@lwc/jest-preset

19.6.1 · 15 Apr 2026MIT175.4k / weekRepository Homepage npm Atom feed

Same major only

109 releases in betweennotes for 28

Other targets from 0.34.3Newest 0.x0.40.1

9.0.0, 8.0.0, 7.0.0, 6.0.0, 5.0.0, 4.0.0, 3.0.0, 2.0.0, 1.0.0 have no release note on GitHub or in the repository's changelog, so their breaking changes are missing from the counts below.

8+
changes to make: 0
advisories fixed: 13+
new: 19+
fixes

Counted from 28 of 109 release notes. Advisories are counted from the advisory database, in full.

Before you upgrade

Tick each one off as you go

class attributes are now whitespace-normalized (trimmed and single-spaces only)
breaking15.0.0
style attributes are similarly normalized, with a terminating ; for each individual style. In addition, invalid styles are now omitted (e.g. color: foobar), and property values may be normalized (e.g. color: #FFFFFF becomes color: rgb(255, 255, 255);).
breaking15.0.0
Remove id/idref serialization (BREAKING CHANGE)
breaking13.0.0
Make snapshots resilient to whitespace changes (BREAKING CHANGE)
breaking13.0.0
All LWC peerDependencies (@lwc/synthetic-shadow, @lwc/engine-dom, etc.) are now required to be v2.48.0 or later.
breaking12.0.0
Classes/attributes that LWC uses to scope CSS are now replaced in snapshots with (__lwc_scope_token__). Run yarn test -u to update your snapshots.
breaking12.0.0
Remove fallback synthetic shadow import (BREAKING CHANGE)
breaking12.0.0
#105: Dropping support for Jest 25. With this PR, the minimum supported version of Jest will be 26.0
breaking10.0.0

Release by release

18.0.0 – 19.6.116 releases, nothing new or fixed; 11 without a note
17.0.1
6 Sep 20243 new
- new
  Introduced a new preset for SSR server-side.
- new
  Introduced a new preset for SSR hydration.
- new
  Implemented a new API for storing SSR-generated markup with a hash in a snapshot file and reading the markup associated with the hash.
16.0.1 – 16.1.04 releases, nothing new or fixed; 3 without a note
16.0.0
11 Apr 20241 fix
- fixed
  Fix excessive __lwc_scope_token__ replacement
15.0.0
8 Apr 20242 fixes
- fixed
  serializer: Normalize class attributes
- fixed
  serializer: Normalize style attributes
14.2.1 – 14.4.04 releases, nothing new or fixed; 3 without a note
14.2.0
10 Nov 20231 new
- new
  Add support for import.meta properties @W-14387292
14.1.1no release note

13 other lines we could not sort, mostly version bumps

@ W-17249293 consle warn spy bug fix
19.1.0
@W-16647806 log compiler warning during jest tests
19.1.0
@W-17983974 add SSRv2 support for unit testing
19.1.0
Dropped Jest v.26 and v.27.
17.0.1
nucleus/upstream_project_lwc_version_7.2.0_update_100
16.1.0
nucleus/upstream_project_lwc_version_7.2.1_update_991
16.1.0
Update @salesforce/apex/* imports to return jest.fn()
16.1.0
Spring 23 release
11.5.4
Upgrade packages in #148, #150, #149, #151
11.4.0
#106: Clean up wdio eslint entry.
10.0.0

14 internal lines (docs, tests, tooling) left out.

Upgrade to 19.6.1

npm install @lwc/jest-preset@19.6.1

What 19.6.1 needs

Reading 19.6.1's manifest…

Check against your package.json

Which of your other dependencies stand in the way of 19.6.1. Read once, not stored.

After upgrading

Run the type checker, the linter and the tests.
Build, and look for new deprecation warnings.
Update peer dependencies the new version asks for.

Upgrading @lwc/jest-preset from 0.34.3 to 19.6.1

Before you upgrade

Release by release

17.0.1

16.0.0

15.0.0

14.2.0