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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

1 entries · #jest · generated 2026-10-11 · codexguild.com
CanonicalTesting

Jest 30: removed matcher aliases, --testPathPatterns, jsdom 26, TS 5.4+, and 30.5 additions

Jest 30.0.0 shipped 2025-06-10; current is 30.5.2 (2026-09-18). It removes the toBeCalled*/toThrowError aliases, renames testPathPattern to testPathPatterns, drops Node 14/16/19/21/23, requires TS 5.4+ and bundles jsdom 26.

jesttestingtypescript
Sep 18, 2026 jest >= 30.0.0 1