How to Define Global Variables in Your Webpack Application?

Define Global Variables with Webpack

Webpack enables defining global variables that can be accessed from any module in your application. Here are several approaches to consider:

1. Module System

Place variables in a module. Webpack evaluates modules only once, ensuring that the variable remains global, carrying changes across modules. Export an object of globals from a module, import it into other modules, and access or modify the shared variable.

2. ProvidePlugin

Use Webpack's ProvidePlugin to make a module available as a global variable in all importing modules. This is useful for modules that are commonly used across your application, eliminating the need for repeated imports.

3. DefinePlugin

Webpack's DefinePlugin allows defining global variables using const and string values. Add this plugin to your Webpack configuration and access the variables within your code. Use this approach when you need string-based constants as globals.

4. Global Objects

Use the global window object (for browsers) or Node's global object. Accessing globals through window or global provides a simple and widely used method for defining global variables.

5. dotenv

(Server-side) Use the dotenv package to read configuration variables from a local .env file and add them to Node's process.env object. This approach enables storing sensitive information or environment-specific variables outside of your codebase.

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