diff options
Diffstat (limited to 'node_modules/es6-weak-map/is-implemented.js')
-rw-r--r-- | node_modules/es6-weak-map/is-implemented.js | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/node_modules/es6-weak-map/is-implemented.js b/node_modules/es6-weak-map/is-implemented.js new file mode 100644 index 000000000..6ef5082ef --- /dev/null +++ b/node_modules/es6-weak-map/is-implemented.js @@ -0,0 +1,20 @@ +'use strict'; + +module.exports = function () { + var weakMap, x; + if (typeof WeakMap !== 'function') return false; + try { + // WebKit doesn't support arguments and crashes + weakMap = new WeakMap([[x = {}, 'one'], [{}, 'two'], [{}, 'three']]); + } catch (e) { + return false; + } + if (String(weakMap) !== '[object WeakMap]') return false; + if (typeof weakMap.set !== 'function') return false; + if (weakMap.set({}, 1) !== weakMap) return false; + if (typeof weakMap.delete !== 'function') return false; + if (typeof weakMap.has !== 'function') return false; + if (weakMap.get(x) !== 'one') return false; + + return true; +}; |