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How to use statSyncCached method in Jest

Best JavaScript code snippet using jest

fileWalkers.js

Source:fileWalkers.js

...86  IPathType[(IPathType['DIRECTORY'] = 2)] = 'DIRECTORY';87  IPathType[(IPathType['OTHER'] = 3)] = 'OTHER';88})(IPathType || (IPathType = {}));89const checkedPaths = new Map();90function statSyncCached(path) {91  const result = checkedPaths.get(path);92  if (result != null) {93    return result;94  }95  let stat;96  try {97    // @ts-expect-error TS2554 - throwIfNoEntry is only available in recent version of node, but inclusion of the option is a backward compatible no-op.98    stat = fs().statSync(path, {99      throwIfNoEntry: false100    });101  } catch (e) {102    if (!(e && (e.code === 'ENOENT' || e.code === 'ENOTDIR'))) {103      throw e;104    }105  }106  if (stat) {107    if (stat.isFile() || stat.isFIFO()) {108      checkedPaths.set(path, IPathType.FILE);109      return IPathType.FILE;110    } else if (stat.isDirectory()) {111      checkedPaths.set(path, IPathType.DIRECTORY);112      return IPathType.DIRECTORY;113    }114  }115  checkedPaths.set(path, IPathType.OTHER);116  return IPathType.OTHER;117}118const checkedRealpathPaths = new Map();119function realpathCached(path) {120  let result = checkedRealpathPaths.get(path);121  if (result != null) {122    return result;123  }124  result = (0, _jestUtil().tryRealpath)(path);125  checkedRealpathPaths.set(path, result);126  if (path !== result) {127    // also cache the result in case it's ever referenced directly - no reason to `realpath` that as well128    checkedRealpathPaths.set(result, result);129  }130  return result;131}132const packageContents = new Map();133function readPackageCached(path) {134  let result = packageContents.get(path);135  if (result != null) {136    return result;137  }138  result = JSON.parse(fs().readFileSync(path, 'utf8'));139  packageContents.set(path, result);140  return result;141} // adapted from142// https://github.com/lukeed/escalade/blob/2477005062cdbd8407afc90d3f48f4930354252b/src/sync.js143// to use cached `fs` calls144function findClosestPackageJson(start) {145  let dir = (0, _path().resolve)('.', start);146  if (!isDirectory(dir)) {147    dir = (0, _path().dirname)(dir);148  }149  while (true) {150    const pkgJsonFile = (0, _path().resolve)(dir, './package.json');151    const hasPackageJson = isFile(pkgJsonFile);152    if (hasPackageJson) {153      return pkgJsonFile;154    }155    const prevDir = dir;156    dir = (0, _path().dirname)(dir);157    if (prevDir === dir) {158      return undefined;159    }160  }161}162/*163 * helper functions164 */165function isFile(file) {166  return statSyncCached(file) === IPathType.FILE;167}168function isDirectory(dir) {169  return statSyncCached(dir) === IPathType.DIRECTORY;170}171function realpathSync(file) {172  return realpathCached(file);...

defaultResolver.js

Source:defaultResolver.js

...109  IPathType[(IPathType['DIRECTORY'] = 2)] = 'DIRECTORY';110  IPathType[(IPathType['OTHER'] = 3)] = 'OTHER';111})(IPathType || (IPathType = {}));112const checkedPaths = new Map();113function statSyncCached(path) {114  const result = checkedPaths.get(path);115  if (result !== undefined) {116    return result;117  }118  let stat;119  try {120    stat = fs().statSync(path);121  } catch (e) {122    if (!(e && (e.code === 'ENOENT' || e.code === 'ENOTDIR'))) {123      throw e;124    }125  }126  if (stat) {127    if (stat.isFile() || stat.isFIFO()) {128      checkedPaths.set(path, IPathType.FILE);129      return IPathType.FILE;130    } else if (stat.isDirectory()) {131      checkedPaths.set(path, IPathType.DIRECTORY);132      return IPathType.DIRECTORY;133    }134  }135  checkedPaths.set(path, IPathType.OTHER);136  return IPathType.OTHER;137}138const checkedRealpathPaths = new Map();139function realpathCached(path) {140  let result = checkedRealpathPaths.get(path);141  if (result !== undefined) {142    return result;143  }144  result = (0, _jestUtil().tryRealpath)(path);145  checkedRealpathPaths.set(path, result);146  if (path !== result) {147    // also cache the result in case it's ever referenced directly - no reason to `realpath` that as well148    checkedRealpathPaths.set(result, result);149  }150  return result;151}152/*153 * helper functions154 */155function isFile(file) {156  return statSyncCached(file) === IPathType.FILE;157}158function isDirectory(dir) {159  return statSyncCached(dir) === IPathType.DIRECTORY;160}161function realpathSync(file) {162  return realpathCached(file);...

Jest Testing Tutorial

LambdaTest’s Jest Testing Tutorial covers step-by-step guides around Jest with code examples to help you be proficient with the Jest framework. The Jest tutorial has chapters to help you learn right from the basics of Jest framework to code-based tutorials around testing react apps with Jest, perform snapshot testing, import ES modules and more.

Chapters

What is Jest Framework
Advantages of Jest - Jest has 3,898,000 GitHub repositories, as mentioned on its official website. Learn what makes Jest special and why Jest has gained popularity among the testing and developer community.
Jest Installation - All the prerequisites and set up steps needed to help you start Jest automation testing.
Using Jest with NodeJS Project - Learn how to leverage Jest framework to automate testing using a NodeJS Project.
Writing First Test for Jest Framework - Get started with code-based tutorial to help you write and execute your first Jest framework testing script.
Jest Vocabulary - Learn the industry renowned and official jargons of the Jest framework by digging deep into the Jest vocabulary.
Unit Testing with Jest - Step-by-step tutorial to help you execute unit testing with Jest framework.
Jest Basics - Learn about the most pivotal and basic features which makes Jest special.
Jest Parameterized Tests - Avoid code duplication and fasten automation testing with Jest using parameterized tests. Parameterization allows you to trigger the same test scenario over different test configurations by incorporating parameters.
Jest Matchers - Enforce assertions better with the help of matchers. Matchers help you compare the actual output with the expected one. Here is an example to see if the object is acquired from the correct class or not. -

|it('check_object_of_Car', () => { expect(newCar()).toBeInstanceOf(Car); });| | :- |

Jest Hooks: Setup and Teardown - Learn how to set up conditions which needs to be followed by the test execution and incorporate a tear down function to free resources after the execution is complete.
Jest Code Coverage - Unsure there is no code left unchecked in your application. Jest gives a specific flag called --coverage to help you generate code coverage.
HTML Report Generation - Learn how to create a comprehensive HTML report based on your Jest test execution.
Testing React app using Jest Framework - Learn how to test your react web-application with Jest framework in this detailed Jest tutorial.
Test using LambdaTest cloud Selenium Grid - Run your Jest testing script over LambdaTest cloud-based platform and leverage parallel testing to help trim down your test execution time.
Snapshot Testing for React Front Ends - Capture screenshots of your react based web-application and compare them automatically for visual anomalies with the help of Jest tutorial.
Bonus: Import ES modules with Jest - ES modules are also known as ECMAScript modules. Learn how to best use them by importing in your Jest testing scripts.
Jest vs Mocha vs Jasmine - Learn the key differences between the most popular JavaScript-based testing frameworks i.e. Jest, Mocha, and Jasmine.
Jest FAQs(Frequently Asked Questions) - Explore the most commonly asked questions around Jest framework, with their answers.