What is the purpose of including .d.ts definitions in Typescript projects? Does it not seem counterintuitive?
If a library is already written in TypeScript (such as Angular2), and the TS transpiler can utilize the source .ts files for intellisense, why do we still come across .d.ts files in TS projects?
Although it's possible to easily generate .d.ts definitions using the tsd executable, I fail to see the rationale behind it.
Sincerely,
Sean
When it comes to distribution, the key factor is how a project is referenced via npm/bower. Typically, a project will provide a "main" file that is written in javascript, not typescript. Therefore, it is most practical for the output of a Typescript project to consist of:
a) The transpiled javascript file, possibly minified
b) A .d.ts file that outlines type annotations (similar to a header file in C)
Distributing in typescript format wouldn't be logical because it could hinder javascript projects from utilizing it, or would require a separate typescript version of the npm package.
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