I'm trying to use the same import aliases in my test files as in my source files in a Nuxt project.

Nuxt generates a tsconfig.json like so:

{
  "files": [],
  "references": [
    {
      "path": "./.nuxt/tsconfig.app.json"
    },
    // ...

And one of those configs might define an alias like so:

{
  "compilerOptions": {
    "paths": {
      "@": [
        "../app"
      ],
      // ...

When the plugin tries to import something, it looks at the importer path, e.g. /my-project/tests/mytest.ts, and tries to look for an ancestors directory in the resolversByDir variable. The problem is is that resolversByDir does not contains a key /my-project/tests or /my-project, but only /my-project/.nuxt and thus failing to resolve the import.