diff --git a/packages/angular/build/src/tools/esbuild/angular/component-stylesheets.ts b/packages/angular/build/src/tools/esbuild/angular/component-stylesheets.ts
index 7cfc6e91e9f2..dd1b3b704150 100644
--- a/packages/angular/build/src/tools/esbuild/angular/component-stylesheets.ts
+++ b/packages/angular/build/src/tools/esbuild/angular/component-stylesheets.ts
@@ -12,6 +12,7 @@ import { createContentHash } from '../../../utils/hash';
 import { BundleContextResult, BundlerContext } from '../bundler-context';
 import { type BuildOutputFile, BuildOutputFileType } from '../bundler-files';
 import { MemoryCache } from '../cache';
+import { MemoryLoadResultCache } from '../load-result-cache';
 import {
   BundleStylesheetOptions,
   createStylesheetBundleOptions,
@@ -30,11 +31,12 @@ export type ComponentStylesheetResult = BundleContextResult & {
 export class ComponentStylesheetBundler {
   readonly #fileContexts = new MemoryCache<BundlerContext>();
   readonly #inlineContexts = new MemoryCache<BundlerContext>();
+  readonly #loadCache = new MemoryLoadResultCache();
 
   /**
-   *
    * @param options An object containing the stylesheet bundling options.
-   * @param cache A load result cache to use when bundling.
+   * @param defaultInlineLanguage The default language to use for inline component styles.
+   * @param incremental True if incremental watch mode is enabled.
    */
   constructor(
     private readonly options: BundleStylesheetOptions,
@@ -54,29 +56,38 @@ export class ComponentStylesheetBundler {
     externalId?: string | boolean,
     direct?: boolean,
   ): Promise<ComponentStylesheetResult> {
-    const bundlerContext = await this.#fileContexts.getOrCreate(entry, () => {
-      return new BundlerContext(this.options.workspaceRoot, this.incremental, (loadCache) => {
-        const buildOptions = createStylesheetBundleOptions(this.options, loadCache);
-        if (externalId) {
-          assert(
-            typeof externalId === 'string',
-            'Initial external component stylesheets must have a string identifier',
-          );
-
-          buildOptions.entryPoints = { [externalId]: entry };
-          buildOptions.entryNames = '[name]';
-          delete buildOptions.publicPath;
-        } else {
-          buildOptions.entryPoints = [entry];
-        }
+    entry = path.normalize(entry);
 
-        // Angular encapsulation does not support nesting
-        // See: https://github.com/angular/angular/issues/58996
-        buildOptions.supported ??= {};
-        buildOptions.supported['nesting'] = false;
+    const bundlerContext = await this.#fileContexts.getOrCreate(entry, () => {
+      return new BundlerContext(
+        this.options.workspaceRoot,
+        this.incremental,
+        (loadCache) => {
+          const buildOptions = createStylesheetBundleOptions(this.options, loadCache);
+          if (externalId) {
+            assert(
+              typeof externalId === 'string',
+              'Initial external component stylesheets must have a string identifier',
+            );
+
+            buildOptions.entryPoints = { [externalId]: entry };
+            buildOptions.entryNames = '[name]';
+            delete buildOptions.publicPath;
+          } else {
+            buildOptions.entryPoints = [entry];
+          }
 
-        return buildOptions;
-      });
+          // Angular encapsulation does not support nesting
+          // See: https://github.com/angular/angular/issues/58996
+          buildOptions.supported ??= {};
+          buildOptions.supported['nesting'] = false;
+
+          return buildOptions;
+        },
+        /* useContext */ false,
+        /* initialFilter */ undefined,
+        this.#loadCache,
+      );
     });
 
     return this.extractResult(
@@ -101,6 +112,8 @@ export class ComponentStylesheetBundler {
     language = this.defaultInlineLanguage,
     externalId?: string,
   ): Promise<ComponentStylesheetResult> {
+    filename = path.normalize(filename);
+
     // Use a hash of the inline stylesheet content to ensure a consistent identifier. External stylesheets will resolve
     // to the actual stylesheet file path.
     const hasher = createContentHash();
@@ -112,48 +125,55 @@ export class ComponentStylesheetBundler {
     const bundlerContext = await this.#inlineContexts.getOrCreate(entry, () => {
       const namespace = 'angular:styles/component';
 
-      return new BundlerContext(this.options.workspaceRoot, this.incremental, (loadCache) => {
-        const buildOptions = createStylesheetBundleOptions(this.options, loadCache, {
-          [entry]: data,
-        });
-        if (externalId) {
-          buildOptions.entryPoints = { [externalId]: `${namespace};${entry}` };
-          buildOptions.entryNames = '[name]';
-          delete buildOptions.publicPath;
-        } else {
-          buildOptions.entryPoints = [`${namespace};${entry}`];
-        }
+      return new BundlerContext(
+        this.options.workspaceRoot,
+        this.incremental,
+        (loadCache) => {
+          const buildOptions = createStylesheetBundleOptions(this.options, loadCache, {
+            [entry]: data,
+          });
+          if (externalId) {
+            buildOptions.entryPoints = { [externalId]: `${namespace};${entry}` };
+            buildOptions.entryNames = '[name]';
+            delete buildOptions.publicPath;
+          } else {
+            buildOptions.entryPoints = [`${namespace};${entry}`];
+          }
 
-        // Angular encapsulation does not support nesting
-        // See: https://github.com/angular/angular/issues/58996
-        buildOptions.supported ??= {};
-        buildOptions.supported['nesting'] = false;
-
-        buildOptions.plugins.push({
-          name: 'angular-component-styles',
-          setup(build) {
-            build.onResolve({ filter: /^angular:styles\/component;/ }, (args) => {
-              if (args.kind !== 'entry-point') {
-                return null;
-              }
-
-              return {
-                path: entry,
-                namespace,
-              };
-            });
-            build.onLoad({ filter: /^css;/, namespace }, () => {
-              return {
-                contents: data,
-                loader: 'css',
-                resolveDir: path.dirname(filename),
-              };
-            });
-          },
-        });
-
-        return buildOptions;
-      });
+          // Angular encapsulation does not support nesting
+          // See: https://github.com/angular/angular/issues/58996
+          buildOptions.supported ??= {};
+          buildOptions.supported['nesting'] = false;
+
+          buildOptions.plugins.push({
+            name: 'angular-component-styles',
+            setup(build) {
+              build.onResolve({ filter: /^angular:styles\/component;/ }, (args) => {
+                if (args.kind !== 'entry-point') {
+                  return null;
+                }
+
+                return {
+                  path: entry,
+                  namespace,
+                };
+              });
+              build.onLoad({ filter: /^css;/, namespace }, () => {
+                return {
+                  contents: data,
+                  loader: 'css',
+                  resolveDir: path.dirname(filename),
+                };
+              });
+            },
+          });
+
+          return buildOptions;
+        },
+        /* useContext */ false,
+        /* initialFilter */ undefined,
+        this.#loadCache,
+      );
     });
 
     // Extract the result of the bundling from the output files
@@ -170,13 +190,20 @@ export class ComponentStylesheetBundler {
    * @param files The group of files that have been modified
    * @returns An array of file based stylesheet entries if any were invalidated; otherwise, undefined.
    */
-  invalidate(files: Iterable<string>): string[] | undefined {
+  invalidate(files: Iterable<string> | ReadonlySet<string>): string[] | undefined {
     if (!this.incremental) {
       return;
     }
 
-    const normalizedFiles = [...files].map(path.normalize);
-    const normalizedFilesSet = new Set(normalizedFiles);
+    const normalizedFiles = new Set<string>();
+    for (const file of files) {
+      const normalized = path.normalize(file);
+      normalizedFiles.add(normalized);
+      if (!path.isAbsolute(normalized)) {
+        normalizedFiles.add(path.normalize(path.join(this.options.workspaceRoot, normalized)));
+      }
+    }
+
     let entries: string[] | undefined;
 
     for (const [entry, bundler] of this.#fileContexts.entries()) {
@@ -190,7 +217,7 @@ export class ComponentStylesheetBundler {
       const firstSemi = entry.indexOf(';');
       const secondSemi = firstSemi !== -1 ? entry.indexOf(';', firstSemi + 1) : -1;
       const filename = secondSemi !== -1 ? entry.slice(secondSemi + 1) : '';
-      if (filename && normalizedFilesSet.has(path.normalize(filename))) {
+      if (filename && normalizedFiles.has(path.normalize(filename))) {
         this.#inlineContexts.delete(entry);
         void bundler.dispose();
       } else {
@@ -214,6 +241,7 @@ export class ComponentStylesheetBundler {
     const contexts = [...this.#fileContexts.values(), ...this.#inlineContexts.values()];
     this.#fileContexts.clear();
     this.#inlineContexts.clear();
+    this.#loadCache.clear();
 
     await Promise.allSettled(contexts.map((context) => context.dispose()));
   }
@@ -268,14 +296,18 @@ export class ComponentStylesheetBundler {
       }
     }
 
-    const { metafile } = result;
-    // Remove entryPoint fields from outputs to prevent the internal component styles from being
-    // treated as initial files. Also mark the entry as a component resource for stat reporting.
-    Object.values(metafile.outputs).forEach((output) => {
-      delete output.entryPoint;
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      (output as any)['ng-component'] = true;
-    });
+    // Clone metafile to prevent mutation of the cached result by downstream plugins
+    const metafile = {
+      inputs: { ...result.metafile.inputs },
+      outputs: Object.fromEntries(
+        Object.entries(result.metafile.outputs).map(([key, output]) => {
+          const cloned = { ...output, ['ng-component']: true };
+          delete cloned.entryPoint;
+
+          return [key, cloned];
+        }),
+      ),
+    };
 
     return {
       errors,
diff --git a/packages/angular/build/src/tools/esbuild/bundler-context.ts b/packages/angular/build/src/tools/esbuild/bundler-context.ts
index 865ff301a214..b335a1160ba6 100644
--- a/packages/angular/build/src/tools/esbuild/bundler-context.ts
+++ b/packages/angular/build/src/tools/esbuild/bundler-context.ts
@@ -106,7 +106,7 @@ export class BundlerContext {
 
   static bundleAll(
     contexts: Iterable<BundlerContext>,
-    changedFiles?: Iterable<string>,
+    changedFiles?: Iterable<string> | ReadonlySet<string>,
   ): Promise<BundleContextResult[]> {
     return Promise.all(
       [...contexts].map((context) => {
@@ -482,18 +482,72 @@ export class BundlerContext {
    * to be stored.
    * @returns True, if the result was invalidated; False, otherwise.
    */
-  invalidate(files: Iterable<string>): boolean {
+  invalidate(files: Iterable<string> | ReadonlySet<string>): boolean {
     if (!this.incremental) {
       return false;
     }
 
-    let invalid = false;
-    for (const file of files) {
-      const normalizedFile = isAbsolute(file) ? normalize(file) : join(this.workspaceRoot, file);
+    let candidateFiles: ReadonlySet<string>;
+    if (files instanceof Set) {
+      let isCandidateReady = true;
+      for (const file of files) {
+        if (
+          file !== normalize(file) ||
+          (!isAbsolute(file) && !files.has(normalize(join(this.workspaceRoot, file))))
+        ) {
+          isCandidateReady = false;
+          break;
+        }
+      }
+
+      if (isCandidateReady) {
+        candidateFiles = files;
+      } else {
+        const normalizedFiles = new Set<string>();
+        for (const file of files) {
+          const normalized = normalize(file);
+          normalizedFiles.add(normalized);
+          if (!isAbsolute(normalized)) {
+            normalizedFiles.add(normalize(join(this.workspaceRoot, normalized)));
+          }
+        }
+        candidateFiles = normalizedFiles;
+      }
+    } else {
+      const normalizedFiles = new Set<string>();
+      for (const file of files) {
+        const normalized = normalize(file);
+        normalizedFiles.add(normalized);
+        if (!isAbsolute(normalized)) {
+          normalizedFiles.add(normalize(join(this.workspaceRoot, normalized)));
+        }
+      }
+      candidateFiles = normalizedFiles;
+    }
 
-      this.#loadCache?.invalidate(normalizedFile);
+    let invalid = false;
+    for (const file of candidateFiles) {
+      if (this.#loadCache?.invalidate(file)) {
+        invalid = true;
+      }
+    }
 
-      invalid ||= this.watchFiles.has(normalizedFile);
+    if (!invalid) {
+      if (this.watchFiles.size < candidateFiles.size) {
+        for (const file of this.watchFiles) {
+          if (candidateFiles.has(file)) {
+            invalid = true;
+            break;
+          }
+        }
+      } else {
+        for (const file of candidateFiles) {
+          if (this.watchFiles.has(file)) {
+            invalid = true;
+            break;
+          }
+        }
+      }
     }
 
     if (invalid) {
diff --git a/packages/angular/build/src/tools/esbuild/bundler-context_spec.ts b/packages/angular/build/src/tools/esbuild/bundler-context_spec.ts
new file mode 100644
index 000000000000..213354389122
--- /dev/null
+++ b/packages/angular/build/src/tools/esbuild/bundler-context_spec.ts
@@ -0,0 +1,113 @@
+/**
+ * @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 { BundlerContext } from './bundler-context';
+import { MemoryLoadResultCache } from './load-result-cache';
+
+describe('BundlerContext', () => {
+  describe('invalidate', () => {
+    it('should return false when incremental is disabled', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ false, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/app.css');
+
+      expect(context.invalidate(['/workspace/src/app.css'])).toBeFalse();
+    });
+
+    it('should return true when a watch file matches changed files as an array', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/app.css');
+
+      expect(context.invalidate(['/workspace/src/app.css'])).toBeTrue();
+    });
+
+    it('should return true when a watch file matches changed files as a ReadonlySet', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/app.css');
+
+      const changedSet: ReadonlySet<string> = new Set(['/workspace/src/app.css']);
+      expect(context.invalidate(changedSet)).toBeTrue();
+    });
+
+    it('should return false when changed files do not intersect with watchFiles', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/app.css');
+
+      expect(context.invalidate(['/workspace/src/other.css'])).toBeFalse();
+    });
+
+    it('should correctly handle relative changed file paths', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/app.css');
+
+      expect(context.invalidate(['src/app.css'])).toBeTrue();
+    });
+
+    it('should correctly handle relative paths inside a ReadonlySet', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/app.css');
+
+      const set: ReadonlySet<string> = new Set(['src/app.css']);
+      expect(context.invalidate(set)).toBeTrue();
+    });
+
+    it('should invalidate shared load cache when files change', async () => {
+      const loadCache = new MemoryLoadResultCache();
+      await loadCache.put('file:/workspace/src/app.css', {
+        contents: 'body {}',
+        loader: 'css',
+        watchFiles: ['/workspace/src/app.css'],
+      });
+
+      const context = new BundlerContext(
+        '/workspace',
+        /* incremental */ true,
+        () => ({ entryPoints: ['main.js'] }),
+        /* useContext */ false,
+        /* initialFilter */ undefined,
+        loadCache,
+      );
+
+      expect(loadCache.get('file:/workspace/src/app.css')).toBeDefined();
+      expect(context.invalidate(['/workspace/src/app.css'])).toBeTrue();
+      expect(loadCache.get('file:/workspace/src/app.css')).toBeUndefined();
+    });
+
+    it('should work when watchFiles is smaller than changed files', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      context.watchFiles.add('/workspace/src/file10.css');
+
+      const changedFiles = Array.from({ length: 100 }, (_, i) => `/workspace/src/file${i}.css`);
+      expect(context.invalidate(new Set(changedFiles))).toBeTrue();
+    });
+
+    it('should work when changed files is smaller than watchFiles', () => {
+      const context = new BundlerContext('/workspace', /* incremental */ true, () => ({
+        entryPoints: ['main.js'],
+      }));
+      for (let i = 0; i < 100; i++) {
+        context.watchFiles.add(`/workspace/src/file${i}.css`);
+      }
+
+      expect(context.invalidate(new Set(['/workspace/src/file50.css']))).toBeTrue();
+    });
+  });
+});