node_modules

1 files changed, 75 insertions, 0 deletions

diff --git a/node_modules/fbjs/lib/Deferred.js.flow b/node_modules/fbjs/lib/Deferred.js.flow
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+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule Deferred
+ * @typechecks
+ * @flow
+ */
+
+/**
+ * Deferred provides a Promise-like API that exposes methods to resolve and
+ * reject the Promise. It is most useful when converting non-Promise code to use
+ * Promises.
+ *
+ * If you want to export the Promise without exposing access to the resolve and
+ * reject methods, you should export `getPromise` which returns a Promise with
+ * the same semantics excluding those methods.
+ */
+class Deferred<Tvalue, Treason> {
+  _settled: boolean;
+  _promise: Promise<any>;
+  _resolve: (value: Tvalue) => void;
+  _reject: (reason: Treason) => void;
+
+  constructor() {
+    this._settled = false;
+    this._promise = new Promise((resolve, reject) => {
+      this._resolve = (resolve: any);
+      this._reject = (reject: any);
+    });
+  }
+
+  getPromise(): Promise<any> {
+    return this._promise;
+  }
+
+  resolve(value: Tvalue): void {
+    this._settled = true;
+    this._resolve(value);
+  }
+
+  reject(reason: Treason): void {
+    this._settled = true;
+    this._reject(reason);
+  }
+
+  catch(): Promise<any> {
+    return Promise.prototype.catch.apply(this._promise, arguments);
+  }
+
+  then(): Promise<any> {
+    return Promise.prototype.then.apply(this._promise, arguments);
+  }
+
+  done(): void {
+    // Embed the polyfill for the non-standard Promise.prototype.done so that
+    // users of the open source fbjs don't need a custom lib for Promise
+    const promise = arguments.length ? this._promise.then.apply(this._promise, arguments) : this._promise;
+    promise.then(undefined, function (err) {
+      setTimeout(function () {
+        throw err;
+      }, 0);
+    });
+  }
+
+  isSettled(): boolean {
+    return this._settled;
+  }
+}
+
+module.exports = Deferred;
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