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,

  // Indicates whether the coverage information should be collected while executing the test
  collectCoverage: true,

  collectCoverageFrom: ['<rootDir>/src/app/**/*.tsx', '<rootDir>/src/app/utils/utils.ts'],

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

  // An array of directory names to be searched recursively up from the requiring module's location
  moduleDirectories: ['node_modules', '<rootDir>/src'],

  // A map from regular expressions to module names that allow to stub out resources with a single module
  moduleNameMapper: {
    '\\.(css|less)$': '<rootDir>/__mocks__/styleMock.js',
    '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
      '<rootDir>/__mocks__/fileMock.js',
    '@app/(.*)': '<rootDir>/src/app/$1',
  },

  // A preset that is used as a base for Jest's configuration
  preset: 'ts-jest/presets/js-with-ts',

  // The test environment that will be used for testing.
  testEnvironment: 'jsdom',

  transformIgnorePatterns: [
    'node_modules/(?!@patternfly|react-syntax-highlighter|remark-gfm|react-markdown|remark-parse|devlop|hast-util-to-jsx-runtime|comma-separated-tokens|estree-util-is-identifier-name|hast-util-whitespace|property-information|space-separated-tokens|unist-util-position|vfile-message|unist-util-stringify-position|html-url-attributes|mdast-util-from-markdown|mdast-util-to-string|micromark|decode-named-character-reference|remark-rehype|mdast-util-to-hast|trim-lines|unist-util-visit|unist-util-is|unified|bail|is-plain-obj|trough|vfile|mdast-util-gfm|ccount|mdast-util-find-and-replace|escape-string-regexp|markdown-table|mdast-util-to-markdown|zwitch|longest-streak|mdast-util-phrasing)',
  ],

  transform: {
    '^.+\\.(js|jsx|ts|tsx)$': 'babel-jest',
  },
  setupFilesAfterEnv: ['./setupTests.ts'],
};