.npmignore000064400000001102152045562560006547 0ustar00# Logs
logs
*.log
npm-debug.log*

# Runtime data
pids
*.pid
*.seed

# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov

# Coverage directory used by tools like istanbul
coverage

# nyc test coverage
.nyc_output

# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt

# node-waf configuration
.lock-wscript

# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release

# Dependency directories
node_modules
jspm_packages

# Optional npm cache directory
.npm

# Optional REPL history
.node_repl_history
LICENSE000064400000002057152045562560005567 0ustar00MIT License

Copyright (c) 2016 Jordan Harband

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
.travis.yml000064400000004325152045562560006673 0ustar00language: node_js
node_js:
  - "6.6"
  - "6.5"
  - "6.4"
  - "6.3"
  - "6.2"
  - "6.1"
  - "6.0"
  - "5.12"
  - "5.11"
  - "5.10"
  - "5.9"
  - "5.8"
  - "5.7"
  - "5.6"
  - "5.5"
  - "5.4"
  - "5.3"
  - "5.2"
  - "5.1"
  - "5.0"
  - "4.5"
  - "4.4"
  - "4.3"
  - "4.2"
  - "4.1"
  - "4.0"
  - "iojs-v3.3"
  - "iojs-v3.2"
  - "iojs-v3.1"
  - "iojs-v3.0"
  - "iojs-v2.5"
  - "iojs-v2.4"
  - "iojs-v2.3"
  - "iojs-v2.2"
  - "iojs-v2.1"
  - "iojs-v2.0"
  - "iojs-v1.8"
  - "iojs-v1.7"
  - "iojs-v1.6"
  - "iojs-v1.5"
  - "iojs-v1.4"
  - "iojs-v1.3"
  - "iojs-v1.2"
  - "iojs-v1.1"
  - "iojs-v1.0"
  - "0.12"
  - "0.11"
  - "0.10"
  - "0.9"
  - "0.8"
  - "0.6"
  - "0.4"
before_install:
  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g npm@1.4.28 ;; 2.*) npm install -g npm@2 ;; esac ; fi'
  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
script:
  - 'if [ -n "${LINT-}" ]; then npm run lint ; fi'
  - 'if [ -n "${COVERAGE-}" ]; then npm run coverage ; fi'
  - 'if [ -n "${TEST-}" ]; then npm run tests-only ; fi'
sudo: false
env:
  - TEST=true
matrix:
  fast_finish: true
  include:
    - node_js: "node"
      env: LINT=true
  allow_failures:
    - node_js: "6.5"
    - node_js: "6.4"
    - node_js: "6.3"
    - node_js: "6.2"
    - node_js: "6.1"
    - node_js: "6.0"
    - node_js: "5.11"
    - node_js: "5.10"
    - node_js: "5.9"
    - node_js: "5.8"
    - node_js: "5.7"
    - node_js: "5.6"
    - node_js: "5.5"
    - node_js: "5.4"
    - node_js: "5.3"
    - node_js: "5.2"
    - node_js: "5.1"
    - node_js: "5.0"
    - node_js: "4.4"
    - node_js: "4.3"
    - node_js: "4.2"
    - node_js: "4.1"
    - node_js: "4.0"
    - node_js: "iojs-v3.2"
    - node_js: "iojs-v3.1"
    - node_js: "iojs-v3.0"
    - node_js: "iojs-v2.4"
    - node_js: "iojs-v2.3"
    - node_js: "iojs-v2.2"
    - node_js: "iojs-v2.1"
    - node_js: "iojs-v2.0"
    - node_js: "iojs-v1.7"
    - node_js: "iojs-v1.6"
    - node_js: "iojs-v1.5"
    - node_js: "iojs-v1.4"
    - node_js: "iojs-v1.3"
    - node_js: "iojs-v1.2"
    - node_js: "iojs-v1.1"
    - node_js: "iojs-v1.0"
    - node_js: "0.11"
    - node_js: "0.9"
    - node_js: "0.6"
    - node_js: "0.4"
README.md000064400000003412152045562560006035 0ustar00# has-symbols <sup>[![Version Badge][2]][1]</sup>

[![Build Status][3]][4]
[![dependency status][5]][6]
[![dev dependency status][7]][8]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]

[![npm badge][11]][1]

Determine if the JS environment has Symbol support. Supports spec, or shams.

## Example

```js
var hasSymbols = require('has-symbols');

hasSymbols() === true; // if the environment has native Symbol support. Not polyfillable, not forgeable.

var hasSymbolsKinda = require('has-symbols/shams');
hasSymbolsKinda() === true; // if the environment has a Symbol sham that mostly follows the spec.
```

## Supported Symbol shams
 - get-own-property-symbols [npm](https://www.npmjs.com/package/get-own-property-symbols) | [github](https://github.com/WebReflection/get-own-property-symbols)
 - core-js [npm](https://www.npmjs.com/package/core-js) | [github](https://github.com/zloirock/core-js)

## Tests
Simply clone the repo, `npm install`, and run `npm test`

[1]: https://npmjs.org/package/has-symbols
[2]: http://versionbadg.es/ljharb/has-symbols.svg
[3]: https://travis-ci.org/ljharb/has-symbols.svg
[4]: https://travis-ci.org/ljharb/has-symbols
[5]: https://david-dm.org/ljharb/has-symbols.svg
[6]: https://david-dm.org/ljharb/has-symbols
[7]: https://david-dm.org/ljharb/has-symbols/dev-status.svg
[8]: https://david-dm.org/ljharb/has-symbols#info=devDependencies
[9]: https://ci.testling.com/ljharb/has-symbols.png
[10]: https://ci.testling.com/ljharb/has-symbols
[11]: https://nodei.co/npm/has-symbols.png?downloads=true&stars=true
[license-image]: http://img.shields.io/npm/l/has-symbols.svg
[license-url]: LICENSE
[downloads-image]: http://img.shields.io/npm/dm/has-symbols.svg
[downloads-url]: http://npm-stat.com/charts.html?package=has-symbols
CHANGELOG.md000064400000000072152045562560006366 0ustar001.0.0 / 2016-09-19
=================
  * Initial release.
package.json000064400000004064152045562560007050 0ustar00{
	"name": "has-symbols",
	"version": "1.0.0",
	"author": {
		"name": "Jordan Harband",
		"email": "ljharb@gmail.com",
		"url": "http://ljharb.codes"
	},
	"contributors": [
		{
			"name": "Jordan Harband",
			"email": "ljharb@gmail.com",
			"url": "http://ljharb.codes"
		}
	],
	"description": "Determine if the JS environment has Symbol support. Supports spec, or shams.",
	"license": "MIT",
	"main": "index.js",
	"scripts": {
		"prepublish": "safe-publish-latest",
		"pretest": "npm run --silent lint",
		"test": "npm run --silent tests-only",
		"posttest": "npm run --silent security",
		"tests-only": "npm run --silent test:stock && npm run --silent test:staging && npm run --silent test:shams",
		"test:stock": "node test",
		"test:staging": "node --harmony --es-staging test",
		"test:shams": "npm run --silent test:shams:getownpropertysymbols && npm run --silent test:shams:corejs",
		"test:shams:corejs": "node test/shams/core-js.js",
		"test:shams:getownpropertysymbols": "node test/shams/get-own-property-symbols.js",
		"lint": "eslint *.js",
		"security": "nsp check"
	},
	"repository": {
		"type": "git",
		"url": "git://github.com/ljharb/has-symbols.git"
	},
	"keywords": [
		"Symbol",
		"symbols",
		"typeof",
		"sham",
		"polyfill",
		"native",
		"core-js",
		"ES6"
	],
	"dependencies": {},
	"devDependencies": {
		"tape": "^4.6.0",
		"nsp": "^2.6.1",
		"safe-publish-latest": "^1.0.1",
		"eslint": "^3.5.0",
		"@ljharb/eslint-config": "^8.0.0",
		"get-own-property-symbols": "^0.9.2",
		"core-js": "^2.4.1"
	},
	"testling": {
		"files": "test/index.js",
		"browsers": [
			"iexplore/6.0..latest",
			"firefox/3.0..6.0",
			"firefox/15.0..latest",
			"firefox/nightly",
			"chrome/4.0..10.0",
			"chrome/20.0..latest",
			"chrome/canary",
			"opera/10.0..latest",
			"opera/next",
			"safari/4.0..latest",
			"ipad/6.0..latest",
			"iphone/6.0..latest",
			"android-browser/4.2"
		]
	},
	"engines": {
		"node": ">= 0.4"
	}

,"_resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.0.tgz"
,"_integrity": "sha1-uhqPGvKg/DllD1yFA2dwQSIGO0Q="
,"_from": "has-symbols@1.0.0"
}shams.js000064400000003314152045562560006230 0ustar00'use strict';

/* eslint complexity: [2, 17], max-statements: [2, 33] */
module.exports = function hasSymbols() {
	if (typeof Symbol !== 'function' || typeof Object.getOwnPropertySymbols !== 'function') { return false; }
	if (typeof Symbol.iterator === 'symbol') { return true; }

	var obj = {};
	var sym = Symbol('test');
	var symObj = Object(sym);
	if (typeof sym === 'string') { return false; }

	if (Object.prototype.toString.call(sym) !== '[object Symbol]') { return false; }
	if (Object.prototype.toString.call(symObj) !== '[object Symbol]') { return false; }

	// temp disabled per https://github.com/ljharb/object.assign/issues/17
	// if (sym instanceof Symbol) { return false; }
	// temp disabled per https://github.com/WebReflection/get-own-property-symbols/issues/4
	// if (!(symObj instanceof Symbol)) { return false; }

	// if (typeof Symbol.prototype.toString !== 'function') { return false; }
	// if (String(sym) !== Symbol.prototype.toString.call(sym)) { return false; }

	var symVal = 42;
	obj[sym] = symVal;
	for (sym in obj) { return false; } // eslint-disable-line no-restricted-syntax
	if (typeof Object.keys === 'function' && Object.keys(obj).length !== 0) { return false; }

	if (typeof Object.getOwnPropertyNames === 'function' && Object.getOwnPropertyNames(obj).length !== 0) { return false; }

	var syms = Object.getOwnPropertySymbols(obj);
	if (syms.length !== 1 || syms[0] !== sym) { return false; }

	if (!Object.prototype.propertyIsEnumerable.call(obj, sym)) { return false; }

	if (typeof Object.getOwnPropertyDescriptor === 'function') {
		var descriptor = Object.getOwnPropertyDescriptor(obj, sym);
		if (descriptor.value !== symVal || descriptor.enumerable !== true) { return false; }
	}

	return true;
};
index.js000064400000000612152045562560006222 0ustar00'use strict';

var origSymbol = global.Symbol;
var hasSymbolSham = require('./shams');

module.exports = function hasNativeSymbols() {
	if (typeof origSymbol !== 'function') { return false; }
	if (typeof Symbol !== 'function') { return false; }
	if (typeof origSymbol('foo') !== 'symbol') { return false; }
	if (typeof Symbol('bar') !== 'symbol') { return false; }

	return hasSymbolSham();
};