vi.mock does not work if I try to mock a module of another third-party module.

[JieamI]

suspect I have a test file index.test.ts, which imports a third-party module named 'A' from node_modules, and the module 'A' also imports a third-party module named 'B'.
when I try to mock module B, it does not take effect in module A.

// index.test.ts
vi.mock('B', () => ({}))

I'm not sure if this behavior is expected, or maybe there is something wrong with my configuration.

[sheremet-va]

Vitest doesn't process imports inside node_modules. If you want mocks to take effect, use deps.inline on the module that imports the one you want to mock (in your case it is the module A).