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- # babel-plugin-check-es2015-constants
- Validate ES2015 constants (prevents reassignment of const variables).
- ## Example
- **In**
- ```js
- const a = 1;
- a = 2;
- ```
- **Out**
- ```bash
- repl: "a" is read-only
- 1 | const a = 1;
- > 2 | a = 2;
- | ^
- ```
- [Try in REPL](http://babeljs.io/repl/#?babili=false&evaluate=true&lineWrap=false&presets=es2015&experimental=false&loose=false&spec=false&code=const%20a%20%3D%201%3B%0Aa%20%3D%202%3B&playground=true)
- ## Installation
- ```sh
- npm install --save-dev babel-plugin-check-es2015-constants
- ```
- ## Usage
- ### Via `.babelrc` (Recommended)
- **.babelrc**
- ```json
- {
- "plugins": ["check-es2015-constants"]
- }
- ```
- ### Via CLI
- ```sh
- babel --plugins check-es2015-constants script.js
- ```
- ### Via Node API
- ```javascript
- 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`](http://babeljs.io/docs/plugins/transform-es2015-block-scoping/).
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