npm / @pinia/testing

@pinia/testing

What changed in @pinia/testing 3 to 4, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-19.

2 breaking1 new APIs and options1 behavior and defaults3 tooling10 fixes and other

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

@pinia/testing 415 changes

Pinia 4 is ESM only, which affects how projects can load the package.
4.0.0release notes
The devtools API is upgraded to v8 and must be installed alongside pinia.
4.0.0release notes

piniaSymbol is now exported for use by developers.
2.0.0, 4.0.0release notes release notes

Errors and development warnings are refactored with Nostics to make detected problems easier to fix.
4.0.0release notes
Settable getters (computed) are now editable in devtools.
2.0.0, 4.0.0release notes release notes
Invalid properties passed to storeToRefs now produce a diagnostic.
2.0.0, 4.0.0release notes release notes

Shallow refs are now notified when applying the initial state in testing.
2.0.2, 4.1.0release notes release notes
During hydration, reactive Set and Map state is replaced instead of unioned.
4.0.3release notes
Types avoid treating a name ending in .vue as reserved.
4.0.3release notes
The missing types exports field was re-added, restoring the package’s type exports.
2.0.1, 4.0.1release notes release notes
Incorrect values in plugins now produce a diagnostic.
2.0.0, 4.0.0release notes release notes
HMR now preserves runtime-added properties of setup store refs.
2.0.0, 4.0.0release notes release notes
shouldHydrate now respects the skipHydrate marker on non-plain objects.
2.0.0, 4.0.0release notes release notes
Nullish values are now skipped when using storeToRefs.
2.0.0, 4.0.0release notes release notes
Subscribing the same callback twice no longer creates a duplicate watcher.
2.0.0, 4.0.0release notes release notes

Pinia now detects global context on the server side and warns about it.
3.0.4release notes