What are the benefits of sharing source files for TypeScript node modules?

Why do some TypeScript node modules, like those in the loopback-next/packages repository, include their source files along with the module? Is there a specific purpose for this practice or is it simply adding unnecessary bulk to the module's size?

Answer №1

Beginning with a reliable source: the TypeScript Publishing guide emphasizes bundling declaration files only with compiled .js files, excluding .ts files.

Considering package @loopback/authentication, there could be two possible reasons:

  1. Source Maps and debugging support (highly probable)
  2. Potential usage as a source package 1

1. Source Maps and debugging support

The creators of the package may incorporate source maps for debugging purposes, connecting back to original .ts files in src. This would necessitate distributing these original sources as well. For instance, authentication.component.js.map:

"sources": ["../src/authentication.component.ts"],

Additional note: The sourcemap "spec" typically includes a sourcesContent field to facilitate self-contained source maps.

2. Source package

Instead of precompiled files, the package provides flexibility by not enforcing a specific build target. This allows client app projects to utilize their bundler and transpile the library into a targeted format independently. For example, supporting both a) Electron and b) various browsers without requiring extra polyfills or transformations for the Electron renderer build.


1 RFC: Source Packages #4092 ; also refer to 2, 3 (Mainly focused on React)

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