node_modules

1 files changed, 46 insertions, 0 deletions

diff --git a/node_modules/fbjs/lib/isEmpty.js.flow b/node_modules/fbjs/lib/isEmpty.js.flow
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+++ b/node_modules/fbjs/lib/isEmpty.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 isEmpty
+ * @flow
+ */
+
+'use strict';
+
+/* eslint-disable fb-www/typeof-undefined */
+/* eslint-disable no-unused-vars */
+
+const invariant = require('./invariant');
+
+/**
+ * Checks if a value is empty.
+ */
+function isEmpty(value: mixed): boolean {
+  if (Array.isArray(value)) {
+    return value.length === 0;
+  } else if (typeof value === 'object') {
+    if (value) {
+      invariant(!isIterable(value) || value.size === undefined, 'isEmpty() does not support iterable collections.');
+      for (const _ in value) {
+        return false;
+      }
+    }
+    return true;
+  } else {
+    return !value;
+  }
+}
+
+function isIterable(value: any): boolean {
+  if (typeof Symbol === 'undefined') {
+    return false;
+  }
+  return value[Symbol.iterator];
+}
+
+module.exports = isEmpty;
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