) ? sets[setName] : raw;
+  deleteNested(setRoot as Record<string, unknown>, path);
+  return stableStringify(raw, 2, {
+    maxTextChars: MAX_TEXT,
+    maxDepth: 64,
+    maxNodes: 50_000,
+  });
+}
+
+function inferType(value: unknown): TokenType {
+  if (typeof value === "boolean") return "boolean";
+  if (typeof value === "number") return "number";
+  if (typeof value === "string")
+    return /^#(?:[0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/iu.test(
+      value,
+    )
+      ? "color"
+      : /^-?(?:\d+(?:\.\d+)?|\.\d+)(?:px|rem|em|%|pt|dp|sp)$/u.test(value)
+        ? "dimension"
+        : "string";
+  return "unknown";
+}
+
+function normalizeType(value: unknown): TokenType | undefined {
+  return typeof value === "string" &&
+    [
+      "color",
+      "dimension",
+      "number",
+      "string",
+      "boolean",
+      "typography",
+      "shadow",
+      "unknown",
+    ].includes(value)
+    ? (value as TokenType)
+    : undefined;
+}
+
+function dimension(value: unknown): { value: number; unit: string } | null {
+  if (typeof value === "string") {
+    const match = /^(-?(?:\d+(?:\.\d+)?|\.\d+))(px|rem|em|%|pt|dp|sp)$/u.exec(
+      value,
+    );
+    return match ? { value: Number(match[1]), unit: match[2] ?? "" } : null;
+  }
+  if (
+    isPlainObject(value) &&
+    typeof value.value === "number" &&
+    Number.isFinite(value.value) &&
+    typeof value.unit === "string" &&
+    ["px", "rem", "em", "%", "pt", "dp", "sp"].includes(value.unit)
+  )
+    return { value: value.value, unit: value.unit };
+  return null;
+}
+
+function dimensionText(value: unknown): string {
+  const parsed = dimension(value);
+  if (parsed) return `${parsed.value}${parsed.unit}`;
+  return typeof value === "number" ? String(value) : String(value ?? "0");
+}
+
+function androidColor(value: string): string {
+  const hex = expandHex(value);
+  return hex.length === 8
+    ? `#${hex.slice(6)}${hex.slice(0, 6)}`.toUpperCase()
+    : `#${hex}`.toUpperCase();
+}
+
+function swiftColor(value: string): string {
+  const hex = expandHex(value);
+  const red = Number.parseInt(hex.slice(0, 2), 16) / 255;
+  const green = Number.parseInt(hex.slice(2, 4), 16) / 255;
+  const blue = Number.parseInt(hex.slice(4, 6), 16) / 255;
+  const alpha =
+    hex.length === 8 ? Number.parseInt(hex.slice(6, 8), 16) / 255 : 1;
+  return `UIColor(red: ${red.toFixed(4)}, green: ${green.toFixed(4)}, blue: ${blue.toFixed(4)}, alpha: ${alpha.toFixed(4)})`;
+}
+
+function expandHex(value: string): string {
+  const hex = value.slice(1);
+  return hex.length <= 4 ? [...hex].map((part) => part + part).join("") : hex;
+}
+
+function identifier(path: string): string {
+  const converted = path
+    .replace(/([a-z0-9])([A-Z])/gu, "$1-$2")
+    .replace(/[^A-Za-z0-9_-]+/gu, "-")
+    .toLowerCase();
+  return /^\d/u.test(converted) ? `token-${converted}` : converted;
+}
+
+function swiftIdentifier(path: string): string {
+  const words = path.split(/[^A-Za-z0-9]+/u).filter(Boolean);
+  const joined =
+    (words[0] ?? "token").toLowerCase() +
+    words
+      .slice(1)
+      .map((word) => word[0]?.toUpperCase() + word.slice(1))
+      .join("");
+  return /^\d/u.test(joined) ? `token${joined}` : joined;
+}
+
+function setNested(
+  root: Record<string, unknown>,
+  path: string,
+  value: unknown,
+): void {
+  const parts = path.split(".");
+  let cursor = root;
+  for (const part of parts.slice(0, -1)) cursor = ensureObject(cursor, part);
+  cursor[parts.at(-1) ?? path] = value;
+}
+
+function setEditableToken(
+  root: Record<string, unknown>,
+  path: string,
+  value: unknown,
+  allowReplace: boolean,
+): void {
+  const parts = path.split(".");
+  let cursor = root;
+  const traversed: string[] = [];
+  for (const part of parts.slice(0, -1)) {
+    traversed.push(part);
+    const existing = cursor[part];
+    if (existing === undefined) cursor[part] = {};
+    else if (!isPlainObject(existing))
+      throw new TypeError(
+        `Path ${path} crosses non-object value at ${traversed.join(".")}.`,
+      );
+    else if ("$value" in existing || "value" in existing)
+      throw new TypeError(
+        `Path ${path} crosses existing token ${traversed.join(".")}.`,
+      );
+    cursor = cursor[part] as Record<string, unknown>;
+  }
+  const final = parts.at(-1) ?? path;
+  const existing = cursor[final];
+  if (existing !== undefined && !allowReplace) {
+    if (
+      isPlainObject(existing) &&
+      !("$value" in existing) &&
+      !("value" in existing)
+    )
+      throw new TypeError(`Path ${path} is already an existing token group.`);
+    throw new TypeError(`Token ${path} already exists.`);
+  }
+  cursor[final] = value;
+}
+
+function deleteNested(root: Record<string, unknown>, path: string): void {
+  const parts = path.split(".");
+  const parents: Array<[Record<string, unknown>, string]> = [];
+  let cursor = root;
+  for (const part of parts.slice(0, -1)) {
+    if (!isPlainObject(cursor[part])) return;
+    parents.push([cursor, part]);
+    cursor = cursor[part];
+  }
+  delete cursor[parts.at(-1) ?? path];
+  for (const [parent, key] of parents.reverse())
+    if (isPlainObject(parent[key]) && Object.keys(parent[key]).length === 0)
+      delete parent[key];
+}
+
+function ensureObject(
+  root: Record<string, unknown>,
+  key: string,
+): Record<string, unknown> {
+  if (!isPlainObject(root[key])) root[key] = {};
+  return root[key] as Record<string, unknown>;
+}
+
+function escapeXml(value: string): string {
+  return value
+    .replace(/&/gu, "&amp;")
+    .replace(/</gu, "&lt;")
+    .replace(/>/gu, "&gt;")
+    .replace(/"/gu, "&quot;")
+    .replace(/'/gu, "&apos;");
+}
+
+function swiftString(value: string): string {
+  let result = '"';
+  for (const character of value) {
+    const codePoint = character.codePointAt(0) ?? 0;
+    if (character === '"') result += '\\"';
+    else if (character === "\\") result += "\\\\";
+    else if (character === "\n") result += "\\n";
+    else if (character === "\r") result += "\\r";
+    else if (character === "\t") result += "\\t";
+    else if (codePoint < 0x20 || codePoint === 0x7f)
+      result += `\\u{${codePoint.toString(16)}}`;
+    else result += character;
+  }
+  return `${result}"`;
+}
+
+function claimIdentifier(
+  identifiers: Map<string, string>,
+  identifierValue: string,
+  path: string,
+  losses: string[],
+  target: string,
+): boolean {
+  const existing = identifiers.get(identifierValue);
+  if (existing !== undefined && existing !== path) {
+    losses.push(
+      `${path}: ${target} identifier ${identifierValue} collides with ${existing}; omitted.`,
+    );
+    return false;
+  }
+  identifiers.set(identifierValue, path);
+  return true;
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return (
+    value !== null &&
+    !Array.isArray(value) &&
+    typeof value === "object" &&
+    (Object.getPrototypeOf(value) === Object.prototype ||
+      Object.getPrototypeOf(value) === null)
+  );
+}
+
+function dedupe(items: Diagnostic[]): Diagnostic[] {
+  const seen = new Set<string>();
+  return items.filter((item) => {
+    const key = `${item.level}\0${item.path}\0${item.message}`;
+    if (seen.has(key)) return false;
+    seen.add(key);
+    return true;
+  });
+}

src/main.tsx

@@ -0,0 +1,18 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { App } from "./App";
+
+createRoot(document.getElementById("root")!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);
+
+if ("serviceWorker" in navigator && import.meta.env.PROD) {
+  window.addEventListener("load", () => {
+    const url = new URL("./sw.js", document.baseURI);
+    void navigator.serviceWorker
+      .register(url, { scope: new URL("./", document.baseURI).pathname })
+      .catch(() => undefined);
+  });
+}

src/test/setup.ts

@@ -0,0 +1,8 @@
+import "@testing-library/jest-dom/vitest";
+import { afterEach } from "vitest";
+import { cleanup } from "@testing-library/react";
+
+afterEach(() => {
+  cleanup();
+  localStorage.clear();
+});

src/toolbox/manifest.source.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.token-tools",
+  "name": "Token Tools",
+  "version": "0.1.0",
+  "description": "Edit, validate and export design tokens locally.",
+  "entry": "./",
+  "icon": "./favicon.svg",
+  "categories": ["design", "developer", "data"],
+  "tags": ["design tokens", "css", "sass", "android", "swift", "themes"],
+  "integration": {
+    "contextVersion": 1,
+    "launchModes": ["navigate", "new-tab"],
+    "embedding": "unsupported"
+  },
+  "requirements": {
+    "secureContext": false,
+    "workers": false,
+    "indexedDb": false,
+    "crossOriginIsolated": false,
+    "topLevelContext": false
+  },
+  "privacy": {
+    "processing": "local",
+    "fileUploads": true,
+    "telemetry": false,
+    "label": "Inputs stay in this browser; nothing is uploaded."
+  },
+  "source": {
+    "repository": "https://git.add-ideas.de/lotobo/token-tools",
+    "license": "GPL-3.0-or-later"
+  },
+  "actions": [
+    {
+      "id": "source",
+      "label": "Source",
+      "url": "https://git.add-ideas.de/lotobo/token-tools"
+    }
+  ]
+}

src/toolbox/manifest.ts

@@ -0,0 +1,4 @@
+import { defineToolboxApp, parseToolboxApp } from "@add-ideas/toolbox-contract";
+import source from "./manifest.source.json";
+
+export const manifest = defineToolboxApp(parseToolboxApp(source));

src/version.ts

@@ -0,0 +1 @@
+export const APP_VERSION = "0.1.0";

src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />

tests/browser/app.spec.ts

@@ -0,0 +1,47 @@
+import { expect, test } from "@playwright/test";
+
+for (const path of ["/", "/deep/nested/token/"]) {
+  test(`edits and exports locally at ${path}`, async ({ page }) => {
+    const external: string[] = [];
+    page.on("request", (request) => {
+      if (!request.url().startsWith("http://127.0.0.1:4183"))
+        external.push(request.url());
+    });
+    await page.goto(path);
+    await expect(
+      page.getByRole("heading", {
+        name: "One token source, honest platform output.",
+      }),
+    ).toBeVisible();
+    await expect(page.getByLabel("Export output")).toContainText(
+      "--color-brand",
+    );
+    await page
+      .getByRole("combobox", { name: "Theme", exact: true })
+      .selectOption("dark");
+    await expect(
+      page.locator(".resolved-table tr").filter({ hasText: "color.text" }),
+    ).toContainText("#f4f2ff");
+    expect(external).toEqual([]);
+  });
+}
+
+test("keeps the installed application available offline", async ({
+  page,
+  context,
+}) => {
+  await page.goto("/");
+  await page.evaluate(async () => navigator.serviceWorker.ready);
+  await page.reload();
+  await context.setOffline(true);
+  try {
+    await page.reload();
+    await expect(
+      page.getByRole("heading", {
+        name: "One token source, honest platform output.",
+      }),
+    ).toBeVisible();
+  } finally {
+    await context.setOffline(false);
+  }
+});

tests/components/workbench.test.tsx

@@ -0,0 +1,24 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { describe, expect, it } from "vitest";
+import { Workbench } from "../../src/components/Workbench";
+
+describe("Workbench", () => {
+  it("switches themes and keeps aliases resolved", async () => {
+    const user = userEvent.setup();
+    render(<Workbench />);
+    await user.selectOptions(screen.getByLabelText("Theme"), "dark");
+    expect(screen.getByText("#f4f2ff")).toBeVisible();
+    expect(screen.getByText(/Sets: core → dark/u)).toBeVisible();
+  });
+
+  it("does not replace the active document with invalid JSON", async () => {
+    const user = userEvent.setup();
+    render(<Workbench />);
+    const source = screen.getByLabelText("Token document JSON");
+    fireEvent.change(source, { target: { value: "{" } });
+    await user.click(screen.getByRole("button", { name: "Apply JSON" }));
+    expect(screen.getByRole("alert")).toBeVisible();
+    expect(screen.getAllByText("color.brand").length).toBeGreaterThan(0);
+  });
+});

tests/core/tokens.test.ts

@@ -0,0 +1,136 @@
+import { describe, expect, it } from "vitest";
+import {
+  deleteToken,
+  exportTokens,
+  parseTokenDocument,
+  resolveTheme,
+  updateToken,
+} from "../../src/core/tokens";
+
+const themed = JSON.stringify({
+  $sets: {
+    core: {
+      color: {
+        $type: "color",
+        brand: { $value: "#112233" },
+        link: { $value: "{color.brand}" },
+      },
+      space: { sm: { $type: "dimension", $value: "8px" } },
+    },
+    dark: { color: { $type: "color", brand: { $value: "#ddeeff" } } },
+  },
+  $themes: { light: ["core"], dark: ["core", "dark"] },
+});
+
+describe("token model", () => {
+  it("composes sets and resolves aliases after overrides", () => {
+    const result = resolveTheme(parseTokenDocument(themed), "dark");
+    expect(
+      result.tokens.find((token) => token.path === "color.link")?.resolvedValue,
+    ).toBe("#ddeeff");
+    expect(result.diagnostics).toEqual([]);
+  });
+
+  it("detects cycles and missing aliases", () => {
+    const document = parseTokenDocument(
+      '{"a":{"$value":"{b}"},"b":{"$value":"{a}"},"c":{"$value":"{missing}"}}',
+    );
+    const messages = resolveTheme(document, "default")
+      .diagnostics.map((item) => item.message)
+      .join(" ");
+    expect(messages).toMatch(/cycle/u);
+    expect(messages).toMatch(/does not exist/u);
+  });
+
+  it("rejects malformed wrappers and non-standard hex lengths", () => {
+    expect(() => parseTokenDocument('{"$sets":[]}')).toThrow(
+      /\$sets must be an object/u,
+    );
+    const document = parseTokenDocument(
+      '{"five":{"$type":"color","$value":"#12345"},"seven":{"$type":"color","$value":"#1234567"}}',
+    );
+    expect(resolveTheme(document, "default").diagnostics).toHaveLength(2);
+    expect(() => parseTokenDocument('{"$themes":{}}')).toThrow(
+      /requires a \$sets/u,
+    );
+    expect(() =>
+      parseTokenDocument(
+        '{"leaf":{"$value":"x","hidden":{"$value":"ignored"}}}',
+      ),
+    ).toThrow(/cannot also contain child/u);
+  });
+
+  it("exports CSS and reports platform loss", () => {
+    const tokens = resolveTheme(parseTokenDocument(themed), "light").tokens;
+    expect(exportTokens("css", tokens).content).toContain(
+      "--color-brand: #112233;",
+    );
+    const composite = parseTokenDocument(
+      '{"text":{"$type":"typography","$value":{"fontFamily":"Inter","fontSize":"16px"}}}',
+    );
+    expect(
+      exportTokens("android", resolveTheme(composite, "default").tokens)
+        .losses[0],
+    ).toMatch(/project-specific/u);
+  });
+
+  it("quotes generated strings and typography and reports name collisions", () => {
+    const document = parseTokenDocument(
+      JSON.stringify({
+        danger: { $type: "string", $value: 'x"; } --owned: red; /*' },
+        text: {
+          $type: "typography",
+          $value: {
+            fontFamily: 'Evil"; } body { color: red; /*',
+            fontSize: "16px",
+          },
+        },
+        a: { b: { $type: "string", $value: "first" } },
+        "a-b": { $type: "string", $value: "second" },
+      }),
+    );
+    const result = exportTokens(
+      "css",
+      resolveTheme(document, "default").tokens,
+    );
+    expect(result.content).toContain('--danger: "x\\"; } --owned: red; /*";');
+    expect(result.content).toContain('"Evil\\"; } body { color: red; /*"');
+    expect(result.losses.join(" ")).toMatch(/identifier a-b collides/u);
+  });
+
+  it("edits and deletes nested tokens", () => {
+    const document = parseTokenDocument(themed);
+    const updated = updateToken(
+      document,
+      "core",
+      "space.sm",
+      "space.md",
+      "dimension",
+      "16px",
+    );
+    expect(
+      parseTokenDocument(updated).sets.core?.some(
+        (token) => token.path === "space.md",
+      ),
+    ).toBe(true);
+    const removed = deleteToken(
+      parseTokenDocument(updated),
+      "core",
+      "space.md",
+    );
+    expect(
+      parseTokenDocument(removed).sets.core?.some(
+        (token) => token.path === "space.md",
+      ),
+    ).toBe(false);
+  });
+
+  it("refuses to create a path through an existing token leaf", () => {
+    const document = parseTokenDocument(
+      '{"base":{"$type":"string","$value":"leaf"}}',
+    );
+    expect(() =>
+      updateToken(document, "default", null, "base.child", "string", "x"),
+    ).toThrow(/crosses existing token base/u);
+  });
+});

tsconfig.app.json

@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "types": ["vite/client"],
+    "allowArbitraryExtensions": true,
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "useDefineForClassFields": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true
+  },
+  "include": ["src", "tests"]
+}

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "files": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.node.json"
+    }
+  ]
+}

tsconfig.node.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "types": ["node"],
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true
+  },
+  "include": [
+    "vite.config.ts",
+    "playwright.config.ts",
+    "eslint.config.mjs",
+    "scripts/**/*.mjs"
+  ]
+}

vite.config.ts

@@ -0,0 +1,16 @@
+/// <reference types="vitest/config" />
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  base: "./",
+  plugins: [react()],
+  test: {
+    environment: "jsdom",
+    setupFiles: "./src/test/setup.ts",
+    css: true,
+    maxWorkers: 2,
+    restoreMocks: true,
+    exclude: ["tests/browser/**", "node_modules/**", "dist/**"],
+  },
+});