fix(@angular/cli): correctly handle yarn classic tag manifest fetching

Introduces a `requiresManifestTagLookup` property to `PackageManagerDescriptor` to control whether a package manager needs an explicit metadata lookup for tags
(or when no `fetchSpec` is provided) before attempting to fetch the full registry manifest.

This change optimizes manifest fetching by enabling a preliminary metadata lookup for package managers like `yarn-classic` that require it to resolve tags to
concrete versions.

Author: clydin

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

@@ -20,7 +20,8 @@ import {
   parseNpmLikeManifest,
   parseNpmLikeMetadata,
   parseYarnClassicDependencies,
-  parseYarnLegacyManifest,
+  parseYarnClassicManifest,
+  parseYarnClassicMetadata,
   parseYarnModernDependencies,
 } from './parsers';
 
@@ -73,6 +74,9 @@ export interface PackageManagerDescriptor {
   /** The command to fetch the registry manifest of a package. */
   readonly getManifestCommand: readonly string[];
 
+  /** Whether a tag needs a lookup prior to fetching a registry manifest. */
+  readonly requiresManifestTagLookup?: boolean;
+
   /** A function that formats the arguments for field-filtered registry views. */
   readonly viewCommandFieldArgFormatter?: (fields: readonly string[]) => string[];
 
@@ -166,10 +170,11 @@ export const SUPPORTED_PACKAGE_MANAGERS = {
     versionCommand: ['--version'],
     listDependenciesCommand: ['list', '--depth=0', '--json'],
     getManifestCommand: ['info', '--json'],
+    requiresManifestTagLookup: true,
     outputParsers: {
       listDependencies: parseYarnClassicDependencies,
-      getRegistryManifest: parseYarnLegacyManifest,
-      getRegistryMetadata: parseNpmLikeMetadata,
+      getRegistryManifest: parseYarnClassicManifest,
+      getRegistryMetadata: parseYarnClassicMetadata,
     },
   },
   pnpm: {

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

@@ -156,12 +156,14 @@ export class PackageManager {
       return { stdout: '', stderr: '' };
     }
 
-    return this.host.runCommand(this.descriptor.binary, finalArgs, {
+    const commandResult = await this.host.runCommand(this.descriptor.binary, finalArgs, {
       ...runOptions,
       cwd: executionDirectory,
       stdio: 'pipe',
       env: finalEnv,
     });
+
+    return { stdout: commandResult.stdout.trim(), stderr: commandResult.stderr.trim() };
   }
 
   /**
@@ -395,13 +397,26 @@ export class PackageManager {
     switch (type) {
       case 'range':
       case 'version':
-      case 'tag':
+      case 'tag': {
         if (!name) {
           throw new Error(`Could not parse package name from specifier: ${specifier}`);
         }
 
         // `fetchSpec` is the version, range, or tag.
-        return this.getRegistryManifest(name, fetchSpec ?? 'latest', options);
+        let versionSpec = fetchSpec ?? 'latest';
+        if ((type === 'tag' || !fetchSpec) && this.descriptor.requiresManifestTagLookup) {
+          const metadata = await this.getRegistryMetadata(name, options);
+          if (!metadata) {
+            return null;
+          }
+          versionSpec = metadata['dist-tags'][versionSpec];
+          if (!versionSpec) {
+            return null;
+          }
+        }
+
+        return this.getRegistryManifest(name, versionSpec, options);
+      }
       case 'directory': {
         if (!fetchSpec) {
           throw new Error(`Could not parse directory path from specifier: ${specifier}`);

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

@@ -269,12 +269,12 @@ export function parseNpmLikeMetadata(stdout: string, logger?: Logger): PackageMe
 }
 
 /**
- * Parses the output of `yarn info` (classic).
+ * Parses the output of `yarn info` (classic) to get a package manifest.
  * @param stdout The standard output of the command.
  * @param logger An optional logger instance.
  * @returns The package manifest object.
  */
-export function parseYarnLegacyManifest(stdout: string, logger?: Logger): PackageManifest | null {
+export function parseYarnClassicManifest(stdout: string, logger?: Logger): PackageManifest | null {
   logger?.debug(`Parsing yarn classic manifest...`);
   logStdout(stdout, logger);
 
@@ -287,5 +287,39 @@ export function parseYarnLegacyManifest(stdout: string, logger?: Logger): Packag
   const data = JSON.parse(stdout);
 
   // Yarn classic wraps the manifest in a `data` property.
-  return data.data ?? data;
+  const manifest = data.data as PackageManifest;
+
+  // Yarn classic removes any field with a falsy value
+  // https://github.com/yarnpkg/yarn/blob/7cafa512a777048ce0b666080a24e80aae3d66a9/src/cli/commands/info.js#L26-L29
+  // Add a default of 'false' for the `save` field when the `ng-add` object is present but does not have any fields.
+  // There is a small chance this causes an incorrect value. However, the use of `ng-add` is rare and, in the cases
+  // it is used, save is set to either a `false` literal or a truthy value. Special cases can be added for specific
+  // packages if discovered.
+  if (typeof manifest['ng-add'] === 'object' && Object.keys(manifest['ng-add']).length === 0) {
+    manifest['ng-add'].save ??= false;
+  }
+
+  return manifest;
+}
+
+/**
+ * Parses the output of `yarn info` (classic) to get package metadata.
+ * @param stdout The standard output of the command.
+ * @param logger An optional logger instance.
+ * @returns The package metadata object.
+ */
+export function parseYarnClassicMetadata(stdout: string, logger?: Logger): PackageMetadata | null {
+  logger?.debug(`Parsing yarn classic metadata...`);
+  logStdout(stdout, logger);
+
+  if (!stdout) {
+    logger?.debug('  stdout is empty. No metadata found.');
+
+    return null;
+  }
+
+  const data = JSON.parse(stdout);
+
+  // Yarn classic wraps the metadata in a `data` property.
+  return data.data;
 }