Ryth Azhur
43bcf3f26f
The Mizan codegen substrate moves off JavaScript template-literal emission
onto a compiled Rust binary that consumes the same OpenAPI + x-mizan-* IR
the JS substrate consumed. Three structural wins fall out of one move:
1. Moat closes. The codegen logic (how `affects` becomes auto-invalidation,
how named contexts collapse onto bundled fetches, how the registry-to-
Provider mapping is shaped) ships compiled instead of as source bytes
in every consumer's node_modules.
2. Pattern F (lines.push append-walls) becomes structurally unauthorable.
The emit substrate is askama templates in templates/<target>/*.j2 —
actual target-language files with {{ ... }} substitution markers,
syntax-highlighted natively, type-checked against the render context
structs at compile time. The Rust emit modules build typed render
contexts and call .render(); no string-builder surface exists.
3. OpenAPI `default`-bearing fields now emit as non-optional in TS / Python
/ Rust — the server always populates them, so consumer code reads them
without nullable checks. Surfaced by Blazr's typecheck on regeneration.
Layout:
frontends/mizan-rust/ — Rust port of @mizan/base; #[cfg(feature="pyo3")]
exposes PyMizanClient for the Python target.
protocol/mizan-codegen/ — codegen binary source + askama templates.
protocol/mizan-generate/ — npm-package shim. bin/launcher.mjs dispatches
to the platform-appropriate prebuilt binary.
Old generator/ JS tree deleted.
tests/rust/ — wire-parity drivers. drive_kernel exercises
raw client.call() / fetch_context(); drive_emitted
exercises the typed crate the codegen emits.
tests/afi/afi_codegen_app.py — codegen entrypoint module (imports + registers).
backends/mizan-fastapi/.../schema.py — adds outputNullable so the Rust
codegen can wrap T | None responses in Option<T>.
Verification:
- 20 mizan-codegen tests green (IR deserialization, byte-equivalent
parity vs JS baseline for stage1/rust/python/react/vue/svelte,
structural test for channels).
- tests/rust/run_wire_parity.py — 12/12 probes green via the Rust binary
driving the FastAPI fixture end-to-end.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
27 lines
1.0 KiB
Django/Jinja
27 lines
1.0 KiB
Django/Jinja
'use client'
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// AUTO-GENERATED by mizan — do not edit
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import { useChannel, type ChannelSubscription } from 'mizan/channels'
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{% if !type_imports.is_empty() -%}
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import type { {{ type_imports|join(", ") }} } from './channels'
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{% endif -%}
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// ── Channel Hooks ─────────────────────────────────────────────────────────
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{% for ch in channels -%}
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/**
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* Hook for the {{ ch.name }} channel.
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*/
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{% if ch.has_params -%}
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export function use{{ ch.pascal_name }}Channel(params: {{ ch.params_type_or_record }}): ChannelSubscription<{{ ch.params_type_or_record }}, {{ ch.django_msg_type_or_never }}, {{ ch.react_msg_type_or_never }}> {
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return useChannel('{{ ch.name }}', params)
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}
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{% else -%}
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export function use{{ ch.pascal_name }}Channel(): ChannelSubscription<Record<string, never>, {{ ch.django_msg_type_or_never }}, {{ ch.react_msg_type_or_never }}> {
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return useChannel('{{ ch.name }}', {})
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}
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{% endif %}
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{% endfor -%}
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