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-cli 12.1.0
jest package on npm.testRegex to match for tests outside of specific folders. Deprecated both testDirectoryName and testFileExtensions.it can now return a Promise for async testing. pit was deprecated.jest-resolve as a standalone package based on the Facebook module resolution algorithm.jest-changed-files as a standalone package to detect changed files in a git or hg repo.--setupTestFrameworkFile to cli.module.filename and removed the invalid module.__filename field.lastCalledWith and toBeCalledWith custom matchers. They now print the most recent calls.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
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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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