[eslint-plugin-packlets] Linting does not mark local imports when using path aliases

[trane]

Summary

The packlets plugin checks local imports to ensure that we only import local code from other packlets — but there is a common edge case in Typescript repositories for which this fails: imports that use aliases defined in the tsconfig.json's compilerOptions.paths.

Details

Imagine this directory structure:

repo
├── app
└── src
    └── packlets
        ├── logger
        └── metrics

Now take this import statment in src/packlets/logger/log.ts:

import { Thing } from '../../app' // ERROR

However, if your tsconfig.json had the following configuration:

{
  "compilerOptions": {
    "paths": {
      "@app": ["app"],
    }
  }
}

An alias in your src/packlets/logger/log.ts would pass linting:

import { Thing } from '@app' // ALLOWED

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@rushstack/eslint-plugin-packlets version?	0.3.4
Operating system?	Mac
Would you consider contributing a PR?	Yes
TypeScript compiler version?	4.5.4
Node.js version (node -v)?	v14.17.4