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schangxiang@126.com
2025-09-19 18966e02fb573c7e2bb0c6426ed792b38b910940
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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"]
});
```