How to define global variables in webpack?

@lottie 

In webpack, global variables can be defined by using the DefinePlugin to replace occurrences of specified placeholders with their corresponding values. Here's how you can define global variables in webpack:

1. Install webpack if you haven't already:

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npm install webpack webpack-cli --save-dev

1. Create a webpack configuration file (e.g., webpack.config.js) and define your global variables:

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const webpack = require('webpack');

module.exports = {
  // Other webpack configuration options
  
  plugins: [
    new webpack.DefinePlugin({
      MY_GLOBAL_VAR: JSON.stringify('my global variable value'),
      ANOTHER_GLOBAL_VAR: JSON.stringify('another global variable value')
    })
  ]
};

In the above code snippet, we define two global variables MY_GLOBAL_VAR and ANOTHER_GLOBAL_VAR with their respective values.

1. Use the global variables in your code:

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console.log(MY_GLOBAL_VAR); // Output: 'my global variable value'
console.log(ANOTHER_GLOBAL_VAR); // Output: 'another global variable value'

When webpack bundles your code, it will replace occurrences of MY_GLOBAL_VAR and ANOTHER_GLOBAL_VAR with their corresponding values at build time.

1. Run webpack to build your project:

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npx webpack --config webpack.config.js

This will generate a bundled file with your global variables defined in it.

By using the DefinePlugin, you can easily define and use global variables in webpack configurations.