Description

Fixes #4002.

d.ts files are treated as an ambient module declarations only if they don't have any imports. If you provide an import line, it's now treated as a normal module file, not the global one, so augmenting modules definitions doesn't work.

• Michał Lytek from StackOverflow

Thus, the addition of imports in the client.d.ts in #3638:

import {
  ErrorPayload,
  FullReloadPayload,
  PrunePayload,
  UpdatePayload
} from 'types/hmrPayload'

Is improper and invalidates client.d.ts as an ambient declaration.

Instead, we have to import types this way:

(
  event: 'vite:beforeUpdate',
  cb: (payload: import('./types/hmrPayload').UpdatePayload) => void
): void

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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