I am unable to get jest.mock to actually mock a module in my sst TypeScript app. The repo is setup as a monorepo.

// foo.test.ts
import { create } from './service';
jest.mock('./service');
console.log(create); 
// logs [AsyncFunction: create] instead of [Function: mockConstructor]

We are using ts-jest and esbuild-runner. Here is jest.config.js:

/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  testMatch: ['**/*.test.(ts|tsx|js)'],
  testPathIgnorePatterns: ['node_modules', 'build'],
  transform: {
    '\\.ts$': 'esbuild-runner/jest',
  },
}

There is a jest issue that says you can’t mock modules without using Babel, but doesn’t esbuild-runner/jest handle that? Mocking modules is so common in jest that I’m surprised this isn’t working. There must be something I’m missing in our setup??

@Robert Gardner glad u got it working. Thanks for sharing!