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
jest 18.0.0
See https://jestjs.io/blog/2016/12/15/2016-in-jest
pit and mockImpl. Use it or mockImplementation instead.--bail is used together with --watch.pretty-format is now merged into Jest.require('v8') now works properly in a test context.expect.any, expect.anything, expect.objectContaining, expect.arrayContaining, expect.stringMatching.snapshotSerializers, setupFiles, transform, testRunner and testResultsProcessor instead of using path.resolve.--testResultsProcessor is now exposed through the cli.--jsonOutputFile to --outputFile.jest-editor-support for vscode and Nuclide integration.test.concurrent unhandled promise rejections.testRegex to include test.js and spec.js files.babel-plugin-jest-hoist when using jest.mock with three arguments.JSON global in jest-environment-node now comes from the vm context instead of the parent context.FakeTimers.useTimers() is called.JEST_HIDE_USAGE.expect.assertions(number) which will ensure that a specified amount of assertions is made in one test..toMatchSnapshot(?string) feature to give snapshots a name.jest-react-native was deprecated and now forwards react-native..toMatchObject matcher.NaN% Failed in the OS notification when using --notify..toHaveProperty matcher.Map/Set comparisons.test.concurrent now works with --testNamePattern.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.
$ npm install babel-plugin-jest-hoist
.babelrc (Recommended).babelrc
{
"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).
The npm package babel-plugin-jest-hoist receives a total of 18,669,885 weekly downloads. As such, babel-plugin-jest-hoist popularity was classified as popular.
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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