babel-plugin-jest-hoist
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Package description
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.
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.');"Similar to babel-plugin-jest-hoist, babel-plugin-rewire allows for modifying module internals, such as variables and functions, for testing purposes. However, it focuses on enabling the rewire functionality rather than specifically working with Jest's global methods.
While ts-jest is a TypeScript preprocessor with source map support for Jest that lets you use Jest to test projects written in TypeScript, it includes features for handling module mocking and hoisting in a way that's compatible with TypeScript, offering a similar but TypeScript-focused functionality.
Changelog
25.5.0
[@jest/globals] New package so Jest's globals can be explicitly imported (#9801)[jest-core] Show coverage of sources related to tests in changed files (#9769)[jest-runtime] Populate require.cache (#9841)[*] Use graceful-fs directly in every package instead of relying on fs being monkey patched (#9443)[expect] Prints the Symbol name into the error message with a custom asymmetric matcher (#9888)[jest-circus, jest-jasmine2] Support older version of jest-runtime (#9903 & #9842)[@jest/environment] Make sure not to reference Jest types (#9875)[jest-message-util] Code frame printing should respect --noStackTrace flag (#9866)[jest-runtime] Support importing CJS from ESM using import statements (#9850)[jest-runtime] Support importing parallel dynamic imports (#9858)[jest-transform] Improve source map handling when instrumenting transformed code (#9811)[docs] Add an example for mocking non-default export class[jest-resolve] Update resolve to a version using native realpath, which is faster than the default JS implementation (#9872)[jest-resolve] Pass custom cached realpath function to resolve (#9873)[jest-runtime] Add teardown method to clear any caches when tests complete (#9906)[jest-runtime] Do not pass files required internally through transformation when loading them (#9900)[jest-runtime] Use Maps instead of object literals as cache holders (#9901)Readme
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.
$ yarn add --dev babel-plugin-jest-hoist
babel.config.js (Recommended)module.exports = {
plugins: ['jest-hoist'],
};
$ babel --plugins jest-hoist script.js
require('@babel/core').transform('code', {
plugins: ['jest-hoist'],
});
FAQs
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/jestjs/jest/tree/main/packages/babel-jest).
We found that babel-plugin-jest-hoist demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 6 open source maintainers collaborating on the project.
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