Jest Config to Resolve Typescript Paths Mapping

jest.config.js

/* eslint-disable @typescript-eslint/no-var-requires */
const { readFileSync } = require('fs');
const { resolve } = require('path');
const stripJSON = require('strip-json-comments');
const { pathsToModuleNameMapper } = require('ts-jest/utils');

function readAndStripJSON(...path) {
  const rawJSONString = readFileSync(resolve(process.cwd(), ...path), {
    encoding: 'utf8',
  });

  const strippedComments = stripJSON(rawJSONString);

  return JSON.parse(strippedComments);
}

/**
 * @type {import('./tsconfig.json')}
 */
const { compilerOptions } = readAndStripJSON('tsconfig.json');

module.exports = {
  bail: true,
  preset: 'ts-jest',
  testEnvironment: 'node',
  moduleDirectories: ['node_modules', '<rootDir>'],
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, {
    prefix: '<rootDir>/',
  }),
  testPathIgnorePatterns: [
    '<rootDir>/node_modules',
    '<rootDir>/config',
    '<rootDir>/dist',
  ],
  globals: {
    'ts-jest': {
      diagnostics: false,
    },
  },
};