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Jest v0.7.0 Release Notes

    • 🛠 Fixed a memory leak with test contexts. Jest now properly cleans up test environments after each test. Added --logHeapUsage to log memory usage after each test. Note: this is option is meant for debugging memory leaks and might significantly slow down your test run.
    • ✂ Removed mock-modules, node-haste and mocks virtual modules. This is a breaking change of undocumented public API. Usage of this API can safely be automatically updated through an automated codemod:
    • Example: http://astexplorer.net/#/zrybZ6UvRA
    • ⚡️ Codemod: https://github.com/cpojer/js-codemod/blob/main/transforms/jest-update.js
    • jscodeshift: https://github.com/facebook/jscodeshift
    • ✂ Removed navigator.onLine and mockSetReadOnlyProperty from the global jsdom environment. Use window.navigator.onLine = true; in your test setup and Object.defineProperty instead.