babel/packages/babel-plugin-check-es2015-constants
Moti Zilberman 1ef5871300 Add tests for #5491 and related cases
The two function expression tests would fail before 6705de7. The
function declaration test was not a failing case but is added here for
completeness.
2017-08-25 19:21:38 -04:00
..
2017-08-24 21:19:02 -04:00
2017-03-25 21:46:16 -04:00
2017-08-07 18:21:08 -04:00

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.