Generator-emitted scaffold (pnpm turbo gen core-package realtime) plus the story-00-precedent coverage repairs (coverage provider devDep, symbols.ts exclude + tested allowlist mirror) and three minimal tests covering generator-emitted realtime code the template suite misses. Squash of 31d85e0 + review-fix cf11b38. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK
73 lines
1.9 KiB
Markdown
73 lines
1.9 KiB
Markdown
---
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package: socket.io
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version: "^4.7.0"
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tier: core
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decision: approved
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date: 2026-05-14
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deciders: [scaffolded]
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adr: adr-016
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filter-results:
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license: MIT
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types: native
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maintenance: active
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boundary-fit: pass
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shadow-check: pass
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eu-residency: self-hostable
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cve-scan: clean
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named-consumer: pass
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verification-commands:
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- pnpm audit --audit-level=moderate
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- npm view socket.io license
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accepted-cves: []
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---
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## Filter: license
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MIT — on the workspace allowlist.
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## Filter: types
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Ships first-party TypeScript types in its distribution.
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## Filter: maintenance
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Active. Maintained by the Socket.IO team; frequent releases and active issue tracker.
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## Filter: maintenance
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Active. Regular releases; widely deployed in production.
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## Filter: boundary-fit
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ADR-016 §R2 explicitly designates `core-realtime` as the sole allowed home for `socket.io`. Boundary rule `no-direct-socket-io` enforces this in ESLint.
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## Filter: shadow-check
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No competing realtime transport in the workspace. No shadow.
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## Filter: eu-residency
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Self-hosted server; the library itself does not transmit data to any vendor endpoint.
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## Filter: cve-scan
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No advisories at adoption time.
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## Filter: named-consumer
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`core-realtime` wraps socket.io to provide the `IRealtimeServer` abstraction (ADR-016).
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## Prompt: replaces
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Nothing — this is the initial realtime scaffolding. No prior transport to retire.
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## Prompt: migration-cost-out
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Hard: channel descriptors, handler signatures, and server-side broadcast API are all shaped around socket.io semantics. Replacing requires re-implementing the abstraction layer.
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## Prompt: alternatives-considered
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1. **ws** — lower-level, no rooms or namespaces; would require significant protocol work.
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2. **Ably / Pusher** — vendor-hosted; eu-residency risk and ongoing cost.
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Socket.IO is the established standard for this use-case and is fully self-hostable.
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