ruanyf/es-checker

A feature detection library for ECMAScript in node.js and browser.

es-checker's Issues

Optional chaining (?.)

I don't know whether this standard belongs to ES6 or not, but in some browser kernels that use this program to verify ES6 support, you can't run Optional chaining (?.)

最新版的火狐不能完成检测，一直在绕圈

在线检测页面

Says that Firefox Nightly does not support let and const.

Am I missing something ? Firefox has supported let and const since very long ago.

It seems 'getOwnSymbolNames' function isn't specific in ES6 Specification

es6 specification

网站已经无法访问

es-checker still show "× Module export command" in Node 12

> node -v
v12.9.1

> es-checker

ECMAScript 6 Feature Detection (v1.4.2)

Variables
  √ let and const
  √ TDZ error for too-early access of let or const declarations
  √ Redefinition of const declarations not allowed
  √ destructuring assignments/declarations for arrays and objects
  √ ... operator

Data Types
  √ For...of loop
  √ Map, Set, WeakMap, WeakSet
  √ Symbol
  √ Symbols cannot be implicitly coerced

Number
  √ Octal (e.g. 0o1 ) and binary (e.g. 0b10 ) literal forms
  √ Old octal literal invalid now (e.g. 01 )
  √ Static functions added to Math (e.g. Math.hypot(), Math.acosh(), Math.imul() )
  √ Static functions added to Number (Number.isNaN(), Number.isInteger() )

String
  √ Methods added to String.prototype (String.prototype.includes(), String.prototype.re
peat() )
  √ Unicode code-point escape form in string literals (e.g. \u{20BB7} )
  √ Unicode code-point escape form in identifier names (e.g. var \u{20BB7} = 42; )
  √ Unicode code-point escape form in regular expressions (e.g. var regexp = /\u{20BB7}
/u; )
  √ y flag for sticky regular expressions (e.g. /b/y )
  √ Template String Literals

Function
  √ arrow function
  √ default function parameter values
  √ destructuring for function parameters
  √ Inferences for function name property for anonymous functions
  × Tail-call optimization for function calls and recursion

Array
  √ Methods added to Array.prototype ([].fill(), [].find(), [].findIndex(), [].entries(
), [].keys(), [].values() )
  √ Static functions added to Array (Array.from(), Array.of() )
  √ TypedArrays like Uint8Array, ArrayBuffer, Int8Array(), Int32Array(), Float64Array()
  √ Some Array methods (e.g. Int8Array.prototype.slice(), Int8Array.prototype.join(), I
nt8Array.prototype.forEach() ) added to the TypedArray prototypes
  √ Some Array statics (e.g. Uint32Array.from(), Uint32Array.of() ) added to the TypedA
rray constructors

Object
  √ __proto__ in object literal definition sets [[Prototype]] link
  √ Static functions added to Object (Object.getOwnPropertySymbols(), Object.assign() )
  √ Object Literal Computed Property
  √ Object Literal Property Shorthands
  √ Proxies
  √ Reflect

Generator and Promise
  √ Generator function
  √ Promises

Class
  √ Class
  √ super allowed in object methods
  √ class ABC extends Array { .. }

Module
  × Module export command
  × Module import command

Node 12 already supports import/export，why shows “× Module export command”

Unable to check `export` and ʻimport` exactly in browser

Because export and import are only supported in <script type="module">

I think registered global functions may be possible?

是不是可以增加判断 es5、es6 等

是不是可以增加监测对象 - 浏览器的信息

运行es-checker会监测系统默认浏览器对es 6的支持程度， 为了更加友好和严谨，建议在回显信息中加入浏览器的信息

chrome96探测Module失败

打扰您了，请教一下！
发现在支持esm的浏览器上，也显示出
✖ 模块的export命令
✖ 模板的import命令

判断浏览器是否支持ESM，是否可以使用以下方式判断。
<script type="module">
window.supportESM = true;
</script>

<script nomodule>
  window.supportESM = false;
</script>

  <script>
   setTimeout(() => {
    console.log("是否支持supportESM", window.supportESM);
   }, 1000);
  </script>

我发现普通<script>标签即使放在<script type="module">下方，执行顺序也会快一点，所以增加了1个1秒延迟打印查看。

demo 页面测试不准啊

我用chrome58 跑了一下，竟然只有90%的支持率，Array 的es6方法不支持，import不支持。。明显不对