babel/packages/babel-plugin-check-es2015-constants
Henry Zhu 7a1ccf076c Misc (#5545)
* normalize npmignores

* fixup eslint ignore, etc

* lint

* remove unused

* rm from gitignore

* use strict
2017-03-25 21:46:16 -04:00
..
2017-03-04 10:46:01 -05:00
2017-03-25 21:46:16 -04:00
2017-03-23 15:49:01 -04:00
2017-01-26 14:50:23 -06:00

babel-plugin-check-es2015-constants

Validate ES2015 constants (prevents reassignment of const variables).

Example

In

const a = 1;
a = 2;

Out

repl: "a" is read-only
  1 | const a = 1;
> 2 | a = 2;
    | ^

Installation

npm install --save-dev babel-plugin-check-es2015-constants

Usage

.babelrc

{
  "plugins": ["check-es2015-constants"]
}

Via CLI

babel --plugins check-es2015-constants script.js

Via Node API

require("babel-core").transform("code", {
  plugins: ["check-es2015-constants"]
});

Note

This check will only validate consts. If you need it to compile down to var then you must also install and enable transform-es2015-block-scoping.