diff options
Diffstat (limited to 'node_modules/es6-weak-map/is-weak-map.js')
-rw-r--r-- | node_modules/es6-weak-map/is-weak-map.js | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/node_modules/es6-weak-map/is-weak-map.js b/node_modules/es6-weak-map/is-weak-map.js new file mode 100644 index 000000000..10bb2a156 --- /dev/null +++ b/node_modules/es6-weak-map/is-weak-map.js @@ -0,0 +1,13 @@ +'use strict'; + +var toStringTagSymbol = require('es6-symbol').toStringTag + + , toString = Object.prototype.toString + , id = '[object WeakMap]' + , Global = (typeof WeakMap === 'undefined') ? null : WeakMap; + +module.exports = function (x) { + return (x && ((Global && (x instanceof Global)) || + (toString.call(x) === id) || (x[toStringTagSymbol] === 'WeakMap'))) || + false; +}; |