Type resolution error in vitest

[wojtekmaj]

When evaluating tsgo (7.0.0-dev.20250528.1), I've noticed an error not visible in TypeScript (5.8.3):

vitest.config.ts:9:18 - error TS7006: Parameter 'id' implicitly has an 'any' type.

9       async load(id) {

I dug deeper and found that the defineConfig function from vitest/config has any instead of the expected types.

In vitest/dist/config.d.ts, we find:

import { UserConfig as UserConfig$1, ConfigEnv } from 'vite';
export { ConfigEnv, Plugin, UserConfig as ViteUserConfig, mergeConfig } from 'vite';

The first line returns errors for both imports:

Module '"node_modules/vite/index"' has no exported member '<IMPORT NAME HERE>'.

ctrl-clicking vite import path, I ended up in node_modules/vite/index.d.cts - something that I didn't expect, and what seems to be the clue of the original error.

https://github.com/vitejs/vite/blob/7052c8f6fc253f0a88ff04a4c18c108f3bfdaa78/packages/vite/index.d.cts#L1-L6

ctrl-clicking vite import path in TypeScript 5.8.3, I end up with a different resolved path: node_modules/vite/dist/node/index, while the types appear to be resolved to node_modules/vitest/dist/chunks/vite.Cu7NWuBa.d.ts (which includes declare module 'vite' { … bit).

Vite's imports are configured like so:

https://github.com/vitejs/vite/blob/7b588563636a6f735a6e25832f33fc08572b25d9/packages/vite/package.json#L19-L33

[jakebailey]

This is probably a dupe of #904

[wojtekmaj]

Indeed extremely likely! Sorry for bothering.