jest.config.js

// For a detailed explanation regarding each configuration property, visit:
// https://jestjs.io/docs/en/configuration.html

module.exports = {
  // Automatically clear mock calls and instances between every test
  clearMocks: true,

  // An array of glob patterns indicating a set of files for which coverage information should be collected
  collectCoverageFrom: ["src/**/*.{js,jsx,mjs,ts}"],

  // The directory where Jest should output its coverage files
  coverageDirectory: "coverage",

  // An array of file extensions your modules use
  moduleFileExtensions: ["js", "json", "jsx", "ts"],

  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
  testPathIgnorePatterns: ["/lib/", "/node_modules/", "/src/testUtils"],

  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
  transformIgnorePatterns: ["<rootDir>/node_modules/"],

  testMatch: ["**/__tests__/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)"],

  // Indicates whether each individual test should be reported during the run
  verbose: false,

  //ts-jest recommended settings
  preset: "ts-jest",
  testEnvironment: "node"
};