Added FSWatcher and StatWatcher

package.json

@@ -49,6 +49,7 @@
 		"@types/node": "^20.12.5",
 		"@types/readable-stream": "^4.0.10",
 		"buffer": "^6.0.3",
+		"eventemitter3": "^5.0.1",
 		"minimatch": "^9.0.3",
 		"readable-stream": "^4.5.2",
 		"utilium": "^0.4.0"

src/emulation/watchers.ts

@@ -0,0 +1,57 @@
+import { EventEmitter } from 'eventemitter3';
+import type { EventEmitter as NodeEventEmitter } from 'node:events';
+import type * as fs from 'node:fs';
+import { ErrnoError } from '../error.js';
+
+class Watcher<TEvents extends Record<string, unknown[]> = Record<string, unknown[]>> extends EventEmitter<TEvents> implements NodeEventEmitter {
+	/* eslint-disable @typescript-eslint/no-explicit-any */
+	public off<T extends EventEmitter.EventNames<TEvents>>(event: T, fn?: ((...args: any[]) => void) | undefined, context?: any, once?: boolean | undefined): this {
+		return super.off<T>(event, fn as EventEmitter.EventListener<TEvents, T>, context, once);
+	}
+
+	public removeListener<T extends EventEmitter.EventNames<TEvents>>(event: T, fn?: ((...args: any[]) => void) | undefined, context?: any, once?: boolean | undefined): this {
+		return super.removeListener<T>(event, fn as EventEmitter.EventListener<TEvents, T>, context, once);
+	}
+	/* eslint-enable @typescript-eslint/no-explicit-any */
+
+	public setMaxListeners(): never {
+		throw ErrnoError.With('ENOTSUP');
+	}
+
+	public getMaxListeners(): never {
+		throw ErrnoError.With('ENOTSUP');
+	}
+
+	public prependListener(): never {
+		throw ErrnoError.With('ENOTSUP');
+	}
+
+	public prependOnceListener(): never {
+		throw ErrnoError.With('ENOTSUP');
+	}
+
+	public rawListeners(): never {
+		throw ErrnoError.With('ENOTSUP');
+	}
+
+	public ref(): this {
+		return this;
+	}
+
+	public unref(): this {
+		return this;
+	}
+}
+
+export class FSWatcher
+	extends Watcher<{
+		change: [eventType: string, filename: string | Buffer];
+		close: [];
+		error: [error: Error];
+	}>
+	implements fs.FSWatcher
+{
+	public close(): void {}
+}
+
+export class StatWatcher extends Watcher implements fs.StatWatcher {}