Setting up Webpack to compile without reliance on external modules: A step-by-step guide

I am facing an issue with a third-party library that needs to be included in my TypeScript project. The library is added to the application through a CDN path in the HTML file, and it exports a window variable that is used in the code.

Unfortunately, this package is not available as an npm module. When I try to run the webpack build, I encounter the following error message: 

error TS2304: Cannot find name 'CUSTOM_WINDOW_VARIABLE'.

In an attempt to resolve this issue, I added the following code snippet in the webpackconfig.js file:

    externals: {
      CUSTOM_WINDOW_VARIABLE: "CUSTOM_WINDOW_VARIABLE",
    },

Despite adding this configuration, I continue to receive the same error. Can anyone advise on how to instruct webpack to ignore these global variables during the build process or convert them from CUSTOM_WINDOW_VARIABLE to window.CUSTOM_WINDOW_VARIABLE?

javascripttypescriptwebpack

Answer №1

It seems that the issue you are facing is not related to webpack, but rather stemming from ts-loader which utilizes the tsc compiler for your tsx? files. To resolve this, you may need to define the type for the global value available on window by following these steps:

  • Create a new typing directory and add a file named types/global.d.ts (you can choose any name you prefer, using my suggestion if you're unsure) with the following content:
// global.d.ts

// Define your custom type here
declare const CUSTOM_WINDOW_VARIABLE: any;
  • Ensure that your tsconfig.json file located at the root of your repository includes the types directory in the include configuration like so:
// tsconfig.json
{
  "include": ["types", ...]
}

This should resolve the issue you are experiencing.

NOTE: If you are not importing your library as externals, there is no need to configure the externals property in your webpack.config file

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