I am encountering an issue with my Typescript project that contains two files, a.ts and b.ts. In a.ts, I have imported b.ts using the following syntax:
import * from "./b.js"
While this setup works smoothly with Typescript, Jest (using ts-jest) throws an error:
Cannot find module './b.js' from 'a.ts'
Is there a way to configure Jest to recognize the .js import as a .ts file during testing?
Just found the solution. I needed to include the following code in my jest.config.ts
moduleNameMapper: {
'^(\\.{1,2}/.*)\\.js$': '$1',
},
This code maps filenames with the extension .js to a version without an extension, allowing Jest (specifically ts-node under the hood) to locate them.
Additionally, it is essential to have preset: 'ts-jest', although I had already included that previously.
There are several potential causes for the "module not found" error in TypeScript:
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