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agentic-dev/docs/library-decisions/2026-05-14-@trpc/client.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, version, tier, decision, date, deciders, adr, filter-results, verification-commands, accepted-cves
package version tier decision date deciders adr filter-results verification-commands accepted-cves
@trpc/client ^11.0.0 core approved 2026-05-14
Danijel Martinek
null
license types maintenance boundary-fit shadow-check eu-residency cve-scan named-consumer
MIT native active pass pass n/a clean pass
npm view @trpc/client license
npm view @trpc/client version
pnpm audit --audit-level=moderate

Filter: license

npm view @trpc/client license returns MIT. MIT is on the allowlist.

Filter: types

@trpc/client is authored in TypeScript and ships its own .d.ts declaration files. No separate @types/ package is needed.

Filter: maintenance

Actively maintained alongside @trpc/server by the tRPC team. Versioned and released together with the server package.

Filter: boundary-fit

@trpc/client is used in @repo/core-testing to provide a mock tRPC client for test setups. This is the correct tier for test infrastructure utilities. No boundary rule restricts @trpc/client usage here.

Filter: shadow-check

@trpc/client is the sole tRPC client implementation in the workspace. No competing client adapter is present.

Filter: eu-residency

@trpc/client is a pure client-side RPC library with no vendor-controlled network endpoints. EU residency does not apply.

Filter: cve-scan

pnpm audit --audit-level=moderate reports no advisories against @trpc/client at the time of this trace.

Filter: named-consumer

@repo/core-testing uses @trpc/client to build the mock tRPC client used in integration test setups. Named, non-hypothetical consumer exists today.

Prompt: replaces

@trpc/client is the natural companion to @trpc/server; no alternative client approach was evaluated separately. Using @trpc/client ensures the test setup mirrors the production client configuration.

Prompt: migration-cost-out

Low. @trpc/client is confined to @repo/core-testing's test utilities. Migrating out requires updating the mock client setup in one package. Feature packages reference tRPC types from @trpc/server, not @trpc/client.

Prompt: alternatives-considered

  1. Direct HTTP fetch in tests — Rejected: bypasses tRPC middleware and type inference, making tests less representative of real client behavior.
  2. @trpc/server createCaller (server-side calling) — Valid alternative for pure unit tests; @trpc/client is used where the test needs to exercise the actual HTTP transport or client link chain.