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Please visit [demo](http://ruanyf.github.io/es-checker/).\n\n## How to use\n\n### Command line\n\n```bash\n$ npm install -g es-checker\n$ es-checker\n```\n\n![](./screenshot.png)\n\n### Node.js\n\nFirst install es-checker locally.\n\n```bash\n$ npm install --save es-checker\n```\n\nThen require it in your script.\n\n```javascript\nvar Supports = require(\"es-checker\");\n\nif (Supports.letConst) {\n  let x = 5;\n} else {\n  var x = 5;\n}\n```\n\nThe whole Api List please [see below](#api).\n\n### Browser\n\nFirst insert es-checker.js into your page.\n\n```html\n<script src=\"http://ruanyf.github.io/es-checker/es-checker.js\"></script>\n```\n\nThen use `Supports` to decide which feature to use. Visit [demo](http://ruanyf.github.io/es-checker/).\n\n```html\n<script>\nif (Supports.letConst) {\n  let x = 5;\n} else {\n  var x = 5;\n}\n</script>\n```\n\nThe whole API List please [see below](#api).\n\n## API\n\nThis library is derived from [es-feature-tests](https://github.com/getify/es-feature-tests). The following API is copied from it. Visit [FeatureTests.io](https://featuretests.io/details) for more information, including how to test a feature by yourself.\n\n- **letConst**: let and const\n- **defaultParameter**: default function parameter values\n- **spreadRest**: ... operator\n- **destructuring**: destructuring assignments/declarations for arrays and objects\n- **parameterDestructuring**: destructuring for function parameters\n- **templateString**: `..` Template String Literals\n- **forOf**: for (var v of something) { .. }\n- **arrow**: x => x * x\n- **generator**: function *foo() { .. }\n- **conciseMethodProperty**: o = { b() { .. }, a }\n- **computedProperty**: o = { [\"a\" + \"b\"]: 42 }\n- **moduleExport**: In modules, export default foo = 42\n- **moduleImport**: In modules, import bar from \"foo\"\n- **class**: class A extends B { .. }\n- **numericLiteral**: Octal and binary literal forms (0o1, 0b10)\n- **oldOctalLiteral**: Old octal literal invalid now (01)\n- **symbol**: Symbol primitive\n- **unicodeEscape**: Unicode code-point escape form in string literals ('\\u{20BB7}')\n- **unicodeIdentifier**: Unicode code-point escape form in identifier names (\\u{20BB7} = 42)\n- **unicodeRegExp**: Unicode code-point escape form in regular expressions (/\\u{20BB7}/u)\n- **stickyRegExp**: y flag for sticky regular expressions\n- **letTDZ**: TDZ error for too-early access of let or const declarations\n- **constRedef**: Redefinition of const declarations not allowed\n- **objectProto**: __proto__ in object literal definition sets [[Prototype]] link\n- **objectSuper**: super allowed in object methods\n- **extendNatives**: class ABC extends Array { .. }\n- **tco**: Tail-call optimization for function calls and recursion\n- **symbolImplicitCoercion**: Symbols can't be implicitly coerced (Symbol(\"a\") + \"\")\n- **functionNameInfernece**: Inferences for function name property for anonymous functions\n- **objectStatics**: Static functions added to Object\n- **arrayStatics**: Static functions added to Array\n- **arrayMethods**: Methods added to Array.prototype\n- **typedArrays**: TypedArrays like Uint8Array (technically a web platform feature long before ES6)\n- **typedArrayStatics**: Some Array statics (like from(..)) added to the TypedArray constructors\n- **typedArrayMethods**: Some Array methods (like map(..)) added to the TypedArray prototypes\n- **stringMethods**: Methods added to String.prototype\n- **numberStatics**: Static functions added to Number\n- **mathStatics**: Static functions added to Math\n- **collections**: Collections added (Map, Set, WeakMap, WeakSet)\n- **proxy**: Proxies\n- **promise**: Promises\n- **reflect**: Reflect\n\n## Licensed\n\nMIT\n","maintainers":[{"name":"ruanyf","email":"yifeng.ruan@gmail.com"}],"time":{"modified":"2022-06-17T08:35:40.030Z","created":"2015-06-29T11:10:12.634Z","1.0.0":"2015-06-29T11:10:12.634Z","1.0.1":"2015-06-29T11:13:52.596Z","1.0.2":"2015-06-29T21:53:12.739Z","1.1.1":"2015-06-30T02:45:33.290Z","1.2.0":"2015-07-03T15:36:29.687Z","1.3.0":"2015-07-04T02:34:57.502Z","1.4.0":"2016-06-08T03:51:20.427Z","1.4.1":"2017-03-10T02:45:13.849Z","1.4.2":"2019-07-16T13:38:41.844Z"},"homepage":"https://github.com/ruanyf/es-checker","keywords":["ecmascript","ecmascript 6","ecmascript 2015","feature","tests"],"repository":{"type":"git","url":"git+https://github.com/ruanyf/es-checker.git"},"author":{"name":"Ruan Yifeng"},"bugs":{"url":"https://github.com/ruanyf/es-checker/issues"},"license":"MIT","readmeFilename":"README.md","users":{"cqkd88":true,"sammy_winchester":true}}