fix(@angular/cli): support registry metadata fetching under bun package manager

Bun's `pm view` command does not support requesting multiple fields at once (e.g. `pm view <pkg> dist-tags versions --json`), which is required by the default package manager abstraction to fetch package metadata during version compatibility search.

This change introduces a custom `getRegistryMetadata` handler in the package manager descriptor, allowing individual package managers to override registry metadata fetching entirely. The `bun` descriptor now implements this by querying `dist-tags` and `versions` separately in parallel, and returning the aggregated metadata object.

Author: clydin

packages/angular/cli/src/package-managers/package-manager-descriptor.ts

@@ -99,6 +99,15 @@ export interface PackageManagerDescriptor {
   /** A function that formats the arguments for field-filtered registry views. */
   readonly viewCommandFieldArgFormatter?: (fields: readonly string[]) => string[];
 
+  /** An optional custom function to fetch registry metadata when the default logic is not sufficient. */
+  readonly getRegistryMetadata?: (
+    packageName: string,
+    fetchAndParse: <T>(
+      args: readonly string[],
+      parser: (stdout: string, logger?: Logger) => T | null,
+    ) => Promise<T | null>,
+  ) => Promise<PackageMetadata | null>;
+
   /** A collection of functions to parse the output of specific commands. */
   readonly outputParsers: {
     /** A function to parse the output of `listDependenciesCommand`. */
@@ -273,6 +282,34 @@ export const SUPPORTED_PACKAGE_MANAGERS = {
     versionCommand: ['--version'],
     listDependenciesCommand: ['pm', 'ls'],
     getManifestCommand: ['pm', 'view', '--json'],
+    getRegistryMetadata: async (packageName, fetchAndParse) => {
+      const [distTags, versions] = await Promise.all([
+        fetchAndParse(['pm', 'view', '--json', packageName, 'dist-tags'], (stdout) => {
+          if (!stdout) {
+            return null;
+          }
+
+          return JSON.parse(stdout);
+        }),
+        fetchAndParse(['pm', 'view', '--json', packageName, 'versions'], (stdout) => {
+          if (!stdout) {
+            return null;
+          }
+
+          return JSON.parse(stdout);
+        }),
+      ]);
+
+      if (!distTags || !versions) {
+        return null;
+      }
+
+      return {
+        name: packageName,
+        'dist-tags': distTags as Record<string, string>,
+        versions: versions as string[],
+      };
+    },
     outputParsers: {
       listDependencies: parseBunDependencies,
       getRegistryManifest: parseNpmLikeManifest,

packages/angular/cli/src/package-managers/package-manager.ts

@@ -441,19 +441,37 @@ export class PackageManager {
     packageName: string,
     options: { timeout?: number; registry?: string; bypassCache?: boolean } = {},
   ): Promise<PackageMetadata | null> {
-    const commandArgs = [...this.descriptor.getManifestCommand, packageName];
-    const formatter = this.descriptor.viewCommandFieldArgFormatter;
-    if (formatter) {
-      commandArgs.push(...formatter(METADATA_FIELDS));
+    const cacheKey = options.registry ? `${packageName}|${options.registry}` : packageName;
+
+    if (!options.bypassCache) {
+      const cached = this.#metadataCache.get(cacheKey);
+      if (cached !== undefined) {
+        return cached;
+      }
     }
 
-    const cacheKey = options.registry ? `${packageName}|${options.registry}` : packageName;
+    let metadata: PackageMetadata | null = null;
+    if (this.descriptor.getRegistryMetadata) {
+      metadata = await this.descriptor.getRegistryMetadata(packageName, (args, parser) =>
+        this.#fetchAndParse(args, parser, options),
+      );
+    } else {
+      const commandArgs = [...this.descriptor.getManifestCommand, packageName];
+      const formatter = this.descriptor.viewCommandFieldArgFormatter;
+      if (formatter) {
+        commandArgs.push(...formatter(METADATA_FIELDS));
+      }
 
-    return this.#fetchAndParse(
-      commandArgs,
-      (stdout, logger) => this.descriptor.outputParsers.getRegistryMetadata(stdout, logger),
-      { ...options, cache: this.#metadataCache, cacheKey },
-    );
+      metadata = await this.#fetchAndParse(
+        commandArgs,
+        (stdout, logger) => this.descriptor.outputParsers.getRegistryMetadata(stdout, logger),
+        options,
+      );
+    }
+
+    this.#metadataCache.set(cacheKey, metadata);
+
+    return metadata;
   }
 
   /**

packages/angular/cli/src/package-managers/package-manager_spec.ts

@@ -86,6 +86,42 @@ describe('PackageManager', () => {
     });
   });
 
+  describe('getRegistryMetadata', () => {
+    it('should query dist-tags and versions separately for bun', async () => {
+      const bunDescriptor = SUPPORTED_PACKAGE_MANAGERS['bun'];
+      const pm = new PackageManager(host, '/tmp', bunDescriptor);
+
+      runCommandSpy.and.callFake((binary, args) => {
+        if (args.includes('dist-tags')) {
+          return Promise.resolve({ stdout: JSON.stringify({ latest: '2.0.0' }), stderr: '' });
+        } else if (args.includes('versions')) {
+          return Promise.resolve({ stdout: JSON.stringify(['1.0.0', '2.0.0']), stderr: '' });
+        }
+
+        return Promise.resolve({ stdout: '', stderr: '' });
+      });
+
+      const metadata = await pm.getRegistryMetadata('foo');
+
+      expect(metadata).toEqual({
+        name: 'foo',
+        'dist-tags': { latest: '2.0.0' },
+        versions: ['1.0.0', '2.0.0'],
+      });
+
+      expect(runCommandSpy).toHaveBeenCalledWith(
+        'bun',
+        ['pm', 'view', '--json', 'foo', 'dist-tags'],
+        jasmine.anything(),
+      );
+      expect(runCommandSpy).toHaveBeenCalledWith(
+        'bun',
+        ['pm', 'view', '--json', 'foo', 'versions'],
+        jasmine.anything(),
+      );
+    });
+  });
+
   describe('initializationError', () => {
     it('should throw initializationError when running commands', async () => {
       const error = new Error('Not installed');