feat(@angular-devkit/build-angular): add externalDependencies to the esbuild browser builder

This commit add a new `externalDependencies` option to the experimental browser builder.

Dependencies listed in this option will not be included in the final bundle, instead the user would need to provide them at runtime using import maps or another method.

Closes angular#23322

Author: alan-agius4

packages/angular_devkit/build_angular/BUILD.bazel

@@ -22,6 +22,11 @@ ts_json_schema(
     src = "src/builders/browser/schema.json",
 )
 
+ts_json_schema(
+    name = "browser_esbuild_schema",
+    src = "src/builders/browser-esbuild/schema.json",
+)
+
 ts_json_schema(
     name = "dev_server_schema",
     src = "src/builders/dev-server/schema.json",
@@ -70,6 +75,7 @@ ts_library(
     ) + [
         "//packages/angular_devkit/build_angular:src/builders/app-shell/schema.ts",
         "//packages/angular_devkit/build_angular:src/builders/browser/schema.ts",
+        "//packages/angular_devkit/build_angular:src/builders/browser-esbuild/schema.ts",
         "//packages/angular_devkit/build_angular:src/builders/dev-server/schema.ts",
         "//packages/angular_devkit/build_angular:src/builders/extract-i18n/schema.ts",
         "//packages/angular_devkit/build_angular:src/builders/karma/schema.ts",

packages/angular_devkit/build_angular/builders.json

@@ -13,7 +13,7 @@
     },
     "browser-esbuild": {
       "implementation": "./src/builders/browser-esbuild",
-      "schema": "./src/builders/browser/schema.json",
+      "schema": "./src/builders/browser-esbuild/schema.json",
       "description": "Build a browser application."
     },
     "dev-server": {

packages/angular_devkit/build_angular/src/builders/browser-esbuild/index.ts

@@ -20,11 +20,11 @@ import { generateEntryPoints } from '../../utils/package-chunk-sort';
 import { augmentAppWithServiceWorker } from '../../utils/service-worker';
 import { getIndexInputFile, getIndexOutputFile } from '../../utils/webpack-browser-config';
 import { resolveGlobalStyles } from '../../webpack/configs';
-import { Schema as BrowserBuilderOptions, SourceMapClass } from '../browser/schema';
 import { createCompilerPlugin } from './compiler-plugin';
 import { DEFAULT_OUTDIR, bundle, logMessages } from './esbuild';
 import { logExperimentalWarnings } from './experimental-warnings';
 import { normalizeOptions } from './options';
+import { Schema as BrowserBuilderOptions, SourceMapClass } from './schema';
 import { bundleStylesheetText } from './stylesheets';
 
 /**
@@ -35,7 +35,7 @@ import { bundleStylesheetText } from './stylesheets';
  * @returns A promise with the builder result output
  */
 // eslint-disable-next-line max-lines-per-function
-export async function execute(
+export async function buildEsbuildBrowser(
   options: BrowserBuilderOptions,
   context: BuilderContext,
 ): Promise<BuilderOutput> {
@@ -312,6 +312,7 @@ async function bundleCode(
     sourcemap: sourcemapOptions.scripts && (sourcemapOptions.hidden ? 'external' : true),
     splitting: true,
     tsconfig,
+    external: options.externalDependencies,
     write: false,
     platform: 'browser',
     preserveSymlinks: options.preserveSymlinks,
@@ -339,4 +340,4 @@ async function bundleCode(
   });
 }
 
-export default createBuilder(execute);
+export default createBuilder(buildEsbuildBrowser);