feat: Add option to modify chokidar watchOptions with @web/dev-server

Author: Matsuuu

packages/dev-server-core/src/server/DevServer.ts

@@ -18,7 +18,7 @@ export class DevServer {
   constructor(
     public config: DevServerCoreConfig,
     public logger: Logger,
-    public fileWatcher = chokidar.watch([]),
+    public fileWatcher = chokidar.watch([], config.chokidarOptions),
   ) {
     if (!config) throw new Error('Missing config.');
     if (!logger) throw new Error('Missing logger.');

packages/dev-server-core/src/server/DevServerCoreConfig.ts

@@ -1,6 +1,7 @@
 import { Middleware } from 'koa';
 import { Plugin } from '../plugins/Plugin';
 import { Server } from 'net';
+import chokidar from 'chokidar';
 
 export type MimeTypeMappings = Record<string, string>;
 
@@ -67,4 +68,9 @@ export interface DevServerCoreConfig {
    * Useful when you want more control over when files are build (e.g. when doing a test run using @web/test-runner).
    */
   disableFileWatcher?: boolean;
+
+  /**
+   * Additional options you want to provide to chokidar file watcher
+   */
+  chokidarOptions?: chokidar.WatchOptions;
 }

packages/dev-server/src/config/parseConfig.ts

@@ -16,6 +16,7 @@ const defaultConfig: Partial<DevServerConfig> = {
   clearTerminalOnReload: true,
   middleware: [],
   plugins: [],
+  chokidarOptions: {},
 };
 
 function validate(config: Record<string, unknown>, key: string, type: string) {