babel/packages/babel-plugin-transform-strict-mode/README.md

@babel/plugin-transform-strict-mode

This plugin places a "use strict"; directive at the top of all files to enable 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

foo();

Out

"use strict";

foo();

Installation

npm install --save-dev @babel/plugin-transform-strict-mode

Usage

Via .babelrc (Recommended)

.babelrc

{
  "plugins": ["@babel/transform-strict-mode"]
}

Via CLI

babel --plugins @babel/transform-strict-mode script.js

Via Node API

require("@babel/core").transform("code", {
  plugins: ["@babel/transform-strict-mode"]
});