jest.config.base.js

const { basename } = require('path')
const merge = require('merge')
const tsPreset = require('ts-jest/presets/js-with-babel/jest-preset')

module.exports = ({ path }, presets = []) => {
  const name = basename(path)

  // Enables us to run tests of only a specific type (for example "integration" or "e2e").
  let type = ''
  if (process.env.TEST_TYPE) {
    type = `.${process.env.TEST_TYPE}`
  }

  return merge.recursive({}, tsPreset, ...presets, {
    name: name,
    displayName: name,
    modulePaths: [`${path}/src`],
    testMatch: [`${path}/**/__tests__/**/*${type}.test.[jt]s?(x)`],
    transform: {
      '^.+\\.(ts|tsx)$': 'ts-jest'
    },
    moduleNameMapper: {
      '~/(.*)': `${path}/src/$1`
    },
    moduleDirectories: ['node_modules'],
    moduleFileExtensions: ['ts', 'js', 'tsx'],
    modulePathIgnorePatterns: [],
    globals: {
      'ts-jest': {
        babelConfig: `${path}/.babelrc.js`,
        diagnostics: false
      }
    }
  })
}