Support for reading mapping from tsconfig.json

[eyedean]

Greetings,

I have a setup of ESLint + Node + TS and VS Code for a server-side project. In order to get my path aliases working in ESLint plugin of VS Code, I decided to use this package. I spent 4 hours today and finally got it to work after debugging this code!

The problem was that my project was in a subfolder of the WorkingDirectory, so the process.cwd() in https://github.com/johvin/eslint-import-resolver-alias/blob/master/index.js#L70-L71 was returning / and couldn't resolve the path to the referred module. I found that I needed to use changeProcessDirectory in the ESLint settings of VS Code in settings.json for my subfolder WorkingDirectroy. (As shown in https://github.com/Microsoft/vscode-eslint/issues/196#issuecomment-279362659)

With this history, the biggest problem I have right now is every time I want to define a new module path-mapping (alias), I need to change 3 different places individually! that is:

1. tsconfig.json,
2. .eslintrc.js (for this alias resolver),
3. and finally a manual module-alias because tsc doesn't resolve the mapping when it emits the JS codes. (Filed at https://github.com/microsoft/TypeScript/issues/26722#issuecomment-501912653)

Suggestion

In order to reduce the number of places I need to change upon adding a new mapping, I was thinking that maybe this resolver can take a parameter to read the mapping from tsconfig.json.

To start, it can take a pathToTSConfig and pathPrefix (e.g. @ or ~ to make it easier to identify the custom paths) and extract the mapping from there. That way, the source of truth will live in one less place.

I don't know if you guys think it's a good addition to this NPM package. If so, I can start working on a PR. Otherwise, I think the best I should do is to fork this resolver and create a new one, simply to support reading from tsconfig.json.

Please advise.

Thanks!

[johvin]

@eyedean sorry for being so late to see your issue. your suggestion is good, but i can't make a decision in a short time. I will think about it and get back to you in the next few days（no more than a week）.

[disbelief]

If I could chime in on this, there's also jsconfig.json for non-TypeScript projects, which works similarly:

jsconfig.json

{
  "compilerOptions": {
    "baseUrl": "src"
  },
  "include": ["src"]
}

Will allow the following import statement to work from anywhere in the project directory:

import "MyComponent" from "Components/Component";

Assuming MyComponent lives in src/Components/MyComponent.js

[Yegorich555]

Hi. Do we have any movements?

[johvin]

@eyedean @disbelief @Yegorich555 Given that different configuration files have their own syntax rules, the conversion logic is not the core function of this plug-in. Would it be better to write a converter？