fix(@angular/cli): remove algoliasearch dependency and support latest docs versions

Eliminate the client library dependency on `algoliasearch` by replacing the Algolia query calls with native `fetch` requests. This removes 15 transitively installed npm packages from the CLI dependencies.
Also, bump `LATEST_KNOWN_DOCS_VERSION` to 22 and add a unit test suite to verify the documentation search and fallback version logic.

Author: clydin

packages/angular/cli/BUILD.bazel

@@ -61,7 +61,6 @@ ts_project(
         ":node_modules/@inquirer/prompts",
         ":node_modules/@listr2/prompt-adapter-inquirer",
         ":node_modules/@modelcontextprotocol/sdk",
-        ":node_modules/algoliasearch",
         ":node_modules/jsonc-parser",
         ":node_modules/listr2",
         ":node_modules/npm-package-arg",

packages/angular/cli/package.json

@@ -19,7 +19,6 @@
     "@listr2/prompt-adapter-inquirer": "4.2.4",
     "@modelcontextprotocol/sdk": "1.29.0",
     "@schematics/angular": "workspace:0.0.0-PLACEHOLDER",
-    "algoliasearch": "5.55.2",
     "jsonc-parser": "3.3.1",
     "listr2": "10.2.2",
     "npm-package-arg": "14.0.0",

packages/angular/cli/src/commands/mcp/tools/doc-search.ts

@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-import type { LegacySearchMethodProps, SearchResponse } from 'algoliasearch';
 import { createDecipheriv } from 'node:crypto';
 import { Readable } from 'node:stream';
 import { z } from 'zod';
@@ -32,7 +31,7 @@ const MIN_SUPPORTED_DOCS_VERSION = 17;
  * condition where a newly released CLI might default to searching for a documentation index that
  * doesn't exist yet.
  */
-const LATEST_KNOWN_DOCS_VERSION = 20;
+const LATEST_KNOWN_DOCS_VERSION = 22;
 
 const docSearchInputSchema = z.object({
   query: z
@@ -99,41 +98,74 @@ Searches the official Angular documentation (angular.dev) to answer questions ab
 });
 
 function createDocSearchHandler({ logger }: McpToolContext) {
-  let client: import('algoliasearch').SearchClient | undefined;
+  let apiKey: string | undefined;
 
-  return async ({ query, includeTopContent, version }: DocSearchInput) => {
-    if (!client) {
+  async function performSearch(query: string, version: number) {
+    if (!apiKey) {
       const dcip = createDecipheriv(
         'aes-256-gcm',
         (k1 + ALGOLIA_APP_ID).padEnd(32, '^'),
         iv,
       ).setAuthTag(Buffer.from(at, 'base64'));
-      const { searchClient } = await import('algoliasearch');
-      client = searchClient(
-        ALGOLIA_APP_ID,
-        dcip.update(ALGOLIA_API_E, 'hex', 'utf-8') + dcip.final('utf-8'),
-      );
+      apiKey = dcip.update(ALGOLIA_API_E, 'hex', 'utf-8') + dcip.final('utf-8');
+    }
+
+    const url = `https://${ALGOLIA_APP_ID}-dsn.algolia.net/1/indexes/angular_v${version}/query`;
+    const response = await fetch(url, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Algolia-Application-Id': ALGOLIA_APP_ID,
+        'X-Algolia-API-Key': apiKey,
+      },
+      body: JSON.stringify({
+        query,
+        attributesToRetrieve: [
+          'hierarchy.lvl0',
+          'hierarchy.lvl1',
+          'hierarchy.lvl2',
+          'hierarchy.lvl3',
+          'hierarchy.lvl4',
+          'hierarchy.lvl5',
+          'hierarchy.lvl6',
+          'content',
+          'type',
+          'url',
+        ],
+        hitsPerPage: 10,
+      }),
+    });
+
+    if (!response.ok) {
+      throw new Error(`Search request failed: ${response.statusText}`);
     }
 
+    const data = (await response.json()) as { hits: Record<string, unknown>[] };
+
+    return data.hits;
+  }
+
+  return async ({ query, includeTopContent, version }: DocSearchInput) => {
     let finalSearchedVersion = Math.max(
       version ?? LATEST_KNOWN_DOCS_VERSION,
       MIN_SUPPORTED_DOCS_VERSION,
     );
-    let searchResults;
+
+    let allHits: Record<string, unknown>[] | undefined;
     try {
-      searchResults = await client.search(createSearchArguments(query, finalSearchedVersion));
+      allHits = await performSearch(query, finalSearchedVersion);
     } catch {}
 
     // If the initial search for a newer-than-stable version returns no results, it may be because
     // the index for that version doesn't exist yet. In this case, fall back to the latest known
     // stable version.
-    if (!searchResults && finalSearchedVersion > LATEST_KNOWN_DOCS_VERSION) {
+    if ((!allHits || allHits.length === 0) && finalSearchedVersion > LATEST_KNOWN_DOCS_VERSION) {
       finalSearchedVersion = LATEST_KNOWN_DOCS_VERSION;
-      searchResults = await client.search(createSearchArguments(query, finalSearchedVersion));
+      try {
+        allHits = await performSearch(query, finalSearchedVersion);
+      } catch {}
     }
 
-    const allHits = searchResults?.results.flatMap((result) => (result as SearchResponse).hits);
-
     if (!allHits?.length) {
       return {
         content: [
@@ -282,38 +314,3 @@ function formatHitToParts(hit: Record<string, unknown>): { title: string; breadc
 
   return { title, breadcrumb };
 }
-
-/**
- * Creates the search arguments for an Algolia search.
- *
- * The arguments are based on the search implementation in `adev`.
- *
- * @param query The search query string.
- * @returns The search arguments for the Algolia client.
- */
-function createSearchArguments(query: string, version: number): LegacySearchMethodProps {
-  // Search arguments are based on adev's search service:
-  // https://github.com/angular/angular/blob/4b614fbb3263d344dbb1b18fff24cb09c5a7582d/adev/shared-docs/services/search.service.ts#L58
-  return [
-    {
-      indexName: `angular_v${version}`,
-      params: {
-        query,
-        attributesToRetrieve: [
-          'hierarchy.lvl0',
-          'hierarchy.lvl1',
-          'hierarchy.lvl2',
-          'hierarchy.lvl3',
-          'hierarchy.lvl4',
-          'hierarchy.lvl5',
-          'hierarchy.lvl6',
-          'content',
-          'type',
-          'url',
-        ],
-        hitsPerPage: 10,
-      },
-      type: 'default',
-    },
-  ];
-}

packages/angular/cli/src/commands/mcp/tools/doc-search_spec.ts

@@ -0,0 +1,107 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import { createMockContext } from '../testing/test-utils';
+import { DOC_SEARCH_TOOL } from './doc-search';
+
+describe('Doc Search Tool', () => {
+  let mockContext: ReturnType<typeof createMockContext>['context'];
+  let fetchSpy: jasmine.Spy;
+
+  beforeEach(() => {
+    const { context } = createMockContext();
+    mockContext = context;
+
+    fetchSpy = spyOn(globalThis, 'fetch');
+  });
+
+  it('should query the correct Algolia endpoint with headers and payload', async () => {
+    fetchSpy.and.resolveTo(
+      new Response(
+        JSON.stringify({
+          hits: [
+            {
+              hierarchy: {
+                lvl0: 'Docs',
+                lvl1: 'Standalone Components',
+              },
+              url: 'https://angular.dev/guide/standalone-components',
+            },
+          ],
+        }),
+        { status: 200, statusText: 'OK' },
+      ),
+    );
+
+    const handler = DOC_SEARCH_TOOL.factory(mockContext);
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const result = await (handler as any)({
+      query: 'standalone',
+      version: 22,
+    });
+
+    expect(fetchSpy).toHaveBeenCalledTimes(1);
+    const [calledUrl, calledInit] = fetchSpy.calls.first().args;
+    expect(calledUrl).toBe('https://L1XWT2UJ7F-dsn.algolia.net/1/indexes/angular_v22/query');
+    expect(calledInit.method).toBe('POST');
+    expect(calledInit.headers['X-Algolia-Application-Id']).toBe('L1XWT2UJ7F');
+    expect(calledInit.headers['X-Algolia-API-Key']).toBeDefined();
+
+    const body = JSON.parse(calledInit.body);
+    expect(body.query).toBe('standalone');
+
+    expect(result.structuredContent.searchedVersion).toBe(22);
+    expect(result.structuredContent.results.length).toBe(1);
+    expect(result.structuredContent.results[0].title).toBe('Standalone Components');
+  });
+
+  it('should fallback to latest known version if initial search returns no hits', async () => {
+    // First call returns empty hits
+    fetchSpy.and.returnValues(
+      Promise.resolve(
+        new Response(JSON.stringify({ hits: [] }), { status: 200, statusText: 'OK' }),
+      ),
+      // Second fallback call returns a hit
+      Promise.resolve(
+        new Response(
+          JSON.stringify({
+            hits: [
+              {
+                hierarchy: {
+                  lvl0: 'Docs',
+                  lvl1: 'Fallback Guide',
+                },
+                url: 'https://angular.dev/guide/fallback',
+              },
+            ],
+          }),
+          { status: 200, statusText: 'OK' },
+        ),
+      ),
+    );
+
+    const handler = DOC_SEARCH_TOOL.factory(mockContext);
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const result = await (handler as any)({
+      query: 'some-query',
+      version: 24,
+    });
+
+    expect(fetchSpy).toHaveBeenCalledTimes(2);
+    expect(fetchSpy.calls.first().args[0]).toBe(
+      'https://L1XWT2UJ7F-dsn.algolia.net/1/indexes/angular_v24/query',
+    );
+    expect(fetchSpy.calls.mostRecent().args[0]).toBe(
+      'https://L1XWT2UJ7F-dsn.algolia.net/1/indexes/angular_v22/query',
+    );
+
+    expect(result.structuredContent.searchedVersion).toBe(22);
+    expect(result.structuredContent.results.length).toBe(1);
+    expect(result.structuredContent.results[0].title).toBe('Fallback Guide');
+  });
+});