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babel-plugin-jest-hoist

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    babel-plugin-jest-hoist

Babel plugin to hoist `jest.disableAutomock`, `jest.enableAutomock`, `jest.unmock`, `jest.mock`, calls above `import` statements. This plugin is automatically included when using [babel-jest](https://github.com/facebook/jest/tree/main/packages/babel-jest)


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Package description

What is babel-plugin-jest-hoist?

The babel-plugin-jest-hoist npm package is designed to work with Jest, a popular JavaScript testing framework. It allows Jest to hoist `jest.mock`, `jest.unmock`, `jest.enableAutomock`, `jest.disableAutomock`, `jest.useFakeTimers`, `jest.useRealTimers`, `jest.setMock`, and `jest.clearAllMocks` calls to the top of the file. This is necessary because Jest needs to isolate modules for mocking before they are used in tests, and doing so manually can be error-prone and tedious.

What are babel-plugin-jest-hoist's main functionalities?

Hoisting jest.mock calls

Automatically hoists `jest.mock` calls to the top of the file, ensuring that modules are mocked before any other code execution.

"use strict";\njest.mock('moduleName');\nconsole.log('This is a test.');"

Hoisting jest.useFakeTimers calls

Automatically hoists `jest.useFakeTimers` calls to the top, allowing tests to use fake timers from the start.

"use strict";\njest.useFakeTimers();\nconsole.log('This is a test with fake timers.');"

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Changelog

Source

29.2.0

Features

  • [@jest/cli, jest-config] A seed for the test run will be randomly generated, or set by a CLI option (#13400)
  • [@jest/cli, jest-config] --show-seed will display the seed value in the report, and can be set via a CLI flag or through the config file (#13400)
  • [jest-config] Add readInitialConfig utility function (#13356)
  • [jest-core] Allow testResultsProcessor to be async (#13343)
  • [@jest/environment, jest-environment-node, jest-environment-jsdom, jest-runtime] Add getSeed() to the jest object (#13400)
  • [expect, @jest/expect-utils] Allow isA utility to take a type argument (#13355)
  • [expect] Expose AsyncExpectationResult and SyncExpectationResult types (#13411)

Fixes

  • [babel-plugin-jest-hoist] Ignore TSTypeQuery when checking for hoisted references (#13367)
  • [jest-core] Fix detectOpenHandles false positives for some special objects such as TLSWRAP (#13414)
  • [jest-mock] Fix mocking of getters and setters on classes (#13398)
  • [jest-reporters] Revert: Transform file paths into hyperlinks (#13399)
  • [@jest/types] Infer type of each table correctly when the table is a tuple or array (#13381)
  • [@jest/types] Rework typings to allow the *ReturnedWith matchers to be called with no argument (#13385)

Chore & Maintenance

  • [*] Update @babel/* deps, resulting in slightly different stack traces for each (#13422)

Performance

  • [jest-runner] Do not instrument v8 coverage data if coverage should not be collected (#13282)

Readme

Source

babel-plugin-jest-hoist

Babel plugin to hoist jest.disableAutomock, jest.enableAutomock, jest.unmock, jest.mock, calls above import statements. This plugin is automatically included when using babel-jest.

Installation

$ yarn add --dev babel-plugin-jest-hoist

Usage

module.exports = {
  plugins: ['jest-hoist'],
};

Via CLI

$ babel --plugins jest-hoist script.js

Via Node API

require('@babel/core').transform('code', {
  plugins: ['jest-hoist'],
});

FAQs

Last updated on 14 Oct 2022

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