https://github.com/jokeyrhyme/is-es5-supported
does this JavaScript environment conform to ECMAScript 5?
https://github.com/jokeyrhyme/is-es5-supported
ecmascript ecmascript5 feature-detection javascript
Last synced: 3 months ago
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does this JavaScript environment conform to ECMAScript 5?
- Host: GitHub
- URL: https://github.com/jokeyrhyme/is-es5-supported
- Owner: jokeyrhyme
- License: bsd-2-clause
- Created: 2015-06-03T01:21:37.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2020-05-25T04:08:27.000Z (about 5 years ago)
- Last Synced: 2025-03-14T12:05:07.910Z (3 months ago)
- Topics: ecmascript, ecmascript5, feature-detection, javascript
- Language: JavaScript
- Size: 78.1 KB
- Stars: 3
- Watchers: 1
- Forks: 0
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# is-es5-supported.js [](https://www.npmjs.com/package/is-es5-supported) [](https://travis-ci.org/jokeyrhyme/is-es5-supported)
does this JavaScript environment conform to ECMAScript 5?
## What is this?
I made this after reading [Kangax](https://github.com/kangax)'s terrific
[ES5 compatibility table](http://kangax.github.io/compat-table/es5/). Rather
than feature-detect every single piece of ECMAScript 5, I've selected the
smallest number of tests to identify non-conformant JavaScript environments.
> `parseInt()` ignores leading zeros
- after this test, we get a `false` in most old browsers
> Strict Mode
- after this test, we get a `false` in Internet Explorer 9 and environments or
apps that load [ES5-shim](https://github.com/es-shims/es5-shim)
> `Date.prototype.toISOString`
- after this test, we get a `false` in EJS
Job done!
## Supported Environments
I've manually tested in a range of environments:
- `true`: Node.js (0.12), Chrome (43), Safari (8), Firefox (38), Internet
Explorer (10, 11), Edge
- `false`: Internet Explorer (6, 7, 8, 9)
## Usage
- CommonJS (e.g. Node.js, Browserify, etc) use [index.js](index.js)
```javascript
var isES5Supported = require('is-es5-supported');
console.log(isES5Supported); // `true` or `false`
```
- [dist/index.js](dist/index.js) is a UMD-wrapped version for browsers and AMD
```html
console.log(isES5Supported); // `true` or `false`
```
## Known Issues
- this approach does assume correlations between the 3 included tests and the
rest of the ECMASCript 5 implementation, which might not return correct
results in exotic environments
- Internet Explorer 10 Platform Preview 2 will get a `false` (who cares?)