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Three lines of Typescript with Jest to Get Typesafe Mocks

A quick TypeScript snippet for getting typesafe Jest mocks so TypeScript won't complain when you access mock-specific methods on mocked imports.

Jan 14, 2020

By
Austin Vance
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Two dark code editor windows showing a JavaScript prime number checking function on a gradient background

First the three important lines for anyone who needs to copypaste. I'll explain later!

Now a bit of explanation. When you use jest to mock an import (which I am still not convinced is a good pattern) the mock is still typed as the original import. This means that Typescript will complain if you do something like MockedImport.mocks.

Below is an example setup where this would be useful

If you need to mock implementation

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