jest: configuring for typescript and esm

2021-12-06

~1 min read

90 words

A natural follow up to Configuring Jest for Typescript with ts-jest, this Jest configuration write up is about configuring Jest to use native EcmaScript modules (ESM):

There are three steps:

tsconfig.json

{
  "target": "esnext",
  "module": "esnext"
}

jest.config.js

export default {
  globals: {
    "ts-jest": {
      useESM: true,
    },
  },
}

package.json

{
  "scripts": {
    "tdd": "node --no-warnings --experimental-vm-modules node_modules/jest/bin/jest.js --watch"
  }
}

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