How to genereate type definitions with bun build bundle?

How to Generate Type Definitions with Bun Build Bundle?

If you are using TypeScript in your project, you may have come across the need to generate type definitions for your bundled JavaScript files. This is especially important when you are using a bundler like Bun to bundle your TypeScript code into a single file. In this blog post, we will explore different ways to generate type definitions with Bun Build Bundle.

1. Using the “dts-bundle-generator” Package

The “dts-bundle-generator” package is a popular choice for generating type definitions from bundled JavaScript files. It provides a simple and straightforward way to generate .d.ts files.

To use this package, first, install it by running the following command:

npm install dts-bundle-generator --save-dev

Next, add the following script to your package.json file:

"scripts": {
  "generate-types": "dts-bundle-generator --name yourLibraryName --main path/to/your/bundled/file.js --out path/to/output/file.d.ts"
}

Replace “yourLibraryName” with the name of your library and provide the correct paths to your bundled file and the output file.

Now, you can generate the type definitions by running the following command:

npm run generate-types

2. Using the “tsickle” Compiler

Another way to generate type definitions with Bun Build Bundle is by using the “tsickle” compiler. “tsickle” is a TypeScript-to-Closure transpiler that can also generate type declarations.

To use “tsickle”, first, install it by running the following command:

npm install tsickle --save-dev

Next, add the following script to your package.json file:

"scripts": {
  "generate-types": "bun build && npx tsickle --externs path/to/externs.js --outDir path/to/output"
}

Replace “path/to/externs.js” with the path to your externs file (if any) and provide the correct output directory.

Now, you can generate the type definitions by running the following command:

npm run generate-types

Conclusion

In this blog post, we explored two different ways to generate type definitions with Bun Build Bundle. You can choose the method that best suits your project’s requirements. The “dts-bundle-generator” package provides a simple and straightforward approach, while the “tsickle” compiler offers more flexibility and customization options.

Remember to always update your type definitions whenever you make changes to your bundled JavaScript files to ensure type safety in your TypeScript projects.

That’s it for this blog post! Happy coding!