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- # babel-plugin-transform-strict-mode
- > This plugin places a `"use strict";` directive at the top of all files to enable [strict mode](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode).
- This plugin may be enabled via `babel-plugin-transform-es2015-modules-commonjs`.
- If you wish to disable it you can either turn `strict` off or pass
- `strictMode: false` as an option to the commonjs transform.
- ## Example
- **In**
- ```javascript
- foo();
- ```
- **Out**
- ```javascript
- "use strict";
- foo();
- ```
- ## Installation
- ```sh
- npm install --save-dev babel-plugin-transform-strict-mode
- ```
- ## Usage
- ### Via `.babelrc` (Recommended)
- **.babelrc**
- Without options:
- ```json
- {
- "plugins": ["transform-strict-mode"]
- }
- ```
- With options:
- ```json
- {
- "plugins": [
- ["transform-strict-mode", {
- "strict": true
- }]
- ]
- }
- ```
- ### Via CLI
- ```sh
- babel --plugins transform-strict-mode script.js
- ```
- ### Via Node API
- ```javascript
- require("babel-core").transform("code", {
- plugins: ["transform-strict-mode"]
- });
- ```
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