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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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