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Oct 21, 2025
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docs: correct typos in migration guide #8750

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4 changes: 2 additions & 2 deletions docs/guide/migration.md
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Expand Up @@ -73,7 +73,7 @@ See also new guides:

### `spyOn` and `fn` Support Constructors

Previously, if you tried to spy on a constructor with `vi.spyOn`, you would get an error like `Constructor <name> requires 'new'`. Since Vitest 4, all mocks called with a `new` keyword construct the instance instead of callying `mock.apply`. This means that the mock implementation has to use either the `function` or the `class` keyword in these cases:
Previously, if you tried to spy on a constructor with `vi.spyOn`, you would get an error like `Constructor <name> requires 'new'`. Since Vitest 4, all mocks called with a `new` keyword construct the instance instead of calling `mock.apply`. This means that the mock implementation has to use either the `function` or the `class` keyword in these cases:

```ts {12-14,16-20}
const cart = {
Expand Down Expand Up @@ -104,7 +104,7 @@ Note that now if you provide an arrow function, you will get [`<anonymous> is no

### Changes to Mocking

Alongside new features like supporting constructors, Vitest 4 creates mocks differently to address several module mocking issues that we received over the years. This release attemts to make module spies less confusing, especially when working with classes.
Alongside new features like supporting constructors, Vitest 4 creates mocks differently to address several module mocking issues that we received over the years. This release attempts to make module spies less confusing, especially when working with classes.

- `vi.fn().getMockName()` now returns `vi.fn()` by default instead of `spy`. This can affect snapshots with mocks - the name will be changed from `[MockFunction spy]` to `[MockFunction]`. Spies created with `vi.spyOn` will keep using the original name by default for better debugging experience
- `vi.restoreAllMocks` no longer resets the state of spies and only restores spies created manually with `vi.spyOn`, automocks are no longer affected by this function (this also affects the config option [`restoreMocks`](/config/#restoremocks)). Note that `.mockRestore` will still reset the mock implementation and clear the state
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