Typescript-optimized Npm library utilizing the module-alias feature

As I work on creating an npm library with Typescript, I have made use of the paths setting in tsconfig.json and the module-alias tool to streamline my imports, allowing me to use syntax like import * from '@/utils'. However, I have encountered an issue where these paths remain unchanged in the transpiled js files. While this behavior is expected for module-alias to function correctly, I have noticed that it only works when I use the library locally. Once I install the library via npm and attempt to run it, the import paths no longer function as intended. How can this issue be resolved?

Upon further investigation, I discovered that adding the __moduleAliases configuration to the package.json file of the project utilizing my library and specifying the path to the library's distribution folder resolves the issue. However, I am still unsure of a definitive solution to this problem.

typescriptnpmmodule-alias

Answer №1

I believe I have stumbled upon a solution, however, it is not without its flaws.

By passing the path to the package.json file with the configuration settings to the module-alias as an argument, I can simply use 

moduleAlias(path.join(__dirname, '..', 'package.json'));
to specify the package.json of my library in an "absolute" manner. This ensures that even if another user installs my library in a different project, module alias will still use the package.json from my library.

There are still a couple of issues:

  • The first problem arises when the project importing my library also uses module alias; it will no longer function properly as it will search for aliases within my library instead of the project.
  • The second issue occurs when my project utilizes typescript, leading to errors when encountering '@' symbols. The only viable solution seems to be using a method to convert the '@' paths to their actual paths in the resulting JavaScript.

Answer №2

It ended up being quite challenging to solve. I ended up turning to webpack to convert all the @ aliased paths to regular paths, which effectively resolved the issue, leading me to remove module-alias. I made use of the webpack plugin found at https://www.npmjs.com/package/tsconfig-paths-webpack-plugin. Additionally, there is another plugin available that can be used independently of webpack at https://www.npmjs.com/package/tsconfig-paths

If you'd like to see an example of a library compiled with webpack and utilizing this plugin, you can check out https://github.com/euberdeveloper/euberlog

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