build: reject duplicate generated translations

webui/scripts/i18n-catalog-validation.mjs

@@ -0,0 +1,69 @@
+import ts from "typescript";
+
+export function findDuplicateTranslationKeys(sourceText, fileName = "generatedTranslations.ts") {
+  const source = ts.createSourceFile(
+    fileName,
+    sourceText,
+    ts.ScriptTarget.Latest,
+    true,
+    ts.ScriptKind.TS
+  );
+  const findings = [];
+
+  function visit(node) {
+    if (
+      ts.isVariableDeclaration(node) &&
+      ts.isIdentifier(node.name) &&
+      node.name.text === "generatedTranslations" &&
+      node.initializer &&
+      ts.isObjectLiteralExpression(node.initializer)
+    ) {
+      scanCatalog(node.initializer);
+    }
+    ts.forEachChild(node, visit);
+  }
+
+  function scanCatalog(catalog) {
+    for (const localeProperty of catalog.properties) {
+      if (!ts.isPropertyAssignment(localeProperty) || !ts.isObjectLiteralExpression(localeProperty.initializer)) {
+        continue;
+      }
+      const locale = propertyName(localeProperty.name);
+      const firstDeclarations = new Map();
+      for (const translationProperty of localeProperty.initializer.properties) {
+        if (!ts.isPropertyAssignment(translationProperty)) continue;
+        const key = propertyName(translationProperty.name);
+        if (!key) continue;
+        const first = firstDeclarations.get(key);
+        if (!first) {
+          firstDeclarations.set(key, translationProperty.name);
+          continue;
+        }
+        const duplicatePosition = source.getLineAndCharacterOfPosition(
+          translationProperty.name.getStart(source)
+        );
+        const firstPosition = source.getLineAndCharacterOfPosition(first.getStart(source));
+        findings.push(
+          `${fileName}:${duplicatePosition.line + 1}:${duplicatePosition.character + 1} ` +
+          `duplicate generated translation key ${JSON.stringify(key)} in locale ` +
+          `${JSON.stringify(locale)}; first declared at line ${firstPosition.line + 1}`
+        );
+      }
+    }
+  }
+
+  visit(source);
+  return findings;
+}
+
+function propertyName(name) {
+  if (
+    ts.isIdentifier(name) ||
+    ts.isStringLiteral(name) ||
+    ts.isNumericLiteral(name) ||
+    ts.isNoSubstitutionTemplateLiteral(name)
+  ) {
+    return name.text;
+  }
+  return "";
+}