This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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39 lines
1.3 KiB
39 lines
1.3 KiB
'use strict'; |
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/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @preventMunge |
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* |
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*/ |
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/** |
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* Checks whether a collection name (e.g. "Map" or "Set") has a native polyfill |
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* that is safe to be used. |
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*/ |
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function shouldPolyfillES6Collection(collectionName) { |
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var Collection = global[collectionName]; |
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if (Collection == null) { |
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return true; |
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} |
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// The iterator protocol depends on `Symbol.iterator`. If a collection is |
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// implemented, but `Symbol` is not, it's going to break iteration because |
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// we'll be using custom "@@iterator" instead, which is not implemented on |
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// native collections. |
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if (typeof global.Symbol !== 'function') { |
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return true; |
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} |
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var proto = Collection.prototype; |
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// These checks are adapted from es6-shim: https://fburl.com/34437854 |
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// NOTE: `isCallableWithoutNew` and `!supportsSubclassing` are not checked |
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// because they make debugging with "break on exceptions" difficult. |
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return Collection == null || typeof Collection !== 'function' || typeof proto.clear !== 'function' || new Collection().size !== 0 || typeof proto.keys !== 'function' || typeof proto.forEach !== 'function'; |
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} |
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module.exports = shouldPolyfillES6Collection; |