# WRNexusJS 0.3 — 40-Point Implementation Matrix

Legend:

- **Existing + hardened**: capability already existed and was preserved or extended
- **Implemented**: new usable public API/runtime behavior in 0.3
- **Foundation / experimental**: contract and integration seam exist; advanced provider-specific
  implementations should remain opt-in until they receive production soak testing

|   # | Improvement                     | 0.3 implementation                                                                                                                | Level                     |
| --: | ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------- | ------------------------- |
|   1 | Formal language specification   | Canonical spec constants, stable diagnostics, and `docs/WRN-LANGUAGE-SPEC-1.0.md`                                                 | Implemented               |
|   2 | Shared parser and AST           | New `@wrnexus/syntax`; compiler compatibility re-exports                                                                          | Implemented               |
|   3 | Compile-time/runtime separation | Runtime metadata, server-only suppression, compile-time diagnostics and transforms                                                | Existing + hardened       |
|   4 | Fine-grained reactivity         | Batched signals, dependency-tracked computed/effects, coalesced renderers                                                         | Implemented               |
|   5 | Deterministic SSR/hydration     | Stable hydration IDs, runtime/strategy metadata, mismatch diagnostics, keyed `data-for` reconciliation and keyed `{#each}` syntax | Implemented               |
|   6 | Partial hydration/islands       | load/idle/visible/interaction/media/none strategies                                                                               | Implemented               |
|   7 | Server-only execution           | `runtime = "server"`, `load server`, browser-interactivity rejection                                                              | Implemented               |
|   8 | Data-loading model              | `defineLoader`, `defineAction`, request-local dedupe, WRN loaders/actions                                                         | Foundation / experimental |
|   9 | Streaming SSR                   | Promise and `AsyncIterable` document streams and response helper                                                                  | Implemented               |
|  10 | Routing                         | groups, optional and catch-all params, conflict checks, typed builders                                                            | Implemented               |
|  11 | Middleware                      | Existing ordered middleware plus tracing and tenancy middleware                                                                   | Existing + hardened       |
|  12 | Typed API/RPC                   | validated endpoint definitions, typed RPC client, structured errors                                                               | Implemented               |
|  13 | Security defaults               | Existing CSP/CSRF/cookies/CORS/body guards plus WRN security metadata                                                             | Existing + hardened       |
|  14 | DevToolbar                      | Runtime diagnostic bridge and existing accessibility/performance/SEO/security rules                                               | Existing + hardened       |
|  15 | Optimization reports            | `dist/build-report.json`, CLI analyzer, route/assets/budget measurements                                                          | Implemented               |
|  16 | Error messages                  | Stable WRN codes, positions, code frames, hints                                                                                   | Implemented               |
|  17 | Language server/editor          | VS Code diagnostics/completion/grammar/snippets aligned to 0.3 syntax                                                             | Existing + hardened       |
|  18 | Schemas/validation              | Existing shared form/API validation retained; endpoint schema contract added                                                      | Existing + hardened       |
|  19 | Authentication primitives       | Existing auth/session/OAuth/passkey-related packages retained; security metadata seam                                             | Existing + hardened       |
|  20 | Multi-tenancy                   | tenant context, resolver/middleware, subdomain/domain/path runtime config                                                         | Implemented               |
|  21 | Jobs/cron/workflows             | priority, concurrency, idempotency, cancellation, job/workflow/cron helpers                                                       | Implemented               |
|  22 | Realtime                        | Existing rooms/pub-sub/Redis bridge retained with shared runtime                                                                  | Existing + hardened       |
|  23 | Plugin system                   | deterministic lifecycle, AST/code transforms, diagnostics, server/build hooks                                                     | Implemented               |
|  24 | Infrastructure adapters         | portable fetch handler and existing Bun/Node seams; adapter config/reporting                                                      | Foundation / experimental |
|  25 | Build caching/monorepo          | Existing compile cache and targeted HMR retained; build cache config seam                                                         | Existing + hardened       |
|  26 | Compatibility/migrations        | reversible 0.3 migration, source backup/report, `doctor`, unique versions                                                         | Implemented               |
|  27 | Testing                         | new syntax/core/compiler/router/queue/SSR/update/editor regressions                                                               | Implemented               |
|  28 | Performance budgets             | configurable route JS/CSS, HTML, image, hydration, and SSR budgets                                                                | Implemented               |
|  29 | Observability                   | tracer/span APIs, request middleware, Server-Timing, console exporter                                                             | Implemented               |
|  30 | Component architecture          | Existing `@wrnexus/ui` inventory retained; syntax metadata supports typed tooling                                                 | Existing + hardened       |
|  31 | Design tokens                   | Existing `--wire-*` system and theme resolution retained                                                                          | Existing + hardened       |
|  32 | Accessibility                   | compile-time missing-alt diagnostic plus existing DevToolbar scanning                                                             | Implemented               |
|  33 | Motion/transitions              | Existing CSR/lifecycle foundation retained; strategy can be plugin/runtime extended                                               | Foundation / experimental |
|  34 | Documentation                   | language, architecture, upgrade, implementation, test checklist docs                                                              | Implemented               |
|  35 | AI-friendly framework           | machine-readable spec/AST/diagnostics/build report and existing AI package                                                        | Implemented               |
|  36 | Feature flags/experimental APIs | async context-aware feature flags and typed config gates                                                                          | Implemented               |
|  37 | Public API boundaries           | syntax/compiler separation and explicit package exports                                                                           | Implemented               |
|  38 | Configuration                   | typed validation, source explanation, profile/env visibility                                                                      | Implemented               |
|  39 | Gateway                         | existing host routing/auth/WebSocket/security gateway preserved; internal contracts unchanged                                     | Existing + hardened       |
|  40 | Focused roadmap/release gates   | 0.3 stability levels, verification script, audit and test matrix                                                                  | Implemented               |

## Important release distinction

This matrix records code present in the 0.3 source tree. “Foundation / experimental”
does not mean absent; it means the API or adapter seam is implemented but should not
be advertised as provider-complete until the relevant deployment, animation, cache,
or server-component adapters receive real production tests.

## Backward-compatibility gates

1. Existing compiler imports continue through re-exports.
2. Existing `.wrn` members and directives remain accepted.
3. New runtime behavior is disabled unless syntax/config opts in.
4. Source migration is conservative, backed up, idempotent, and reported.
5. Existing route syntax retains matching precedence.
6. Existing dev and production request runtimes remain shared.
7. Every bug fix receives a regression test or static verification assertion.
