What benefits could be gained from enabling the compiler option "declaration" in a TypeScript project?

I am currently working on a TypeScript project and contemplating the possibility of publishing it as an NPM package in the future.

Currently, I have the "declaration": true setting in my tsconfig.json, which is causing some issues that are irrelevant to this discussion. When I change it to false, everything works as desired.

The declaration flag generates d.ts files when set to true. However, based on insights from a post titled About "*.d.ts" in TypeScript, it seems that this feature is more useful for projects transitioning from JavaScript to TypeScript. So, why would one set this setting to true in a project that is purely TypeScript? Is it safe to keep it as false?

Answer №1

What are the benefits of enabling the compiler option “declaration” in a TypeScript project?

There are several advantages to setting this option to true.

One major benefit is for when you plan to publish your code as an NPM package!

Reasoning

By including the .js and .d.ts files instead of the .ts files when creating your NPM package, you make it easier for users to use your package across different TypeScript and JavaScript projects.

This packaging approach is highly recommended for TypeScript projects on NPM, and you can find more details on publishing in the TypeScript handbook.

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