diff --git a/.attw.json b/.attw.json
new file mode 100644
index 0000000000..b36f7e5d31
--- /dev/null
+++ b/.attw.json
@@ -0,0 +1,4 @@
+{
+  "profile": "esm-only",
+  "ignoreRules": ["internal-resolution-error", "cjs-resolves-to-esm"]
+}
diff --git a/.github/scripts/attw/.yarnrc.yml b/.github/scripts/attw/.yarnrc.yml
new file mode 100644
index 0000000000..1e931d38d2
--- /dev/null
+++ b/.github/scripts/attw/.yarnrc.yml
@@ -0,0 +1,3 @@
+yarnPath: ../../../.yarn/releases/yarn-4.14.1.cjs
+
+npmMinimalAgeGate: 7d
diff --git a/.github/scripts/attw/package.json b/.github/scripts/attw/package.json
new file mode 100644
index 0000000000..2cba33d373
--- /dev/null
+++ b/.github/scripts/attw/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "attw-check",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "check": "tsx src/index.ts"
+  },
+  "dependencies": {
+    "@arethetypeswrong/cli": "^0.18.4"
+  },
+  "devDependencies": {
+    "tsx": "^4.21.0",
+    "typescript": "^6.0.3"
+  },
+  "packageManager": "yarn@4.14.1"
+}
diff --git a/.github/scripts/attw/src/index.ts b/.github/scripts/attw/src/index.ts
new file mode 100644
index 0000000000..6febc19d5e
--- /dev/null
+++ b/.github/scripts/attw/src/index.ts
@@ -0,0 +1,420 @@
+/**
+ * Validate published package types with @arethetypeswrong/cli (attw).
+ *
+ * Usage (from repo root):
+ *   yarn attw:check
+ *
+ * Scope is defined in okf-bundle/testing/architecture-decisions.md (Types-AD-1..4)
+ * and repo-root .attw.json (profile esm-only + ignored rules).
+ *
+ * Also smoke-tests Expo config plugins the way Expo prebuild loads them:
+ *   app.plugin.js -> require('./plugin/build/app.plugin') under Node CJS with peers installed.
+ *
+ * All child processes use spawnSync with argument arrays (no shell) to avoid
+ * cross-platform command-parsing issues.
+ *
+ * Exit codes:
+ *   0 — all checks pass
+ *   1 — attw failures and/or Expo plugin smoke failures
+ */
+
+import { spawnSync } from 'node:child_process';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+
+const repoRoot = path.resolve(__dirname, '../../../..');
+const packagesDir = path.join(repoRoot, 'packages');
+const attwBin = path.join(__dirname, '../node_modules/.bin/attw');
+const attwConfigPath = path.join(repoRoot, '.attw.json');
+
+const EXPO_PLUGIN_PACKAGES = [
+  'app',
+  'analytics',
+  'auth',
+  'messaging',
+  'crashlytics',
+  'perf',
+  'app-check',
+  'app-distribution',
+] as const;
+
+type AttwConfig = {
+  profile?: 'strict' | 'node16' | 'esm-only';
+  ignoreRules?: string[];
+};
+
+type AttwProblem = {
+  kind: string;
+  entrypoint?: string;
+  resolutionKind?: string;
+  resolutionOption?: string;
+  moduleSpecifier?: string;
+  fileName?: string;
+  message?: string;
+};
+
+type AttwAnalysis = {
+  packageName?: string;
+  problems?: AttwProblem[];
+  entrypoints?: Record<
+    string,
+    {
+      resolutions?: Record<
+        string,
+        {
+          visibleProblems?: number[];
+        }
+      >;
+    }
+  >;
+};
+
+type AttwResult = {
+  analysis?: AttwAnalysis;
+  problems?: Record<string, AttwProblem[]>;
+};
+
+type IssueRow = {
+  package: string;
+  entrypoint: string;
+  resolution: string;
+  problem: string;
+  detail: string;
+};
+
+type ExpoPluginFailure = {
+  package: string;
+  detail: string;
+};
+
+type AttwRunResult = {
+  passed: boolean;
+  issues: IssueRow[];
+};
+
+const PROBLEM_KIND_TO_IGNORE_RULE: Record<string, string> = {
+  NoResolution: 'no-resolution',
+  UntypedResolution: 'untyped-resolution',
+  FalseCJS: 'false-cjs',
+  FalseESM: 'false-esm',
+  CJSResolvesToESM: 'cjs-resolves-to-esm',
+  FallbackCondition: 'fallback-condition',
+  CJSOnlyExportsDefault: 'cjs-only-exports-default',
+  NamedExports: 'named-exports',
+  FalseExportDefault: 'false-export-default',
+  MissingExportEquals: 'missing-export-equals',
+  UnexpectedModuleSyntax: 'unexpected-module-syntax',
+  InternalResolutionError: 'internal-resolution-error',
+};
+
+const PROFILE_SKIPPED_RESOLUTIONS: Record<NonNullable<AttwConfig['profile']>, string[]> = {
+  strict: [],
+  node16: ['node10'],
+  'esm-only': ['node10', 'node16-cjs'],
+};
+
+function readAttwConfig(): AttwConfig {
+  return JSON.parse(fs.readFileSync(attwConfigPath, 'utf8')) as AttwConfig;
+}
+
+function listPublishedPackages(): string[] {
+  return fs
+    .readdirSync(packagesDir)
+    .filter(dir => {
+      const pkgJsonPath = path.join(packagesDir, dir, 'package.json');
+      if (!fs.existsSync(pkgJsonPath)) {
+        return false;
+      }
+      try {
+        // Skip packages that are not published to npm (private: true).
+        return JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8')).private !== true;
+      } catch {
+        return false;
+      }
+    })
+    .sort();
+}
+
+function runAttw(packageDir: string, dirName: string, config: AttwConfig): AttwRunResult {
+  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'attw-'));
+  const tgz = path.join(tmpDir, `${dirName}.tgz`);
+  const jsonFile = path.join(tmpDir, `${dirName}.json`);
+
+  const pack = spawnSync('yarn', ['pack', '--out', tgz], {
+    cwd: packageDir,
+    encoding: 'utf8',
+    stdio: ['ignore', 'pipe', 'pipe'],
+  });
+  if (pack.status !== 0) {
+    throw new Error(`yarn pack failed for ${dirName}: ${pack.stderr || pack.stdout}`);
+  }
+
+  // Redirect attw's stdout straight to a file descriptor. This guarantees the
+  // full JSON report is captured regardless of size (no stdout maxBuffer
+  // truncation) while still avoiding a shell.
+  const outFd = fs.openSync(jsonFile, 'w');
+  let exitCode = 0;
+  try {
+    const result = spawnSync(
+      attwBin,
+      ['--config-path', attwConfigPath, '--format', 'json', '--no-color', '--no-emoji', tgz],
+      { cwd: tmpDir, stdio: ['ignore', outFd, 'pipe'] },
+    );
+    // attw exits non-zero when it finds problems; the JSON report is still written.
+    exitCode = result.status ?? 1;
+  } finally {
+    fs.closeSync(outFd);
+  }
+
+  if (!fs.existsSync(jsonFile) || !fs.readFileSync(jsonFile, 'utf8').trim()) {
+    throw new Error(`attw produced no output for ${dirName}`);
+  }
+
+  const data = JSON.parse(fs.readFileSync(jsonFile, 'utf8')) as AttwResult;
+
+  try {
+    fs.unlinkSync(tgz);
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  } catch {
+    // ignore cleanup errors
+  }
+
+  return {
+    passed: exitCode === 0,
+    issues: exitCode === 0 ? [] : extractEnforcedIssues(data, config),
+  };
+}
+
+function extractEnforcedIssues(data: AttwResult, config: AttwConfig): IssueRow[] {
+  const analysis = data.analysis;
+  if (!analysis?.problems || !analysis.entrypoints) {
+    return extractLegacyIssues(data);
+  }
+
+  const profile = config.profile || 'strict';
+  const skippedResolutions = new Set(PROFILE_SKIPPED_RESOLUTIONS[profile]);
+  const ignoredRules = new Set(config.ignoreRules || []);
+  const packageName = analysis.packageName || 'unknown';
+  const seen = new Set<number>();
+  const rows: IssueRow[] = [];
+
+  for (const [entrypoint, entrypointInfo] of Object.entries(analysis.entrypoints)) {
+    for (const [resolutionKind, resolution] of Object.entries(entrypointInfo.resolutions || {})) {
+      if (skippedResolutions.has(resolutionKind)) {
+        continue;
+      }
+
+      for (const problemIndex of resolution.visibleProblems || []) {
+        if (seen.has(problemIndex)) {
+          continue;
+        }
+
+        const problem = analysis.problems[problemIndex];
+        if (!problem) {
+          continue;
+        }
+
+        const ignoreRule = PROBLEM_KIND_TO_IGNORE_RULE[problem.kind];
+        if (ignoreRule && ignoredRules.has(ignoreRule)) {
+          continue;
+        }
+
+        seen.add(problemIndex);
+        rows.push({
+          package: packageName,
+          entrypoint: problem.entrypoint || entrypoint,
+          resolution: problem.resolutionKind || resolutionKind,
+          problem: problem.kind,
+          detail: problem.moduleSpecifier || problem.message || problem.fileName || '',
+        });
+      }
+    }
+  }
+
+  return rows;
+}
+
+function extractLegacyIssues(data: AttwResult): IssueRow[] {
+  const rows: IssueRow[] = [];
+  if (!data.problems) {
+    return rows;
+  }
+
+  const packageName = data.analysis?.packageName || 'unknown';
+  for (const [kind, items] of Object.entries(data.problems)) {
+    for (const item of items) {
+      rows.push({
+        package: packageName,
+        entrypoint: item.entrypoint || item.fileName || '.',
+        resolution: item.resolutionKind || item.resolutionOption || '',
+        problem: kind,
+        detail: item.moduleSpecifier || item.message || '',
+      });
+    }
+  }
+  return rows;
+}
+
+function packPackage(packageDir: string, outputPath: string): void {
+  const pack = spawnSync('yarn', ['pack', '--out', outputPath], {
+    cwd: packageDir,
+    encoding: 'utf8',
+    stdio: ['ignore', 'pipe', 'pipe'],
+  });
+  if (pack.status !== 0) {
+    throw new Error(`yarn pack failed: ${pack.stderr || pack.stdout}`);
+  }
+}
+
+function checkExpoPlugins(): ExpoPluginFailure[] {
+  const failures: ExpoPluginFailure[] = [];
+  const tmpRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'rnfb-expo-plugin-'));
+  const appTgz = path.join(tmpRoot, 'app.tgz');
+
+  try {
+    packPackage(path.join(packagesDir, 'app'), appTgz);
+
+    for (const dir of EXPO_PLUGIN_PACKAGES) {
+      const packageDir = path.join(packagesDir, dir);
+      const pkgJsonPath = path.join(packageDir, 'package.json');
+      const pluginEntry = path.join(packageDir, 'app.plugin.js');
+      const pluginBuild = path.join(packageDir, 'plugin/build/app.plugin.js');
+
+      if (!fs.existsSync(pluginEntry)) {
+        continue;
+      }
+
+      if (!fs.existsSync(pluginBuild)) {
+        failures.push({
+          package: JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8')).name,
+          detail: 'plugin/build/app.plugin.js missing — run build:plugin',
+        });
+        continue;
+      }
+
+      const pkgTgz = path.join(tmpRoot, `${dir}.tgz`);
+      const installDir = path.join(tmpRoot, `install-${dir}`);
+      packPackage(packageDir, pkgTgz);
+
+      fs.mkdirSync(installDir, { recursive: true });
+      const init = spawnSync('npm', ['init', '-y'], { cwd: installDir, stdio: 'ignore' });
+      if (init.status !== 0) {
+        failures.push({
+          package: JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8')).name,
+          detail: 'npm init failed',
+        });
+        continue;
+      }
+
+      // @expo/config-plugins is intentionally unpinned so the smoke test tracks
+      // the latest release — Expo consumers upgrade quickly, and this surfaces
+      // breaking changes in new versions early rather than hiding them behind a pin.
+      const install = spawnSync(
+        'npm',
+        ['install', '--silent', '--no-fund', '--no-audit', appTgz, pkgTgz, '@expo/config-plugins'],
+        { cwd: installDir, encoding: 'utf8', stdio: ['ignore', 'pipe', 'pipe'] },
+      );
+      if (install.status !== 0) {
+        failures.push({
+          package: JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8')).name,
+          detail: `npm install failed: ${install.stderr || install.stdout || 'unknown error'}`,
+        });
+        continue;
+      }
+
+      const pkgName = JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8')).name as string;
+      const requireCheck = spawnSync(
+        'node',
+        [
+          '-e',
+          `const plugin = require('${pkgName}/app.plugin.js'); if (typeof plugin !== 'function' && typeof plugin.default !== 'function') { process.exit(2); }`,
+        ],
+        { cwd: installDir, encoding: 'utf8', stdio: ['ignore', 'pipe', 'pipe'] },
+      );
+      if (requireCheck.status !== 0) {
+        failures.push({
+          package: pkgName,
+          detail: `require('${pkgName}/app.plugin.js') failed: ${
+            requireCheck.stderr || `exit ${requireCheck.status}`
+          }`,
+        });
+      }
+    }
+  } finally {
+    try {
+      fs.rmSync(tmpRoot, { recursive: true, force: true });
+    } catch {
+      // ignore cleanup errors
+    }
+  }
+
+  return failures;
+}
+
+function printAttwReport(rows: IssueRow[]): void {
+  if (rows.length === 0) {
+    console.log('\n✅ attw: all published packages pass scoped analysis (.attw.json).\n');
+    return;
+  }
+
+  console.log(`\n❌ attw: ${rows.length} enforced problem(s) under .attw.json scope:\n`);
+  console.log('| # | Package | Entrypoint | Resolution | Problem | Detail |');
+  console.log('|---:|---|---|---|---|---|');
+  rows.forEach((row, index) => {
+    const cells = [
+      String(index + 1),
+      row.package,
+      row.entrypoint,
+      row.resolution,
+      row.problem,
+      row.detail,
+    ].map(value => value.replace(/\|/g, '\\|'));
+    console.log(`| ${cells.join(' | ')} |`);
+  });
+  console.log('');
+}
+
+function printExpoPluginReport(failures: ExpoPluginFailure[]): void {
+  if (failures.length === 0) {
+    console.log('✅ Expo config plugins: consumer smoke test passed.\n');
+    return;
+  }
+
+  console.log(`❌ Expo config plugins: ${failures.length} failure(s):\n`);
+  failures.forEach((failure, index) => {
+    console.log(`${index + 1}. ${failure.package}: ${failure.detail}`);
+  });
+  console.log('');
+}
+
+function main(): void {
+  if (!fs.existsSync(attwBin)) {
+    console.error('attw binary not found — run `yarn install` in .github/scripts/attw first');
+    process.exit(1);
+  }
+
+  if (!fs.existsSync(attwConfigPath)) {
+    console.error(`Missing ${attwConfigPath}`);
+    process.exit(1);
+  }
+
+  const config = readAttwConfig();
+  const allRows: IssueRow[] = [];
+  for (const dir of listPublishedPackages()) {
+    const result = runAttw(path.join(packagesDir, dir), dir, config);
+    if (!result.passed) {
+      allRows.push(...result.issues);
+    }
+  }
+
+  const expoFailures = checkExpoPlugins();
+
+  printAttwReport(allRows);
+  printExpoPluginReport(expoFailures);
+
+  const hasFailures = allRows.length > 0 || expoFailures.length > 0;
+  process.exit(hasFailures ? 1 : 0);
+}
+
+main();
diff --git a/.github/scripts/attw/tsconfig.json b/.github/scripts/attw/tsconfig.json
new file mode 100644
index 0000000000..6b1c9c1b1b
--- /dev/null
+++ b/.github/scripts/attw/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "strict": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "outDir": "dist",
+    "rootDir": "."
+  },
+  "include": ["src/**/*.ts"]
+}
diff --git a/.github/scripts/attw/yarn.lock b/.github/scripts/attw/yarn.lock
new file mode 100644
index 0000000000..8f84118a9e
--- /dev/null
+++ b/.github/scripts/attw/yarn.lock
@@ -0,0 +1,1021 @@
+# This file is generated by running "yarn install" inside your project.
+# Manual changes might be lost - proceed with caution!
+
+__metadata:
+  version: 9
+  cacheKey: 10
+
+"@andrewbranch/untar.js@npm:^1.0.3":
+  version: 1.0.3
+  resolution: "@andrewbranch/untar.js@npm:1.0.3"
+  checksum: 10/a32de53839fc61af90a394cf93d4368aacd167c9c80f0b3ba0c268460942a6ce2bfe257b6d3f03986b9dcb7368f10b9dc7f66c2f94254d2662da8278454e7d12
+  languageName: node
+  linkType: hard
+
+"@arethetypeswrong/cli@npm:^0.18.4":
+  version: 0.18.4
+  resolution: "@arethetypeswrong/cli@npm:0.18.4"
+  dependencies:
+    "@arethetypeswrong/core": "npm:0.18.4"
+    chalk: "npm:^4.1.2"
+    cli-table3: "npm:^0.6.3"
+    commander: "npm:^10.0.1"
+    marked: "npm:^9.1.2"
+    marked-terminal: "npm:^7.1.0"
+    semver: "npm:^7.5.4"
+  bin:
+    attw: ./dist/index.js
+  checksum: 10/1fa80ebef4602363856e3edeea584f8fe625a5d14c7f82e6258a9c436c701cbd21f81e92b94794dde0a701c04ddc7376e10d008a98927f0b8e8cecb4e4eba857
+  languageName: node
+  linkType: hard
+
+"@arethetypeswrong/core@npm:0.18.4":
+  version: 0.18.4
+  resolution: "@arethetypeswrong/core@npm:0.18.4"
+  dependencies:
+    "@andrewbranch/untar.js": "npm:^1.0.3"
+    "@loaderkit/resolve": "npm:^1.0.2"
+    cjs-module-lexer: "npm:^1.2.3"
+    fflate: "npm:^0.8.3"
+    lru-cache: "npm:^11.0.1"
+    semver: "npm:^7.5.4"
+    typescript: "npm:5.6.1-rc"
+    validate-npm-package-name: "npm:^5.0.0"
+  checksum: 10/c4ba9fc03cece747b8f955061141cd169879dfdc7bdacbe79c45d5bc1c9cc1086889be8373796b442ff436cb45271205ffef4aad6f2a9fae7dbd0f247a6db538
+  languageName: node
+  linkType: hard
+
+"@braidai/lang@npm:^1.0.0":
+  version: 1.1.2
+  resolution: "@braidai/lang@npm:1.1.2"
+  checksum: 10/04ece1b744eb8b6c2417afe220ad96c7078f83ed533117cc49300b6322f6b58f5e649c80bd990c27e2d16bfdd976481d5252ff3206b7069fc863890ab1b96277
+  languageName: node
+  linkType: hard
+
+"@colors/colors@npm:1.5.0":
+  version: 1.5.0
+  resolution: "@colors/colors@npm:1.5.0"
+  checksum: 10/9d226461c1e91e95f067be2bdc5e6f99cfe55a721f45afb44122e23e4b8602eeac4ff7325af6b5a369f36396ee1514d3809af3f57769066d80d83790d8e53339
+  languageName: node
+  linkType: hard
+
+"@esbuild/aix-ppc64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/aix-ppc64@npm:0.28.1"
+  conditions: os=aix & cpu=ppc64
+  languageName: node
+  linkType: hard
+
+"@esbuild/android-arm64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/android-arm64@npm:0.28.1"
+  conditions: os=android & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/android-arm@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/android-arm@npm:0.28.1"
+  conditions: os=android & cpu=arm
+  languageName: node
+  linkType: hard
+
+"@esbuild/android-x64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/android-x64@npm:0.28.1"
+  conditions: os=android & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/darwin-arm64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/darwin-arm64@npm:0.28.1"
+  conditions: os=darwin & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/darwin-x64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/darwin-x64@npm:0.28.1"
+  conditions: os=darwin & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/freebsd-arm64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/freebsd-arm64@npm:0.28.1"
+  conditions: os=freebsd & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/freebsd-x64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/freebsd-x64@npm:0.28.1"
+  conditions: os=freebsd & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-arm64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/linux-arm64@npm:0.28.1"
+  conditions: os=linux & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-arm@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/linux-arm@npm:0.28.1"
+  conditions: os=linux & cpu=arm
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-ia32@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/linux-ia32@npm:0.28.1"
+  conditions: os=linux & cpu=ia32
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-loong64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/linux-loong64@npm:0.28.1"
+  conditions: os=linux & cpu=loong64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-mips64el@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/linux-mips64el@npm:0.28.1"
+  conditions: os=linux & cpu=mips64el
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-ppc64@npm:0.28.1":
+  version: 0.28.1
+  resolution: "@esbuild/linux-ppc64@npm:0.28.1"
+  conditions: os=linux & cpu=ppc64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-riscv64@npm:0.28.1":
+  version: 0.28.1
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diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
index fc1bc75bbb..611a734ef0 100644
--- a/.github/workflows/linting.yml
+++ b/.github/workflows/linting.yml
@@ -122,6 +122,48 @@ jobs:
           key: ${{ runner.os }}-yarn-v1-${{ hashFiles('yarn.lock') }}
 
 
+  attw:
+    name: Published Package Types (attw)
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      # https://github.com/actions/checkout/releases
+      - uses: actions/checkout@9f698171ed81b15d1823a05fc7211befd50c8ae0 # v6.0.3
+        with:
+          fetch-depth: 1
+      # https://github.com/actions/setup-node/releases
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: 22
+      # https://github.com/actions/cache/releases
+      - uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        name: Yarn Cache Restore
+        id: yarn-cache
+        continue-on-error: true
+        with:
+          path: .yarn/cache
+          key: ${{ runner.os }}-yarn-v1-${{ hashFiles('yarn.lock') }}
+          restore-keys: ${{ runner.os }}-yarn-v1
+      - name: Yarn Install
+        # https://github.com/nick-fields/retry/releases
+        uses: nick-fields/retry@ad984534de44a9489a53aefd81eb77f87c70dc60 # v4.0.0
+        with:
+          timeout_minutes: 15
+          retry_wait_seconds: 30
+          max_attempts: 3
+          command: yarn
+      - name: Are The Types Wrong
+        run: yarn attw:check
+      # https://github.com/actions/cache/releases
+      - uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        name: Yarn Cache Save
+        if: "${{ github.ref == 'refs/heads/main' }}"
+        continue-on-error: true
+        with:
+          path: .yarn/cache
+          key: ${{ runner.os }}-yarn-v1-${{ hashFiles('yarn.lock') }}
+
+
   consumer-types:
     name: Consumer Type Test
     runs-on: ubuntu-latest
diff --git a/okf-bundle/index.md b/okf-bundle/index.md
index 878024af23..5557f89f6f 100644
--- a/okf-bundle/index.md
+++ b/okf-bundle/index.md
@@ -18,6 +18,7 @@ okf_version: "0.1"
 * [Iteration vocabulary](/testing/iteration-vocabulary.md) — work type, tier, and queue field identifiers
 * [Running e2e tests](/testing/running-e2e.md) — canonical e2e commands, narrowing, environment, diagnosis
 * [Validation checklist](/testing/validation-checklist.md) — compile, Jest, lint, `compare:types`, e2e, coverage
+* [Published types ADR](/testing/architecture-decisions.md) — attw scope, Expo plugin checks, discarded resolutions
 * [Coverage design](/testing/coverage-design.md) — unit/e2e coverage policy, native gates, Codecov
 * [Firebase testing project](/testing/firebase-testing-project.md) — cloud vs emulator, live FIS/RC, helper callables, rules/indexes, deploy
 
diff --git a/okf-bundle/testing/architecture-decisions.md b/okf-bundle/testing/architecture-decisions.md
new file mode 100644
index 0000000000..84d1f16cbd
--- /dev/null
+++ b/okf-bundle/testing/architecture-decisions.md
@@ -0,0 +1,115 @@
+---
+type: Reference
+title: Published types and CI decisions (ADR)
+description: Canonical owner of durable decisions for published-package type checking (attw, consumer tsc, Expo config plugins).
+tags: [testing, types, attw, expo, adr]
+timestamp: 2026-07-10T00:00:00Z
+---
+
+# Published types and CI decisions (ADR)
+
+**Canonical owner** of durable decisions for how RNFB validates published package types in CI. Procedure and commands: [validation checklist](validation-checklist.md). Implementation: `.attw.json`, `.github/scripts/attw/`, `tsconfig.consumer.json`.
+
+**Policy:** [OKF documentation policy](../documentation-policy.md). Do not duplicate these decisions in work queues.
+
+## Decision ID convention
+
+Use the **`Types-AD-<n>`** prefix when citing these decisions in code or docs.
+
+## Status legend
+
+| Status | Meaning |
+|--------|---------|
+| **Accepted** | Decided; CI enforces this. |
+| **Proposed** | Planned; not yet enforced. |
+
+---
+
+## Types-AD-1 — Consumer matrix drives attw scope — **Accepted**
+
+RNFB published types are validated against the **actual consumer matrix**, not generic npm “strict” resolution.
+
+**Supported consumer chain (current direction):**
+
+| Layer | Minimum | Notes |
+|-------|---------|-------|
+| iOS / Xcode | firebase-ios-sdk 12.12.0+ → Xcode 26.2+ | Drives recent RN only |
+| React Native | New Architecture only (coordinated major) | Metro bundler, not Node `require()` for app JS |
+| Node (dev) | RN 0.84+ → Node **22.11.0+**; RN 0.81–0.83 → Node **20.19.4+** | See [RN support matrix](https://github.com/reactwg/react-native-releases/blob/main/docs/support.md) |
+| TypeScript (app) | `moduleResolution: "bundler"` | `yarn tsc:compile:consumer` |
+
+**Why:** Node 10 and Node 16 are EOL. RN apps resolve `@react-native-firebase/*` through Metro (`bundler`), not through Node10/Node16-CJS `require()`. attw `strict` (185 findings on current packages) mostly reports resolution modes our consumers never use.
+
+**CI gates (ordered):**
+
+1. `yarn tsc:compile` — monorepo internal TS
+2. `yarn tsc:compile:consumer` — **primary RN app consumer gate** (`bundler`)
+3. `yarn attw:check` — published tarball hygiene (scoped per Types-AD-2)
+4. Expo plugin smoke test inside `yarn attw:check` (Types-AD-3)
+
+---
+
+## Types-AD-2 — attw profile and ignored rules — **Accepted**
+
+`yarn attw:check` uses repo-root [`.attw.json`](../../.attw.json):
+
+```json
+{
+  "profile": "esm-only",
+  "ignoreRules": ["internal-resolution-error", "cjs-resolves-to-esm"]
+}
+```
+
+| attw mode | Enforced? | Discarded because |
+|-----------|-----------|-------------------|
+| **node10** | No (`esm-only` ignores) | EOL; no RN consumer uses Node10 resolution |
+| **node16-cjs** | No (`esm-only` ignores) | RN apps do not `require()` RNFB JS from Node; plugins are separate (Types-AD-3) |
+| **node16-esm `InternalResolutionError`** | No (`ignoreRules`) | Extensionless `.d.ts` relative imports fail Node16 but **`bundler` passes** — covered by consumer tsc |
+| **`CJSResolvesToESM`** | No (`ignoreRules`) | ESM-only published JS is intentional; Metro/bundler consumers resolve correctly |
+| **node16-esm + bundler (remaining)** | **Yes** | Real export/type surface regressions for modern consumers |
+
+attw has **no Node 22 or bundler-only profile**. This config is the closest match to the RN consumer matrix until upstream adds finer profiles.
+
+**Advisory only (not a merge gate):** `attw --profile strict` may be run locally to see the full generic-npm report.
+
+---
+
+## Types-AD-3 — Expo config plugins: separate validation path — **Accepted**
+
+Expo config plugins are **not** validated by discarding `app.plugin.js` from attw. They use a dedicated smoke test in `yarn attw:check`.
+
+**How Expo loads library plugins:**
+
+1. User adds `"@react-native-firebase/<module>"` to `app.json` / `app.config` `plugins`.
+2. Expo CLI resolves `app.plugin.js` at the package root ([Expo library plugin docs](https://docs.expo.dev/config-plugins/development-for-libraries/)).
+3. Root `app.plugin.js` is a one-line shim: `module.exports = require('./plugin/build/app.plugin')` (required at package root for Expo filesystem probe).
+4. Plugin sources compile with `tsc --build plugin` (`@tsconfig/node-lts`) into `plugin/build/` — including `app.plugin.ts` (`export =`) for types and runtime entry.
+
+**What we check for each package with `app.plugin.js`:**
+
+| Check | Purpose |
+|-------|---------|
+| `plugin/build/app.plugin.js` exists after `prepare` | Tarball contains compiled Expo entry (`export =` from `plugin/src/app.plugin.ts`) |
+| `exports["./app.plugin"]` + `exports["./app.plugin.js"].types` → `plugin/build/app.plugin.d.ts` | Strict Expo resolver + attw `export =` matches CJS shim |
+| Consumer smoke: `npm pack` → temp install with `@react-native-firebase/app` (when needed) + `@expo/config-plugins` → `require('<pkg>/app.plugin.js')` | Matches Expo prebuild Node resolution |
+
+**Packages with plugins (8):** `app`, `analytics`, `auth`, `messaging`, `crashlytics`, `perf`, `app-check`, `app-distribution`.
+
+**Why attw `UntypedResolution` / `FalseExportDefault` on `app.plugin.js` was misleading:** attw compares the root CJS shim against declaration shape. `plugin/src/app.plugin.ts` compiles to `plugin/build/app.plugin.d.ts` with `export =`, matching `module.exports = require('./plugin/build/app.plugin')`. `plugin/build/index.d.ts` keeps `export default` for the implementation module. Runtime correctness is additionally covered by the consumer smoke test.
+
+**Plugin layout:** committed TypeScript under `plugin/src/` (including `app.plugin.ts`); built JS + `.d.ts` under `plugin/build/` (gitignored). Package root keeps only the one-line `app.plugin.js` shim.
+
+**Plugin authoring lint:** `yarn lint:plugin` per package (eslint on `plugin/src`) — run when editing plugin sources; not duplicated in attw script.
+
+---
+
+## Types-AD-4 — Perfection target — **Accepted**
+
+**Merge gate “perfection”** means:
+
+- `yarn tsc:compile:consumer` — zero errors
+- `yarn attw:check` — zero errors under Types-AD-2 config **and** Expo plugin smoke passes
+
+Fixing all 185 `strict` findings is **not** a merge requirement unless Types-AD-2 is revised.
+
+Future improvement (Proposed): emit `.d.ts` with `.js` extension suffixes in relative imports to clear Node16 `InternalResolutionError` without ignoring the rule — only if we expand supported consumers beyond `bundler`.
diff --git a/okf-bundle/testing/validation-checklist.md b/okf-bundle/testing/validation-checklist.md
index 553e6af2f7..7cfc71a689 100644
--- a/okf-bundle/testing/validation-checklist.md
+++ b/okf-bundle/testing/validation-checklist.md
@@ -34,6 +34,7 @@ yarn lerna:prepare                    # after packages/*/lib/** edits — transp
 yarn lerna run prepare --scope @react-native-firebase/<pkg>   # single package only when needed
 yarn tsc:compile
 yarn tsc:compile:consumer
+yarn attw:check                    # scoped attw + Expo plugin smoke — [Types-AD-1..4](architecture-decisions.md)
 ```
 
 `yarn lerna:prepare` runs each package **`prepare`** script (`build` then `compile`/bob). That is the canonical **`lib/**` → `dist/module/**`** path. Do **not** use `cd packages/<pkg> && yarn compile` as a substitute — `compile` is a step **inside** `prepare`, not a standalone agent entrypoint.
@@ -152,6 +153,7 @@ Before closing **`implementation_gate`**, **`review_gate`**, **`commit_gate`**,
 
 - [ ] `yarn lerna:prepare` (after any `packages/*/lib/**` edits)
 - [ ] `yarn tsc:compile`, `yarn tsc:compile:consumer`
+- [ ] `yarn attw:check` when `package.json` `exports`, `plugin/build`, or published types changed ([Types-AD](architecture-decisions.md))
 - [ ] `yarn reference:api`
 - [ ] Redirect audit when TypeDoc config changed ([documentation site maintenance § redirect audit](../documentation-site-maintenance.md#redirect-audit-required-when-typedoc-config-changes))
 - [ ] `yarn tests:jest`
diff --git a/package.json b/package.json
index a33b152201..99e79ee690 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "build:all:build": "lerna run build",
     "test:functions:build": "cd .github/workflows/scripts/functions && yarn build",
     "compare:types": "cd .github/scripts/compare-types && yarn install && yarn compare",
+    "attw:check": "cd .github/scripts/attw && yarn install && yarn check",
     "codegen:all": "lerna run codegen",
     "codegen:verify": "node ./scripts/codegen-verify.mjs && git diff --exit-code -- 'packages/*/android/**/generated/**' 'packages/*/ios/generated/**'",
     "lint": "yarn lint:js && yarn lint:android && yarn lint:ios:check",
diff --git a/packages/analytics/app.plugin.js b/packages/analytics/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/analytics/app.plugin.js
+++ b/packages/analytics/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/analytics/package.json b/packages/analytics/package.json
index b96e75ded3..7337bb0338 100644
--- a/packages/analytics/package.json
+++ b/packages/analytics/package.json
@@ -68,7 +68,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/analytics/plugin/src/app.plugin.ts b/packages/analytics/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/analytics/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/app-check/app.plugin.js b/packages/app-check/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/app-check/app.plugin.js
+++ b/packages/app-check/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/app-check/package.json b/packages/app-check/package.json
index 3bdcb78014..af6bde4d29 100644
--- a/packages/app-check/package.json
+++ b/packages/app-check/package.json
@@ -66,7 +66,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/app-check/plugin/src/app.plugin.ts b/packages/app-check/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/app-check/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/app-distribution/app.plugin.js b/packages/app-distribution/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/app-distribution/app.plugin.js
+++ b/packages/app-distribution/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/app-distribution/package.json b/packages/app-distribution/package.json
index 995ed56c7b..95a78db301 100644
--- a/packages/app-distribution/package.json
+++ b/packages/app-distribution/package.json
@@ -64,7 +64,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/app-distribution/plugin/src/app.plugin.ts b/packages/app-distribution/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/app-distribution/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/app/app.plugin.js b/packages/app/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/app/app.plugin.js
+++ b/packages/app/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/app/package.json b/packages/app/package.json
index f01a9dffbe..dd576f68f1 100644
--- a/packages/app/package.json
+++ b/packages/app/package.json
@@ -96,7 +96,14 @@
       "types": "./dist/typescript/lib/common/*.d.ts",
       "default": "./dist/module/common/*.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "peerDependencies": {
diff --git a/packages/app/plugin/src/app.plugin.ts b/packages/app/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/app/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/auth/app.plugin.js b/packages/auth/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/auth/app.plugin.js
+++ b/packages/auth/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/auth/package.json b/packages/auth/package.json
index 3e5c0e68a7..0fb57eb1e5 100644
--- a/packages/auth/package.json
+++ b/packages/auth/package.json
@@ -68,7 +68,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/auth/plugin/src/app.plugin.ts b/packages/auth/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/auth/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/crashlytics/app.plugin.js b/packages/crashlytics/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/crashlytics/app.plugin.js
+++ b/packages/crashlytics/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/crashlytics/package.json b/packages/crashlytics/package.json
index e66d7c51dc..2c48ffba50 100644
--- a/packages/crashlytics/package.json
+++ b/packages/crashlytics/package.json
@@ -73,7 +73,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/crashlytics/plugin/src/app.plugin.ts b/packages/crashlytics/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/crashlytics/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/messaging/app.plugin.js b/packages/messaging/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/messaging/app.plugin.js
+++ b/packages/messaging/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/messaging/package.json b/packages/messaging/package.json
index f3c678ac5c..937b04a75e 100644
--- a/packages/messaging/package.json
+++ b/packages/messaging/package.json
@@ -65,7 +65,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/messaging/plugin/src/app.plugin.ts b/packages/messaging/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/messaging/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;
diff --git a/packages/perf/app.plugin.js b/packages/perf/app.plugin.js
index 3c7d11b615..183ab215a2 100644
--- a/packages/perf/app.plugin.js
+++ b/packages/perf/app.plugin.js
@@ -1 +1 @@
-module.exports = require('./plugin/build');
+module.exports = require('./plugin/build/app.plugin');
diff --git a/packages/perf/package.json b/packages/perf/package.json
index 9d3d85c6e7..69d4d729a3 100644
--- a/packages/perf/package.json
+++ b/packages/perf/package.json
@@ -69,7 +69,14 @@
       "types": "./dist/typescript/lib/index.d.ts",
       "default": "./dist/module/index.js"
     },
-    "./app.plugin.js": "./app.plugin.js",
+    "./app.plugin": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
+    "./app.plugin.js": {
+      "types": "./plugin/build/app.plugin.d.ts",
+      "default": "./app.plugin.js"
+    },
     "./package.json": "./package.json"
   },
   "react-native-builder-bob": {
diff --git a/packages/perf/plugin/src/app.plugin.ts b/packages/perf/plugin/src/app.plugin.ts
new file mode 100644
index 0000000000..822e60b7f6
--- /dev/null
+++ b/packages/perf/plugin/src/app.plugin.ts
@@ -0,0 +1,3 @@
+import plugin from './index';
+
+export = plugin;