feat(@angular-devkit/build-angular): allow customization of output locations

This update introduces the ability for users to define the locations for storing `media`, `browser`, and `server` files.

You can achieve this by utilizing the extended `outputPath` option.
```json
{
  "projects": {
    "my-app": {
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:application",
          "options": {
            "outputPath": {
              "base": "dist/my-app",
              "browser": "",
              "server": "node-server",
              "media": "resources"
            }
          }
        }
      }
    }
  }
}
```

While not recommended, choosing to set the `browser` option empty will result in files being output directly under the specified `base` path. It's important to note that this action will generate certain files like `stats.json` and `prerendered-routes.json` that aren't intended for deployment in this directory.

Validation rules:
- `browser` and `server` are relative to the configuration set in the `base` option.
- When SSR is enabled, `browser` cannot be left empty.
- `media` is relative to the value specified in the `browser` option.
- Both `media` and `server` cannot be set to an empty strings.
- `browser`, `media`, or `server` can contain slashes.

Closes: angular#26632 and closes: angular#26057

Author: alan-agius4

goldens/public-api/angular_devkit/build_angular/index.md

@@ -46,7 +46,7 @@ export interface ApplicationBuilderOptions {
     namedChunks?: boolean;
     optimization?: OptimizationUnion_2;
     outputHashing?: OutputHashing_2;
-    outputPath: string;
+    outputPath: OutputPathUnion;
     poll?: number;
     polyfills?: string[];
     prerender?: PrerenderUnion;

packages/angular_devkit/build_angular/src/builders/application/build-action.ts

@@ -17,17 +17,18 @@ import { withNoProgress, withSpinner, writeResultFiles } from '../../tools/esbui
 import { deleteOutputDir } from '../../utils/delete-output-dir';
 import { shouldWatchRoot } from '../../utils/environment-options';
 import { NormalizedCachedOptions } from '../../utils/normalize-cache';
+import { NormalizedOutputPathOptions } from './options';
 
 export async function* runEsBuildBuildAction(
   action: (rebuildState?: RebuildState) => ExecutionResult | Promise<ExecutionResult>,
   options: {
     workspaceRoot: string;
     projectRoot: string;
-    outputPath: string;
+    outputPathOptions: NormalizedOutputPathOptions;
     logger: logging.LoggerApi;
     cacheOptions: NormalizedCachedOptions;
-    writeToFileSystem?: boolean;
-    writeToFileSystemFilter?: (file: BuildOutputFile) => boolean;
+    writeToFileSystem: boolean;
+    writeToFileSystemFilter: ((file: BuildOutputFile) => boolean) | undefined;
     watch?: boolean;
     verbose?: boolean;
     progress?: boolean;
@@ -39,13 +40,13 @@ export async function* runEsBuildBuildAction(
 ): AsyncIterable<(ExecutionResult['outputWithFiles'] | ExecutionResult['output']) & BuilderOutput> {
   const {
     writeToFileSystemFilter,
-    writeToFileSystem = true,
+    writeToFileSystem,
     watch,
     poll,
     logger,
     deleteOutputPath,
     cacheOptions,
-    outputPath,
+    outputPathOptions,
     verbose,
     projectRoot,
     workspaceRoot,
@@ -54,7 +55,7 @@ export async function* runEsBuildBuildAction(
   } = options;
 
   if (deleteOutputPath && writeToFileSystem) {
-    await deleteOutputDir(workspaceRoot, outputPath, ['browser', 'server']);
+    await deleteOutputDir(workspaceRoot, outputPathOptions);
   }
 
   const withProgress: typeof withSpinner = progress ? withSpinner : withNoProgress;
@@ -79,7 +80,7 @@ export async function* runEsBuildBuildAction(
 
     const ignored: string[] = [
       // Ignore the output and cache paths to avoid infinite rebuild cycles
-      outputPath,
+      outputPathOptions.base,
       cacheOptions.basePath,
       `${workspaceRoot.replace(/\\/g, '/')}/**/.*/**`,
     ];
@@ -137,7 +138,7 @@ export async function* runEsBuildBuildAction(
   // unit tests which execute the builder and modify the file system programmatically.
   if (writeToFileSystem) {
     // Write output files
-    await writeResultFiles(result.outputFiles, result.assetFiles, outputPath);
+    await writeResultFiles(result.outputFiles, result.assetFiles, outputPathOptions);
 
     yield result.output;
   } else {
@@ -191,7 +192,7 @@ export async function* runEsBuildBuildAction(
         const filesToWrite = writeToFileSystemFilter
           ? result.outputFiles.filter(writeToFileSystemFilter)
           : result.outputFiles;
-        await writeResultFiles(filesToWrite, result.assetFiles, outputPath);
+        await writeResultFiles(filesToWrite, result.assetFiles, outputPathOptions);
 
         yield result.output;
       } else {

packages/angular_devkit/build_angular/src/builders/application/index.ts

@@ -31,21 +31,38 @@ export async function* buildApplicationInternal(
   },
   extensions?: ApplicationBuilderExtensions,
 ): AsyncIterable<ApplicationBuilderOutput> {
+  const { workspaceRoot, logger, target } = context;
+
   // Check Angular version.
-  assertCompatibleAngularVersion(context.workspaceRoot);
+  assertCompatibleAngularVersion(workspaceRoot);
 
   // Purge old build disk cache.
   await purgeStaleBuildCache(context);
 
   // Determine project name from builder context target
-  const projectName = context.target?.project;
+  const projectName = target?.project;
   if (!projectName) {
-    context.logger.error(`The 'application' builder requires a target to be specified.`);
+    yield { success: false, error: `The 'application' builder requires a target to be specified.` };
 
     return;
   }
 
   const normalizedOptions = await normalizeOptions(context, projectName, options, extensions);
+  const writeToFileSystem = infrastructureSettings?.write ?? true;
+  const writeServerBundles = !!(normalizedOptions.ssrOptions && normalizedOptions.serverEntryPoint);
+
+  if (
+    writeToFileSystem &&
+    writeServerBundles &&
+    normalizedOptions.outputPathOptions.browser === ''
+  ) {
+    yield {
+      success: false,
+      error: `'outputPath.browser' cannot be configured to an empty string when SSR is enabled.`,
+    };
+
+    return;
+  }
 
   // Setup an abort controller with a builder teardown if no signal is present
   let signal = context.signal;
@@ -58,14 +75,11 @@ export async function* buildApplicationInternal(
   yield* runEsBuildBuildAction(
     async (rebuildState) => {
       const startTime = process.hrtime.bigint();
-
       const result = await executeBuild(normalizedOptions, context, rebuildState);
 
       const buildTime = Number(process.hrtime.bigint() - startTime) / 10 ** 9;
       const status = result.errors.length > 0 ? 'failed' : 'complete';
-      context.logger.info(
-        `Application bundle generation ${status}. [${buildTime.toFixed(3)} seconds]`,
-      );
+      logger.info(`Application bundle generation ${status}. [${buildTime.toFixed(3)} seconds]`);
 
       return result;
     },
@@ -75,19 +89,18 @@ export async function* buildApplicationInternal(
       poll: normalizedOptions.poll,
       deleteOutputPath: normalizedOptions.deleteOutputPath,
       cacheOptions: normalizedOptions.cacheOptions,
-      outputPath: normalizedOptions.outputPath,
+      outputPathOptions: normalizedOptions.outputPathOptions,
       verbose: normalizedOptions.verbose,
       projectRoot: normalizedOptions.projectRoot,
       workspaceRoot: normalizedOptions.workspaceRoot,
       progress: normalizedOptions.progress,
-      writeToFileSystem: infrastructureSettings?.write,
+      writeToFileSystem,
       // For app-shell and SSG server files are not required by users.
       // Omit these when SSR is not enabled.
-      writeToFileSystemFilter:
-        normalizedOptions.ssrOptions && normalizedOptions.serverEntryPoint
-          ? undefined
-          : (file) => file.type !== BuildOutputFileType.Server,
-      logger: context.logger,
+      writeToFileSystemFilter: writeServerBundles
+        ? undefined
+        : (file) => file.type !== BuildOutputFileType.Server,
+      logger,
       signal,
     },
   );

packages/angular_devkit/build_angular/src/builders/application/options.ts

@@ -23,8 +23,14 @@ import { normalizeCacheOptions } from '../../utils/normalize-cache';
 import { generateEntryPoints } from '../../utils/package-chunk-sort';
 import { findTailwindConfigurationFile } from '../../utils/tailwind';
 import { getIndexInputFile, getIndexOutputFile } from '../../utils/webpack-browser-config';
-import { Schema as ApplicationBuilderOptions, I18NTranslation, OutputHashing } from './schema';
+import {
+  Schema as ApplicationBuilderOptions,
+  I18NTranslation,
+  OutputHashing,
+  OutputPathClass,
+} from './schema';
 
+export type NormalizedOutputPathOptions = Required<OutputPathClass>;
 export type NormalizedApplicationBuildOptions = Awaited<ReturnType<typeof normalizeOptions>>;
 
 export interface ApplicationBuilderExtensions {
@@ -125,20 +131,31 @@ export async function normalizeOptions(
 
   const entryPoints = normalizeEntryPoints(workspaceRoot, options.browser, options.entryPoints);
   const tsconfig = path.join(workspaceRoot, options.tsConfig);
-  const outputPath = normalizeDirectoryPath(path.join(workspaceRoot, options.outputPath));
   const optimizationOptions = normalizeOptimization(options.optimization);
   const sourcemapOptions = normalizeSourceMaps(options.sourceMap ?? false);
   const assets = options.assets?.length
     ? normalizeAssetPatterns(options.assets, workspaceRoot, projectRoot, projectSourceRoot)
     : undefined;
 
+  const outputPath = options.outputPath;
+  const outputPathOptions: NormalizedOutputPathOptions = {
+    browser: 'browser',
+    server: 'server',
+    media: 'media',
+    ...(typeof outputPath === 'string' ? undefined : outputPath),
+    base: normalizeDirectoryPath(
+      path.join(workspaceRoot, typeof outputPath === 'string' ? outputPath : outputPath.base),
+    ),
+  };
+
   const outputNames = {
     bundles:
       options.outputHashing === OutputHashing.All || options.outputHashing === OutputHashing.Bundles
         ? '[name]-[hash]'
         : '[name]',
     media:
-      'media/' +
+      outputPathOptions.media +
+      '/' +
       (options.outputHashing === OutputHashing.All || options.outputHashing === OutputHashing.Media
         ? '[name]-[hash]'
         : '[name]'),
@@ -191,26 +208,6 @@ export async function normalizeOptions(
     }
   }
 
-  let tailwindConfiguration: { file: string; package: string } | undefined;
-  const tailwindConfigurationPath = await findTailwindConfigurationFile(workspaceRoot, projectRoot);
-  if (tailwindConfigurationPath) {
-    // Create a node resolver at the project root as a directory
-    const resolver = createRequire(projectRoot + '/');
-    try {
-      tailwindConfiguration = {
-        file: tailwindConfigurationPath,
-        package: resolver.resolve('tailwindcss'),
-      };
-    } catch {
-      const relativeTailwindConfigPath = path.relative(workspaceRoot, tailwindConfigurationPath);
-      context.logger.warn(
-        `Tailwind CSS configuration file found (${relativeTailwindConfigPath})` +
-          ` but the 'tailwindcss' package is not installed.` +
-          ` To enable Tailwind CSS, please install the 'tailwindcss' package.`,
-      );
-    }
-  }
-
   let indexHtmlOptions;
   // index can never have a value of `true` but in the schema it's of type `boolean`.
   if (typeof options.index !== 'boolean') {
@@ -318,7 +315,7 @@ export async function normalizeOptions(
     workspaceRoot,
     entryPoints,
     optimizationOptions,
-    outputPath,
+    outputPathOptions,
     outExtension,
     sourcemapOptions,
     tsconfig,
@@ -331,7 +328,7 @@ export async function normalizeOptions(
     serviceWorker:
       typeof serviceWorker === 'string' ? path.join(workspaceRoot, serviceWorker) : undefined,
     indexHtmlOptions,
-    tailwindConfiguration,
+    tailwindConfiguration: await getTailwindConfig(workspaceRoot, projectRoot, context),
     i18nOptions,
     namedChunks,
     budgets: budgets?.length ? budgets : undefined,
@@ -341,6 +338,36 @@ export async function normalizeOptions(
   };
 }
 
+async function getTailwindConfig(
+  workspaceRoot: string,
+  projectRoot: string,
+  context: BuilderContext,
+): Promise<{ file: string; package: string } | undefined> {
+  const tailwindConfigurationPath = await findTailwindConfigurationFile(workspaceRoot, projectRoot);
+
+  if (!tailwindConfigurationPath) {
+    return undefined;
+  }
+
+  // Create a node resolver at the project root as a directory
+  const resolver = createRequire(projectRoot + '/');
+  try {
+    return {
+      file: tailwindConfigurationPath,
+      package: resolver.resolve('tailwindcss'),
+    };
+  } catch {
+    const relativeTailwindConfigPath = path.relative(workspaceRoot, tailwindConfigurationPath);
+    context.logger.warn(
+      `Tailwind CSS configuration file found (${relativeTailwindConfigPath})` +
+        ` but the 'tailwindcss' package is not installed.` +
+        ` To enable Tailwind CSS, please install the 'tailwindcss' package.`,
+    );
+  }
+
+  return undefined;
+}
+
 /**
  * Normalize entry point options. To maintain compatibility with the legacy browser builder, we need a single `browser`
  * option which defines a single entry point. However, we also want to support multiple entry points as an internal option.

packages/angular_devkit/build_angular/src/builders/application/schema.json

@@ -220,8 +220,41 @@
       "default": []
     },
     "outputPath": {
-      "type": "string",
-      "description": "The full path for the new output directory, relative to the current workspace."
+      "description": "Specify the output path relative to workspace root.",
+      "oneOf": [
+        {
+          "type": "object",
+          "properties": {
+            "base": {
+              "type": "string",
+              "description": "Specify the output path relative to workspace root."
+            },
+            "browser": {
+              "type": "string",
+              "pattern": "^[-\\w\\.]*$",
+              "default": "browser",
+              "description": "The output directory name of your browser build, relative to the output root. Defaults to 'browser'."
+            },
+            "server": {
+              "type": "string",
+              "pattern": "^[-\\w\\.]+$",
+              "default": "server",
+              "description": "The output directory name of your server build, relative to the output root. Defaults to 'server'."
+            },
+            "media": {
+              "type": "string",
+              "pattern": "^[-\\w\\.]+$",
+              "default": "media",
+              "description": "The output directory name of your media files. This is relative to the browser directory. Defaults to 'media'."
+            }
+          },
+          "required": ["base"],
+          "additionalProperties": false
+        },
+        {
+          "type": "string"
+        }
+      ]
     },
     "aot": {
       "type": "boolean",