Fix:Include Watcher as lib with no dependencies and fix tiny-readdir bug #610

server/libs/watcher/promise-concurrency-limiter.js

@@ -0,0 +1,41 @@
+"use strict";
+/* IMPORT */
+/* PROMISE CONCURRENCY LIMITER */
+class Limiter {
+  /* CONSTRUCTOR */
+  constructor(options) {
+    this.concurrency = options.concurrency;
+    this.count = 0;
+    this.queue = new Set();
+  }
+  /* API */
+  add(fn) {
+    if (this.count < this.concurrency)
+      return this.run(fn);
+    return new Promise(resolve => {
+      const callback = () => resolve(this.run(fn));
+      this.queue.add(callback);
+    });
+  }
+  flush() {
+    for (const callback of this.queue) {
+      if (this.count >= this.concurrency)
+        break;
+      this.queue.delete(callback);
+      callback();
+    }
+  }
+  run(fn) {
+    this.count += 1;
+    const promise = fn();
+    const cleanup = () => {
+      this.count -= 1;
+      this.flush();
+    };
+    promise.then(cleanup, cleanup);
+    return promise;
+  }
+}
+module.exports = Limiter;
+module.exports.default = Limiter;
+Object.defineProperty(module.exports, "__esModule", { value: true });