fix(@angular-devkit/build-angular): Allow for config of ngsw-config.json path.

fixes angular/angular-cli#10357

Author: Brocco

packages/angular_devkit/build_angular/src/angular-cli-files/utilities/service-worker/index.ts

@@ -94,6 +94,7 @@ export function augmentAppWithServiceWorker(
   appRoot: Path,
   outputPath: Path,
   baseHref: string,
+  ngswConfigPath?: string,
 ): Promise<void> {
   // Path to the worker script itself.
   const distPath = normalize(outputPath);
@@ -105,7 +106,7 @@ export function augmentAppWithServiceWorker(
     '@angular/service-worker/config',
   );
   const safetyPath = join(dirname(workerPath), 'safety-worker.js');
-  const configPath = join(appRoot, 'ngsw-config.json');
+  const configPath = ngswConfigPath as Path || join(appRoot, 'ngsw-config.json');
 
   return host.exists(configPath).pipe(
     switchMap(exists => {

packages/angular_devkit/build_angular/src/browser/index.ts

@@ -111,6 +111,7 @@ export class BrowserBuilder implements Builder<BrowserBuilderSchema> {
                 projectRoot,
                 resolve(root, normalize(options.outputPath)),
                 options.baseHref || '/',
+                options.ngswConfigPath,
               ).then(
                 () => {
                   obs.next({ success: !stats.hasErrors() });

packages/angular_devkit/build_angular/src/browser/schema.d.ts

@@ -181,6 +181,11 @@ export interface BrowserBuilderSchema {
    */
   serviceWorker: boolean;
 
+  /**
+   * Path to ngsw-config.json.
+   */
+  ngswConfigPath?: string;
+
   /**
    * Flag to prevent building an app shell.
    */

packages/angular_devkit/build_angular/src/browser/schema.json

@@ -194,6 +194,10 @@
       "description": "Generates a service worker config for production builds.",
       "default": false
     },
+    "ngswConfigPath": {
+      "type": "string",
+      "description": "Path to ngsw-config.json."
+    },
     "skipAppShell": {
       "type": "boolean",
       "description": "Flag to prevent building an app shell.",