no-deprecated-functions.md

Disallow use of deprecated functions (no-deprecated-functions)

Over the years Jest has accrued some debt in the form of functions that have either been renamed for clarity, or replaced with more powerful APIs.

While typically these deprecated functions are kept in the codebase for a number of majors, eventually they are removed completely.

Rule details

This rule warns about calls to deprecated functions, and provides details on what to replace them with, based on the version of Jest that is installed.

This rule can also autofix a number of these deprecations for you.

jest.resetModuleRegistry

This function was renamed to resetModules in Jest 15, and is scheduled for removal in Jest 27.

jest.addMatchers

This function was replaced with expect.extend in Jest 17, and is scheduled for removal in Jest 27.

require.requireActual & require.requireMock

These functions were replaced in Jest 21 and removed in Jest 26.

Originally, the requireActual & requireMock the requireActual& requireMock functions were placed onto the require function.

These functions were later moved onto the jest object in order to be easier for type checkers to handle, and their use via require deprecated. Finally, the release of Jest 26 saw them removed from the require function all together.

jest.runTimersToTime

This function was renamed to advanceTimersByTime in Jest 22, and is scheduled for removal in Jest 27.

jest.genMockFromModule

This function was renamed to createMockFromModule in Jest 26, and is scheduled for removal in a future version of Jest.