bugfix incorrect type

Author: sokra

lib/watchEventSource.js

@@ -81,7 +81,9 @@ class DirectWatcher {
 class RecursiveWatcher {
 	constructor(rootPath) {
 		this.rootPath = rootPath;
+		/** @type {Map<Watcher, string>} */
 		this.mapWatcherToPath = new Map();
+		/** @type {Map<string, Set<Watcher>>} */
 		this.mapPathToWatchers = new Map();
 		this.watcher = undefined;
 		try {
@@ -137,7 +139,7 @@ class RecursiveWatcher {
 		if (!subpath) return;
 		this.mapWatcherToPath.delete(watcher);
 		const set = this.mapPathToWatchers.get(subpath);
-		set.delete(subpath);
+		set.delete(watcher);
 		if (set.size === 0) {
 			this.mapPathToWatchers.delete(subpath);
 		}