[build-tools] resolve repack version

packages/build-tools/src/steps/functions/repack.ts

@@ -23,6 +23,7 @@ import resolveFrom from 'resolve-from';
 
 import { COMMON_FASTLANE_ENV } from '../../common/fastlane';
 import IosCredentialsManager from '../utils/ios/credentials/manager';
+import { resolvePackageVersionAsync } from '../../utils/packageManager';
 
 export function createRepackBuildFunction(): BuildFunction {
   return new BuildFunction({
@@ -108,12 +109,18 @@ export function createRepackBuildFunction(): BuildFunction {
         : undefined;
       const jsBundleOnly = (inputs.js_bundle_only.value as boolean | undefined) ?? false;
 
+      const resolvedRepackVersion =
+        (await resolvePackageVersionAsync({
+          logger: stepsCtx.logger,
+          packageName: inputs.repack_package.value as string,
+          distTag: inputs.repack_version.value as string,
+        })) ?? (inputs.repack_version.value as string);
       stepsCtx.logger.info(
-        `Using repack from: ${inputs.repack_package.value}@${inputs.repack_version.value}`
+        `Using repack from: ${inputs.repack_package.value}@${inputs.repack_version.value} (${resolvedRepackVersion})`
       );
       const repackApp = await installAndImportRepackAsync({
         packageName: inputs.repack_package.value as string,
-        version: inputs.repack_version.value as string,
+        version: resolvedRepackVersion,
       });
       const { repackAppIosAsync, repackAppAndroidAsync } = repackApp;
 

packages/build-tools/src/utils/__tests__/packageManager.test.ts

@@ -1,11 +1,14 @@
+import { type bunyan } from '@expo/logger';
 import fs from 'fs-extra';
 import { vol } from 'memfs';
 import path from 'path';
+import semver from 'semver';
 
 import {
   findPackagerRootDir,
   getPackageVersionFromPackageJson,
   resolvePackageManager,
+  resolvePackageVersionAsync,
   shouldUseFrozenLockfile,
 } from '../packageManager';
 
@@ -68,6 +71,33 @@ describe(resolvePackageManager, () => {
   });
 });
 
+describe(resolvePackageVersionAsync, () => {
+  const logger = {
+    debug: jest.fn(),
+    info: jest.fn(),
+    warn: jest.fn(),
+    error: jest.fn(),
+  } as unknown as bunyan;
+
+  it('should resolve version from package name and dist tag', async () => {
+    const version = await resolvePackageVersionAsync({
+      logger,
+      packageName: '@expo/repack-app',
+      distTag: 'latest',
+    });
+    expect(semver.valid(version)).toBeTruthy();
+  });
+
+  it('should return null if version cannot be resolved', async () => {
+    const version = await resolvePackageVersionAsync({
+      logger,
+      packageName: '@expo/repack-app',
+      distTag: 'nonexistent-dist-tag',
+    });
+    expect(version).toBeNull();
+  });
+});
+
 describe(findPackagerRootDir, () => {
   beforeEach(() => {
     vol.reset();

packages/build-tools/src/utils/packageManager.ts

@@ -1,3 +1,4 @@
+import { type bunyan } from '@expo/logger';
 import * as PackageManagerUtils from '@expo/package-manager';
 import spawnAsync from '@expo/turtle-spawn';
 import semver from 'semver';
@@ -27,6 +28,34 @@ export function resolvePackageManager(directory: string): PackageManager {
   }
 }
 
+/**
+ * Get the version of a package from the dist-tags.
+ * Returns null if the version cannot be resolved.
+ */
+export async function resolvePackageVersionAsync({
+  logger,
+  packageName,
+  distTag,
+}: {
+  logger: bunyan;
+  packageName: string;
+  distTag: string;
+}): Promise<string | null> {
+  try {
+    const { stdout } = await spawnAsync('npm', ['view', packageName, 'dist-tags', '--json'], {
+      stdio: 'pipe',
+    });
+    const distTags = JSON.parse(stdout);
+    if (distTag in distTags) {
+      return distTags[distTag];
+    }
+  } catch (e: unknown) {
+    const message = e instanceof Error ? e.message : String(e);
+    logger.warn(`Unable to resolve version for ${packageName}@${distTag}: ${message}`);
+  }
+  return null;
+}
+
 export function findPackagerRootDir(currentDir: string): string {
   return PackageManagerUtils.resolveWorkspaceRoot(currentDir) ?? currentDir;
 }