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agentic-dev/docs/library-decisions/2026-05-14-@testing-library/user-event.md
Danijel Martinek 1108e24ea0 chore(deps): backfill library traces for un-cited cluster
Add approved trace files for payload, @trpc/server, @trpc/client, zod,
superjson, @payloadcms/db-postgres, @payloadcms/richtext-lexical, globals,
react, react-dom, vitest, @tanstack/react-query, and all @testing-library/*
packages. All traces dated 2026-05-14, decision: approved, adr: null.

Establishes the baseline so the pre-commit library-decisions gate is
additive (new deps require traces) rather than disruptive (old deps fail
immediately). All 34 trace files pass validateTrace() from schema.mjs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-14 10:10:23 +00:00

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---
package: "@testing-library/user-event"
version: "^14.5.0"
tier: core
decision: approved
date: 2026-05-14
deciders: [Danijel Martinek]
adr: null
filter-results:
license: MIT
types: native
maintenance: active
boundary-fit: pass
shadow-check: pass
eu-residency: n/a
cve-scan: clean
named-consumer: pass
verification-commands:
- npm view @testing-library/user-event license
- npm view @testing-library/user-event version
- pnpm audit --audit-level=moderate
accepted-cves: []
---
## Filter: license
<!-- Result: MIT -->
`npm view @testing-library/user-event license` returns `MIT`. MIT is on the allowlist.
## Filter: types
<!-- Result: native -->
`@testing-library/user-event` ships its own TypeScript declaration files. No separate `@types/` package is needed.
## Filter: maintenance
<!-- Result: active -->
Actively maintained by the Testing Library organization. The 14.x line is the current major. Regular releases.
## Filter: boundary-fit
<!-- Result: pass -->
`@testing-library/user-event` is a dependency of `@repo/core-testing`, the workspace's shared testing infrastructure. It provides realistic user interaction simulation (`userEvent.click`, `userEvent.type`, etc.) that more accurately models browser behavior than `fireEvent`. This is the correct placement for shared test infrastructure.
## Filter: shadow-check
<!-- Result: pass -->
`@testing-library/user-event` is the sole user interaction simulation library in the workspace. No competing library is present.
## Filter: eu-residency
<!-- Result: n/a -->
`@testing-library/user-event` is a test utility library with no network communication. EU residency does not apply.
## Filter: cve-scan
<!-- Result: clean -->
`pnpm audit --audit-level=moderate` reports no advisories against `@testing-library/user-event` at the time of this trace.
## Filter: named-consumer
<!-- Result: pass -->
`@repo/core-testing` uses `@testing-library/user-event` to provide realistic interaction utilities for component tests. Feature packages with interactive UI components use these via `core-testing`. Named, non-hypothetical consumer exists today.
## Prompt: replaces
`@testing-library/user-event` replaces `@testing-library/dom`'s `fireEvent` for interaction tests. `userEvent` simulates the full browser event sequence (pointerdown → mousedown → focus → click → pointerup → mouseup) rather than dispatching a single synthetic event, producing more faithful integration tests.
## Prompt: migration-cost-out
Low. `@testing-library/user-event` is used in component tests alongside `@testing-library/react`. Removing it requires downgrading interaction tests to `fireEvent` calls — a mechanical change but a loss of test fidelity.
## Prompt: alternatives-considered
1. **`fireEvent` only** — Simpler but fires only one synthetic event per interaction; misses focus/blur and keyboard event sequences that real browsers emit.
2. **Playwright component testing** — Full browser testing is reserved for e2e (`pnpm test:e2e`); `userEvent` is the right tool for unit/integration component tests.