Experimental port to Firebase hosting

public/es6-promise@4.2.5/lib/es6-promise/enumerator.js

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+import {
+  isArray,
+  isMaybeThenable
+} from './utils';
+import {
+  noop,
+  reject,
+  fulfill,
+  subscribe,
+  FULFILLED,
+  REJECTED,
+  PENDING,
+  getThen,
+  handleMaybeThenable
+} from './-internal';
+
+import then from './then';
+import Promise from './promise';
+import originalResolve from './promise/resolve';
+import originalThen from './then';
+import { makePromise, PROMISE_ID } from './-internal';
+
+function validationError() {
+  return new Error('Array Methods must be provided an Array');
+};
+
+export default class Enumerator {
+  constructor(Constructor, input) {
+    this._instanceConstructor = Constructor;
+    this.promise = new Constructor(noop);
+
+    if (!this.promise[PROMISE_ID]) {
+      makePromise(this.promise);
+    }
+
+    if (isArray(input)) {
+      this.length     = input.length;
+      this._remaining = input.length;
+
+      this._result = new Array(this.length);
+
+      if (this.length === 0) {
+        fulfill(this.promise, this._result);
+      } else {
+        this.length = this.length || 0;
+        this._enumerate(input);
+        if (this._remaining === 0) {
+          fulfill(this.promise, this._result);
+        }
+      }
+    } else {
+      reject(this.promise, validationError());
+    }
+  }
+  _enumerate(input) {
+    for (let i = 0; this._state === PENDING && i < input.length; i++) {
+      this._eachEntry(input[i], i);
+    }
+  }
+
+  _eachEntry(entry, i) {
+    let c = this._instanceConstructor;
+    let { resolve } = c;
+
+    if (resolve === originalResolve) {
+      let then = getThen(entry);
+
+      if (then === originalThen &&
+        entry._state !== PENDING) {
+        this._settledAt(entry._state, i, entry._result);
+      } else if (typeof then !== 'function') {
+        this._remaining--;
+        this._result[i] = entry;
+      } else if (c === Promise) {
+        let promise = new c(noop);
+        handleMaybeThenable(promise, entry, then);
+        this._willSettleAt(promise, i);
+      } else {
+        this._willSettleAt(new c(resolve => resolve(entry)), i);
+      }
+    } else {
+      this._willSettleAt(resolve(entry), i);
+    }
+  }
+
+  _settledAt(state, i, value) {
+    let { promise } = this;
+
+    if (promise._state === PENDING) {
+      this._remaining--;
+
+      if (state === REJECTED) {
+        reject(promise, value);
+      } else {
+        this._result[i] = value;
+      }
+    }
+
+    if (this._remaining === 0) {
+      fulfill(promise, this._result);
+    }
+  }
+
+  _willSettleAt(promise, i) {
+    let enumerator = this;
+
+    subscribe(
+      promise, undefined,
+      value => enumerator._settledAt(FULFILLED, i, value),
+      reason => enumerator._settledAt(REJECTED, i, reason)
+    );
+  }
+};