Comparing tsconfig.json and tsconfig.build.json: what sets them apart?

Guides like those found at 1 and 2 often recommend having two separate files - tsconfig.json and tsconfig.build.json - at the root level of an NPM monorepo for TypeScript projects.

What are the distinctions between these files? Is it possible to consolidate them into a single file, say tsconfig.json? Additionally, other resources mention files like tsconfig.app.json and tsconfig.base.json. Are the extensions ".app", ".build", and ".base" standard conventions, or can any arbitrary words be used, such as tsconfig.foo.json?

Answer №1

By default, the tsc command will search for the tsconfig.json file in the current directory. If it is not found, it will continue to look in the parent directory, and so on. This process is similar to how Node.js resolves paths using the package.json.

If you require different configurations, you can create multiple configuration files. For example, your project may have both a tsconfig.json and a tsconfig.build.json. Typically, the tsconfig.json is used by default, while the tsconfig.build.json is used with the tsc -b command, which only compiles files that are out-of-date to save time. To keep these files organized and easy to maintain, you can use the extends keyword in them. More information can be found on the official TypeScript website.

You can also use any file name such as my-best-config.json, as long as you explicitly specify it when running tsc. Another example of this flexible configuration approach is seen in tools like webpack.

Answer №2

The official TypeScript documentation provides guidance on utilizing the configuration file efficiently.

Typically, when TypeScript is transpiled to JavaScript, a configuration file is used to specify which parts of your project should be transpiled individually rather than all at once.

For instance, in a production environment, you may want to transpile the entire src folder without including the test folder. However, in a development setting, both the src and test folders should be transpiled.

To learn more about this concept, refer to the official documentation through the following link:

Official TypeScript Documentation

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