jest.config.js

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

module.exports = {
	// All imported modules in your tests should be mocked automatically
	// automock: false,

	// Stop running tests after `n` failures
	bail                       : 5,

	// Respect "browser" field in package.json when resolving modules
	// browser: false,

	// The directory where Jest should store its cached dependency information
	// cacheDirectory: "/private/var/folders/v6/vxx3hpm13v338c1_9z1_v11h0000gn/T/jest_dx",

	// Automatically clear mock calls and instances between every test
	clearMocks                 : true,

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

	// An array of glob patterns indicating a set of files for which coverage information should be collected
	// collectCoverageFrom: null,

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

	// An array of regexp pattern strings used to skip coverage collection
	coveragePathIgnorePatterns : [ '/node_modules/', '/config/' ],

	// A list of reporter names that Jest uses when writing coverage reports
	// coverageReporters: [
	//   "json",
	//   "text",
	//   "lcov",
	//   "clover"
	// ],

	// An object that configures minimum threshold enforcement for coverage results
	// coverageThreshold: null,

	// A path to a custom dependency extractor
	// dependencyExtractor: null,

	// Make calling deprecated APIs throw helpful error messages
	// errorOnDeprecated: false,

	// Force coverage collection from ignored files using an array of glob patterns
	// forceCoverageMatch: [],

	// A path to a module which exports an async function that is triggered once before all test suites
	// globalSetup: null,

	// A path to a module which exports an async function that is triggered once after all test suites
	// globalTeardown: null,

	// A set of global variables that need to be available in all test environments
	// globals: {},

	// The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
	// maxWorkers: "50%",

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

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

	// A map from regular expressions to module names that allow to stub out resources with a single module
	// moduleNameMapper: {},

	// An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
	// modulePathIgnorePatterns: [],

	// Activates notifications for test results
	// notify: false,

	// An enum that specifies notification mode. Requires { notify: true }
	// notifyMode: "failure-change",

	// A preset that is used as a base for Jest's configuration
	// preset: null,

	// Run tests from one or more projects
	// projects: null,

	// Use this configuration option to add custom reporters to Jest
	// reporters: undefined,

	// Automatically reset mock state between every test
	// resetMocks: false,

	// Reset the module registry before running each individual test
	// resetModules: false,

	// A path to a custom resolver
	// resolver: null,

	// Automatically restore mock state between every test
	// restoreMocks: false,

	// The root directory that Jest should scan for tests and modules within
	// rootDir: null,

	// A list of paths to directories that Jest should use to search for files in
	// roots                      : [],

	// Allows you to use a custom runner instead of Jest's default test runner
	// runner: "jest-runner",

	// The paths to modules that run some code to configure or set up the testing environment before each test
	// setupFiles: [],

	// A list of paths to modules that run some code to configure or set up the testing framework before each test
	// setupFilesAfterEnv: [],

	// A list of paths to snapshot serializer modules Jest should use for snapshot testing
	// snapshotSerializers: [],

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

	// Options that will be passed to the testEnvironment
	// testEnvironmentOptions: {},

	// Adds a location field to test results
	// testLocationInResults: false,

	// The glob patterns Jest uses to detect test files
	testMatch                  : [
		'**/__tests__/**/*.[jt]s?(x)',
		'**/?(*.)+(spec|test).[tj]s?(x)'
	],

	// An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
	testPathIgnorePatterns     : [ '/node_modules/', 'client' ],

	// The regexp pattern or array of patterns that Jest uses to detect test files
	// testRegex                  : [ '/test/' ]

	// This option allows the use of a custom results processor
	// testResultsProcessor: null,

	// This option allows use of a custom test runner
	// testRunner: "jasmine2",

	// This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
	// testURL: "http://localhost",

	// Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
	// timers: "real",

	// A map from regular expressions to paths to transformers
	// transform: null,

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

	// An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
	// unmockedModulePathPatterns: undefined,

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

	// An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
	// watchPathIgnorePatterns: [],

	// Whether to use watchman for file crawling
	// watchman: true,
};