goatslacker / es-symbol

A spec-compliant as much as it could be, small, and tested ES6 Symbol implementation.

es-symbol

A spec-compliant as much as it could be, small, and tested ES6 Symbol implementation.

• No unnecessary dependencies
• Works in node + browser (IE8--Modern browsers)
• Uses native Symbol if possible otherwise exports a polyfill

Usage

npm install es-symbol

var Symbol = require('es-symbol')

var sym = Symbol('foo')

var obj = {}
obj[sym] = 'hello'

// The following are true
obj.foo === undefined
obj[sym] === 'hello'

Disclaimer: This depends on ES5. If you need to support legacy browsers consider using an ES5 shim.

More information

Symbol Spec

Symbols in ECMAScript 6

License

es-symbol's Issues

Does this polyfill cause a stack overflow in IE11?

I have an issue (webcomponents/webcomponentsjs#972) filed with the Web Components polyfills that appear to use this module to polyfill Symbol.

The issue is that using the Web Components polyfills to get Web Components working in IE 11 causes a stack overflow error.

I found that loading the Symbol polyfill from core-js before the Web Component polyfills got things working as expected.

What appears to be fixing the problem is that a different Symbol polyfill gets loaded first. It creates window.Symbol. Then the feature is detected in @webcomponents/webcomponentsjs/src/symbol.js, so this Symbol polyfill (es-symbol/dist/symbol.js) doesn't get used.