TypeScript throws a `mockRestore` error

🐛 Bug Report

When using TypeScript, spyOn and mockImplementation, there is an error of mockRestore.

To Reproduce

I have a test case like this:

const spiedGetDuration = jest.spyOn(Player, 'getDuration').mockImplementation(() => 3600);

// test logics

spiedGetDuration.mockRestore();

but tsc throws an error:

error TS2551: Property 'mockRestore' does not exist on type 'Mock<() => any[]>'. Did you mean 'mockReset'?

I checked the @types/jest file, mockRestore is only available for SpyInstance, and jest.spyOn returns a SpyInstance, when there is no following calls like mockImplementation, there is no issue: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/jest/index.d.ts#L728

After mockImplementation, since it returns a MockInstance, mockRestore is unavailable. https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/jest/index.d.ts#L778

Expected behavior

There should be no error.

Run npx envinfo --preset jest

Paste the results here:

npx: installed 1 in 4.137s

  System:
    OS: macOS 10.14
    CPU: x64 Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
  Binaries:
    Node: 8.9.1 - ~/.nvm/versions/node/v8.9.1/bin/node
    Yarn: 1.3.2 - /usr/local/bin/yarn
    npm: 5.5.1 - ~/.nvm/versions/node/v8.9.1/bin/npm
  npmPackages:
    @types/jest: ^22.1.3 => 22.1.3
    jest: ^22.4.2 => 22.4.2

[milesj]

This needs to be reported on DefinitelyTyped, not here. That being said, just change your code to this:

const spiedGetDuration = jest.spyOn(Player, 'getDuration');
spiedGetDuration.mockImplementation(() => 3600);

// test logics

spiedGetDuration.mockRestore();

[alexandermckay]

I am still getting the issue