Update dependency jest-when to v4 by backstage-goalie[bot] · Pull Request #8563 · backstage/community-plugins

backstage-goalie · 2026-04-14T20:26:10Z

This PR contains the following updates:

Package	Change	Age	Confidence
jest-when	`^3.1.0` → `^4.0.0`

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Release Notes

timkindberg/jest-when (jest-when)

`v4.0.3`

Compare Source

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)

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.

`v3.7.0`

Compare Source

Support resetting of specific calledWith mocks ce60dd5 (closes #108)

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backstage-goalie · 2026-04-14T20:26:48Z

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage-community/plugin-kafka-backend	workspaces/kafka/plugins/kafka-backend	patch	`v0.11.0`
@backstage-community/plugin-kafka	workspaces/kafka/plugins/kafka	patch	`v0.12.0`

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backstage-service · 2026-05-06T07:04:12Z

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backstage-goalie · 2026-05-08T05:53:42Z

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backstage-goalie Bot added the dependencies Pull requests that update a dependency file label Apr 14, 2026

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Update dependency jest-when to v4

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backstage-goalie Bot commented Apr 14, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Release Notes

v4.0.3

Fixes

v4.0.2

v4.0.1

v4.0.0: 4.0.0

Highlights

What changed

Native TypeScript source

Stronger, more accurate typings

Compatibility guardrails

Breaking changes

Thanks

v3.7.0

Configuration

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backstage-goalie Bot commented Apr 14, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Changed Packages

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backstage-goalie Bot commented Apr 14, 2026 •

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`v4.0.3`

`v4.0.2`

`v4.0.1`

`v4.0.0`: 4.0.0

`v3.7.0`

backstage-goalie Bot commented Apr 14, 2026 •

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