Theming: high-contrast token consolidation

.changeset/kind-colors-share.md

@@ -0,0 +1,6 @@
+---
+"@fluentui-react-native/design": patch
+"@fluentui-react-native/theme-tokens": patch
+---
+
+Share high-contrast alias token processing across Windows platforms from the design package and expose it through the theme-tokens compatibility shim.

.changeset/warm-themes-reuse.md

@@ -0,0 +1,5 @@
+---
+"@fluentui-react-native/win32-theme": patch
+---
+
+Reuse high-contrast alias tokens from `@fluentui-react-native/design/tokens/legacy`.

apps/bundle-size/package.json

@@ -34,6 +34,7 @@
     "@rnx-kit/metro-config": "catalog:",
     "@rnx-kit/metro-resolver-symlinks": "catalog:",
     "@rnx-kit/metro-serializer-esbuild": "catalog:",
+    "@rnx-kit/tools-filesystem": "^0.2.0",
     "metro": "^0.83.1",
     "oxc-resolver": "catalog:"
   },

apps/bundle-size/scripts/measure.mjs

@@ -1,3 +1,4 @@
+import { readJSONFileSync, writeJSONFileSync } from '@rnx-kit/tools-filesystem';
 import { spawnSync } from 'node:child_process';
 import { existsSync, mkdirSync, readFileSync, statSync, writeFileSync } from 'node:fs';
 import { mkdir } from 'node:fs/promises';
@@ -7,7 +8,7 @@ import { gzipSync } from 'node:zlib';
 
 const workspaceRoot = dirname(dirname(fileURLToPath(import.meta.url)));
 const repositoryRoot = dirname(dirname(workspaceRoot));
-const yarnVersion = JSON.parse(readFileSync(join(repositoryRoot, 'package.json'), 'utf8')).packageManager.split('@')[1];
+const yarnVersion = readJSONFileSync(join(repositoryRoot, 'package.json')).packageManager.split('@')[1];
 const yarnPath = join(repositoryRoot, '.yarn', 'releases', `yarn-${yarnVersion}.cjs`);
 const configPath = join(workspaceRoot, 'scenarios.json');
 const defaultBaselinePath = join(workspaceRoot, 'baseline.json');
@@ -68,7 +69,7 @@ function getWorkspacePackage(source) {
   while (directory.startsWith(packagesRoot)) {
     const manifestPath = join(directory, 'package.json');
     if (existsSync(manifestPath)) {
-      return JSON.parse(readFileSync(manifestPath, 'utf8')).name;
+      return readJSONFileSync(manifestPath).name;
     }
     directory = dirname(directory);
   }
@@ -153,8 +154,8 @@ function runBundle(platform, scenario, resetCache) {
   }
 
   const bundle = readFileSync(bundlePath);
-  const sourceMap = JSON.parse(readFileSync(sourceMapPath, 'utf8'));
-  const metafile = JSON.parse(readFileSync(metafilePath, 'utf8'));
+  const sourceMap = readJSONFileSync(sourceMapPath);
+  const metafile = readJSONFileSync(metafilePath);
   const contributions = getWorkspaceContributions(metafile);
 
   return {
@@ -263,7 +264,7 @@ const {
 if (updateBaseline && selectedPlatforms) {
   throw new Error('Baseline updates must include every configured platform; omit --platform');
 }
-const selectedConfig = JSON.parse(readFileSync(selectedConfigPath, 'utf8'));
+const selectedConfig = readJSONFileSync(selectedConfigPath);
 const platforms = selectedPlatforms ?? selectedConfig.platforms;
 
 await mkdir(entryRoot, { recursive: true });
@@ -284,12 +285,10 @@ const currentBaseline = {
   results: measurements.map(baselineResult),
 };
 if (updateBaseline) {
-  writeFileSync(selectedBaselinePath, `${JSON.stringify(currentBaseline, null, 2)}\n`);
+  writeJSONFileSync(selectedBaselinePath, currentBaseline);
 }
 
-const baseline = existsSync(selectedBaselinePath)
-  ? JSON.parse(readFileSync(selectedBaselinePath, 'utf8'))
-  : { schemaVersion: 1, results: [] };
+const baseline = existsSync(selectedBaselinePath) ? readJSONFileSync(selectedBaselinePath) : { schemaVersion: 1, results: [] };
 if (baseline.schemaVersion !== 1) {
   throw new Error(`Unsupported baseline schema version: ${baseline.schemaVersion}`);
 }
@@ -315,7 +314,7 @@ const report = {
 };
 const reportPath = join(outputRoot, 'results.json');
 const markdownReportPath = join(outputRoot, 'report.md');
-writeFileSync(reportPath, `${JSON.stringify(report, null, 2)}\n`);
+writeJSONFileSync(reportPath, report);
 writeFileSync(markdownReportPath, createMarkdownReport(results));
 
 console.table(results);

packages/agentic/design/src/tokens/legacy/highContrast/__tests__/processAliasTokens.test.ts

@@ -0,0 +1,27 @@
+import { processAliasTokens, transformWin32PlatformColorName, transformWindowsPlatformColorName } from '../processAliasTokens';
+
+jest.mock('react-native', () => ({
+  PlatformColor: (color: string) => `PlatformColor('${color}')`,
+}));
+
+const createAliasTokens = () => ({
+  colors: {
+    buttonFace: 'PlatformColor(ButtonFace)',
+  },
+});
+
+it('maps Windows platform colors to SystemColor names', () => {
+  expect(processAliasTokens(createAliasTokens(), transformWindowsPlatformColorName)).toEqual({
+    colors: {
+      buttonFace: "PlatformColor('SystemColorButtonFaceColor')",
+    },
+  });
+});
+
+it('preserves raw Win32 platform color names', () => {
+  expect(processAliasTokens(createAliasTokens(), transformWin32PlatformColorName)).toEqual({
+    colors: {
+      buttonFace: "PlatformColor('ButtonFace')",
+    },
+  });
+});

packages/agentic/design/src/tokens/legacy/highContrast/processAliasTokens.ts

@@ -0,0 +1,24 @@
+import { PlatformColor } from 'react-native';
+
+type AliasTokens = Record<string, Record<string, unknown>>;
+type PlatformColorNameTransform = (color: string) => string;
+
+export const transformWindowsPlatformColorName: PlatformColorNameTransform = (color) => `SystemColor${color}Color`;
+export const transformWin32PlatformColorName: PlatformColorNameTransform = (color) => color;
+
+export function processAliasTokens<T extends AliasTokens>(aliasTokens: T, transformColorName: PlatformColorNameTransform): T {
+  // The imported token JSON is intentionally mutated once when its module loads.
+  for (const key in aliasTokens) {
+    const tokenGroup: Record<string, unknown> = aliasTokens[key];
+    for (const innerKey in tokenGroup) {
+      const entry = tokenGroup[innerKey];
+      if (typeof entry === 'string' && entry.includes('PlatformColor')) {
+        const color = transformColorName(entry.substring(14, entry.length - 1));
+        // eslint-disable-next-line @react-native/platform-colors
+        tokenGroup[innerKey] = PlatformColor(color);
+      }
+    }
+  }
+
+  return aliasTokens;
+}

packages/agentic/design/src/tokens/legacy/highContrast/tokens-alias.ts

@@ -1,20 +1,5 @@
-import { PlatformColor } from 'react-native';
-
 import aliasTokens from '@fluentui-react-native/design-tokens-win32/hc/tokens-aliases.json';
 
-export const hcAliasTokens = processAliasTokens(aliasTokens);
-
-function processAliasTokens(aliasTokens: any) {
-  for (const key in aliasTokens) {
-    for (const innerKey in aliasTokens[key]) {
-      const entry = aliasTokens[key][innerKey];
-      if (typeof entry === 'string' && entry.includes('PlatformColor')) {
-        const color = 'SystemColor' + entry.substring(14, entry.length - 1) + 'Color';
-        // eslint-disable-next-line @react-native/platform-colors
-        aliasTokens[key][innerKey] = PlatformColor(color);
-      }
-    }
-  }
+import { processAliasTokens, transformWindowsPlatformColorName } from './processAliasTokens';
 
-  return aliasTokens;
-}
+export const hcAliasTokens = processAliasTokens(aliasTokens, transformWindowsPlatformColorName);

packages/agentic/design/src/tokens/legacy/highContrast/tokens-alias.win32.ts

@@ -1,20 +1,5 @@
-import { PlatformColor } from 'react-native';
-
 import aliasTokens from '@fluentui-react-native/design-tokens-win32/hc/tokens-aliases.json';
 
-export const hcAliasTokens = processAliasTokens(aliasTokens);
-
-function processAliasTokens(aliasTokens: any) {
-  for (const key in aliasTokens) {
-    for (const innerKey in aliasTokens[key]) {
-      const entry = aliasTokens[key][innerKey];
-      if (typeof entry === 'string' && entry.includes('PlatformColor')) {
-        const color = entry.substring(14, entry.length - 1);
-        // eslint-disable-next-line @react-native/platform-colors
-        aliasTokens[key][innerKey] = PlatformColor(color);
-      }
-    }
-  }
+import { processAliasTokens, transformWin32PlatformColorName } from './processAliasTokens';
 
-  return aliasTokens;
-}
+export const hcAliasTokens = processAliasTokens(aliasTokens, transformWin32PlatformColorName);

packages/agentic/design/src/tokens/legacy/index.ts

@@ -1,2 +1,3 @@
 export { default as globalTokens } from './tokens-global';
 export { getAliasTokens, getShadowTokens } from './getTokens';
+export { hcAliasTokens } from './highContrast/tokens-alias';

packages/shim/theme-tokens/README.md

@@ -1,7 +1,8 @@
 # Theme-tokens
 
-> **Deprecated:** Import `globalTokens`, `getAliasTokens`, and `getShadowTokens`
-> from `@fluentui-react-native/design/tokens/legacy` instead.
+> **Deprecated:** Import `globalTokens`, `getAliasTokens`, `getShadowTokens`,
+> and `hcAliasTokens` from `@fluentui-react-native/design/tokens/legacy`
+> instead.
 
 This package is a compatibility shim and will not receive new APIs. It preserves
 the existing entry point while consumers migrate to the design package.

packages/shim/theme-tokens/src/index.ts

@@ -1,4 +1,4 @@
 // This package is a compatibility shim. Legacy Fluent token values now live in
 // the `@fluentui-react-native/design/tokens/legacy` submodule. These explicit
 // re-exports preserve the existing `@fluentui-react-native/theme-tokens` entry point.
-export { getAliasTokens, getShadowTokens, globalTokens } from '@fluentui-react-native/design/tokens/legacy';
+export { getAliasTokens, getShadowTokens, globalTokens, hcAliasTokens } from '@fluentui-react-native/design/tokens/legacy';

packages/theming/win32-theme/src/getOfficeTokens.ts

@@ -5,8 +5,7 @@ import colorfulShadowTokens from '@fluentui-react-native/design-tokens-win32/col
 import darkGrayAliasTokens from '@fluentui-react-native/design-tokens-win32/darkgray/tokens-aliases.json';
 import darkGrayShadowTokens from '@fluentui-react-native/design-tokens-win32/darkgray/tokens-shadow.json';
 import hcShadowTokens from '@fluentui-react-native/design-tokens-win32/hc/tokens-shadow.json';
-
-import { hcAliasTokens } from './highContrast/tokens-alias';
+import { hcAliasTokens } from '@fluentui-react-native/design/tokens/legacy';
 
 export function getOfficeAliasTokens(officeTheme: string) {
   if (officeTheme === 'White' || officeTheme === 'Colorful') {

yarn.lock

@@ -2652,6 +2652,7 @@ __metadata:
     "@rnx-kit/metro-config": "catalog:"
     "@rnx-kit/metro-resolver-symlinks": "catalog:"
     "@rnx-kit/metro-serializer-esbuild": "catalog:"
+    "@rnx-kit/tools-filesystem": "npm:^0.2.0"
     "@types/react": "npm:~19.1.4"
     metro: "npm:^0.83.1"
     oxc-resolver: "catalog:"