[dependabot]

Bumps jest-when from 3.7.0 to 4.0.3.

Release notes

Sourced from jest-when's releases.

v4.0.3

Fixes

• Restore pre-v4 behavior where .defaultImplementation() (and aliases .defaultReturnValue() / .defaultResolvedValue() / .defaultRejectedValue()) no longer silently drops prior bare .calledWith() / .calledWith(undefined, ...) registrations. Regression introduced in the v4 TypeScript port (#111) and fixed by restoring the NO_CALLED_WITH_YET symbol sentinel. Thanks @​rbnayax. (#115, #116)

4.0.0

Highlights

• jest-when is now authored in TypeScript
• fixes a number of long-standing typing issues, especially around wrapper mocks, calledWith inference, and void / Promise<void> cases
• compatibility is now verified in both Jest 29 and Jest 27 environments

What changed

Native TypeScript source

The library source has been migrated from JavaScript to TypeScript, with the public type contract now tested directly in the repo.

Stronger, more accurate typings

This release tightens a number of important typing behaviors:

• calledWith / expectCalledWith preserve argument tuple types again
• mockReturnValue / mockResolvedValue / related methods track the mocked function's return type much more accurately
• void / Promise<void> cases allow omitted values correctly
• better support for function-like wrapper mocks, including jest-mock-extended-style mocked object methods
• typed casts, mocked module functions, spies, optional args, rest args, allArgs, and matcher cases are now covered by contract tests

Compatibility guardrails

The repo now has:

• a primary Jest 29 development environment
• a dedicated compat/jest27 workspace

The full build, runtime tests, and type tests run in both environments. This was added specifically to avoid fixing newer Jest/mock ecosystems while regressing older supported ones.

Breaking changes

• minimum supported Jest version is now 27
• TypeScript usages that previously compiled because the old typings were too loose may now fail typechecking

There are no intentional runtime API changes in this release.

Thanks

Thanks to @​tlevesque-ueat for the repros, patience, and repeated validation while this got sorted out.

Convert to TypeScript

• feat: Convert jest-when to TypeScript with excellent type inference 5201c3e

... (truncated)

Commits

• ee1c702 v4.0.3
• 49c177a Add tests for preserving calledWith() registrations when setting defa… (#116)
• 9e4d81f regression: .defaultImplementation() silently dropped prior bare .calledWith(...
• 357e3d3 v4.0.2
• 56299ba fix(types): resolve generic conditional return types (#114)
• e7132bd 4.0.1
• 710cee6 docs: refresh README and tighten published API surface
• 70555be 4.0.0
• 142f297 feat: Convert jest-when to TypeScript with excellent type inference (#111)
• See full diff in compare view

Install script changes

This version adds prepare script that runs during installation. Review the package contents before updating.

Note
Automatic rebases have been disabled on this pull request as it has been open for over 30 days.