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document known issues with const (#1916)

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Alex Lam S.L
2017-05-12 03:36:54 +08:00
committed by GitHub
parent 487ae8e3be
commit 13e5e33448
1 changed files with 10 additions and 1 deletions
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README.md
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@@ -11,7 +11,9 @@ There's also an
Chrome and probably Safari). Chrome and probably Safari).
#### Note: #### Note:
- `uglify-js` only supports ECMAScript 5 (ES5). - `uglify-js` only supports ECMAScript 5 (ES5).
- Support for `const` is [present but incomplete](#support-for-const), and may not be
transformed properly.
- Those wishing to minify ES2015+ (ES6+) should use the `npm` package [**uglify-es**](https://github.com/mishoo/UglifyJS2/tree/harmony). - Those wishing to minify ES2015+ (ES6+) should use the `npm` package [**uglify-es**](https://github.com/mishoo/UglifyJS2/tree/harmony).
Install Install
@@ -975,3 +977,10 @@ The `source_map_options` (optional) can contain the following properties:
[codegen]: http://lisperator.net/uglifyjs/codegen [codegen]: http://lisperator.net/uglifyjs/codegen
[compressor]: http://lisperator.net/uglifyjs/compress [compressor]: http://lisperator.net/uglifyjs/compress
[parser]: http://lisperator.net/uglifyjs/parser [parser]: http://lisperator.net/uglifyjs/parser
#### Support for `const`
`const` in `uglify-js@2.x` has function scope and as such behaves much like
`var` - unlike `const` in ES2015 (ES6) which has block scope. It is recommended
to avoid using `const` for this reason as it will have undefined behavior when
run on an ES2015 compatible browser.