feat(@angular-devkit/build-angular): allow poll override in dev-server

packages/angular_devkit/build_angular/src/dev-server/index.ts

@@ -52,6 +52,7 @@ export interface DevServerBuilderOptions {
   hmrWarning: boolean;
   servePathDefaultWarning: boolean;
 
+  // These options come from the browser builder and are provided here for convenience.
   optimization?: boolean;
   aot?: boolean;
   sourceMap?: boolean;
@@ -60,6 +61,7 @@ export interface DevServerBuilderOptions {
   commonChunk?: boolean;
   baseHref?: string;
   progress?: boolean;
+  poll?: number;
 }
 
 interface WebpackDevServerConfigurationOptions {
@@ -450,6 +452,7 @@ export class DevServerBuilder implements Builder<DevServerBuilderOptions> {
       ...(options.commonChunk !== undefined ? { commonChunk: options.commonChunk } : {}),
       ...(options.baseHref !== undefined ? { baseHref: options.baseHref } : {}),
       ...(options.progress !== undefined ? { progress: options.progress } : {}),
+      ...(options.poll !== undefined ? { poll: options.poll } : {}),
 
       ...builderConfig.options,
     };

packages/angular_devkit/build_angular/src/dev-server/schema.json

@@ -117,6 +117,10 @@
     "progress": {
       "type": "boolean",
       "description": "Log progress to the console while building."
+    },
+    "poll": {
+      "type": "number",
+      "description": "Enable and define the file watching poll time period in milliseconds."
     }
   },
   "additionalProperties": false,