Cant find type .mts file

[bartlomieju]

Discussed in #28163

^{Originally posted by emilbillberg February 18, 2025}
Hi,

I am trying to run deno test with a file that imports minio-js package 8.0.4 but I get following error indicating it cannot find a type file:

error: Uncaught Error: Unable to load /Users/<username>/Library/Caches/deno/npm/registry.npmjs.org/minio/8.0.4/types/esm/minio.d.ts: No such file or directory (os error 2)
    at Object.getSourceFile (ext:deno_tsc/99_main_compiler.js:621:28)
    at findSourceFileWorker (ext:deno_tsc/00_typescript.js:126789:23)
    at findSourceFile (ext:deno_tsc/00_typescript.js:126705:20)
    at processImportedModules (ext:deno_tsc/00_typescript.js:127105:11)
    at findSourceFileWorker (ext:deno_tsc/00_typescript.js:126854:7)
    at findSourceFile (ext:deno_tsc/00_typescript.js:126705:20)
    at processImportedModules (ext:deno_tsc/00_typescript.js:127105:11)
    at findSourceFileWorker (ext:deno_tsc/00_typescript.js:126854:7)
    at findSourceFile (ext:deno_tsc/00_typescript.js:126705:20)
    at processImportedModules (ext:deno_tsc/00_typescript.js:127105:11)

How do I fix this? I can see there are some type files in another directory:

ls /Users/<username>/Library/Caches/deno/npm/registry.npmjs.org/minio/8.0.4/dist/esm/   
AssumeRoleProvider.d.mts	IamAwsProvider.d.mts		internal			signing.d.mts
AssumeRoleProvider.mjs		IamAwsProvider.mjs		minio.d.mts			signing.mjs
CredentialProvider.d.mts	errors.d.mts			minio.mjs			transformers.mjs
CredentialProvider.mjs		errors.mjs			notification.d.mts		xml-parsers.mjs
Credentials.d.mts		helpers.d.mts			notification.mjs
Credentials.mjs			helpers.mjs			promisify.mjs
```</div>

[dsherret]

It looks like a bug in the package. They don't ship types in the types folder: https://www.npmjs.com/package/minio?activeTab=code

But the export condition has types like so:

 "exports": {
    ".": {
      "require": "./dist/main/minio.js",
      "types": "./types/esm/minio.d.ts",
      "default": "./dist/esm/minio.mjs"
    },
    "./dist/main/internal/*": null,
    "./dist/main/*": {
      "require": "./dist/main/*",
      "default": null
    },
    "./dist/esm/internal/*": null,
    "./dist/esm/*": {
      "import": "./dist/esm/*",
      "default": null
    },
    "./package.json": "./package.json"
  }

#27188 would change this to be a diagnostic, but maybe typescript resolution falls back to the non-types export condition if it fails and we should investigate if this works with plain tsc.