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agentic-dev/docs/library-decisions/2026-05-14-superjson.md
Danijel Martinek f77e6ea881 chore(template): clean-slate template snapshot from bb4a0c7 
Curated, product-agnostic snapshot of the post-story-04 tree: demo
content deleted, auth-only reference feature, web-next shell, all gates
green. Product-specific docs, ADRs 027-029, PRDs/epics/archive, editor
library traces, and product naming are curated out; generic template
repairs (coverage provider devDeps, root test:coverage script, live
lint fixes, root-only release-please) are kept. See TEMPLATE.md for
provenance, curation list, and usage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK
2026-07-12 20:40:54 +02:00

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package, version, tier, decision, date, deciders, adr, lastRevalidated, is-sub-processor, processes-pii, filter-results, verification-commands, accepted-cves
package version tier decision date deciders adr lastRevalidated is-sub-processor processes-pii filter-results verification-commands accepted-cves
superjson ^2.2.1 core approved 2026-05-14
Danijel Martinek
null null false false
license types maintenance boundary-fit shadow-check eu-residency cve-scan named-consumer socketRisk
MIT native active pass pass n/a clean pass clean
npm view superjson license
npm view superjson version
pnpm audit --audit-level=moderate

Filter: license

npm view superjson license returns MIT. MIT is on the allowlist.

Filter: types

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

Filter: maintenance

Actively maintained. Last release < 18 months. Used widely in the tRPC and Next.js ecosystem.

Filter: boundary-fit

superjson is the serialization transformer used by the tRPC layer (@repo/core-shared) to handle non-JSON-serializable types (Dates, Maps, Sets) over the wire. core-testing uses it for mock tRPC client setup. No boundary rules restrict superjson to a specific tier.

Filter: shadow-check

superjson is the sole tRPC-compatible serialization transformer in the workspace. No competing serializer (devalue, msgpackr, etc.) is present.

Filter: eu-residency

superjson is a pure serialization library with no network communication, telemetry, or data transmission. EU residency does not apply.

Filter: cve-scan

pnpm audit --audit-level=moderate reports no advisories against superjson at the time of this trace.

Filter: named-consumer

@repo/core-shared uses superjson as the tRPC transformer. @repo/core-testing uses superjson for mock tRPC client configuration. Named, non-hypothetical consumers exist today.

Prompt: replaces

superjson replaces the default JSON-only serialization in tRPC, which would fail silently when Date objects or other non-JSON types are passed through procedure calls.

Prompt: migration-cost-out

Low. superjson is used as the transformer option in the tRPC router and client configuration — two call sites in core-shared. Replacing it requires swapping the transformer and ensuring the replacement handles the same non-JSON types. No feature package references superjson directly.

Prompt: alternatives-considered

  1. devalue — Supports more types but is less mature in the tRPC ecosystem; superjson is the de-facto tRPC transformer standard.
  2. JSON-only (no transformer) — Rejected because it silently loses type fidelity for Dates and breaks any use case that returns or receives a Date value.