Two-stage codegen: React + Vue + Svelte from one schema

Stage 1 (framework-agnostic):
  types.ts           — OpenAPI interfaces
  contexts/<name>.ts — fetchXxxContext(params) using mizanFetch
  mutations/<name>.ts — callXxx(args) using mizanCall
  functions/<name>.ts — callXxx(args) using mizanCall
  index.ts           — re-exports

Stage 2 (per framework):
  react.tsx  — hooks + context providers + SSR hydration
  vue.ts     — composables with provide/inject + ref/computed
  svelte.ts  — writable/derived store factories

New packages:
  mizan-runtime — the kernel (~200 lines, zero framework deps)
    configure(), initSession(), registerContext(), invalidate(),
    mizanFetch(), mizanCall(), MizanError
  mizan-vue     — Vue adapter (package.json, codegen template)
  mizan-svelte  — Svelte adapter (package.json, codegen template)

CLI: mizan-generate --target react,vue,svelte
Config: target: 'react' (default) in django.config.mjs

Verified: codegen produces 33 functions across 2 contexts,
14 plain functions, 0 mutations, generating all three Stage 2
outputs from one schema fetch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/mizan-django/generate/generator/lib/adapters/vue.mjs

@@ -0,0 +1,105 @@
+/**
+ * Vue Stage 2 — Generates composables from Stage 1 output.
+ */
+
+function pascalCase(str) {
+    return str.split(/[.\-_]/).map(p => p.charAt(0).toUpperCase() + p.slice(1)).join('')
+}
+
+export function generateVueAdapter(schema) {
+    const functions = schema['x-mizan-functions'] || []
+    const contextGroups = schema['x-mizan-contexts'] || {}
+    const mutations = functions.filter(fn => !fn.isContext && !fn.isForm && fn.affects)
+    const plainFns = functions.filter(fn => !fn.isContext && !fn.isForm && !fn.affects)
+
+    const lines = [
+        '// AUTO-GENERATED by mizan — do not edit',
+        '',
+        "import { ref, computed, watch, onMounted, onUnmounted, provide, inject, type Ref, type ComputedRef, type InjectionKey } from 'vue'",
+        "import { registerContext } from '@mizan/runtime'",
+        '',
+    ]
+
+    // Stage 1 imports
+    const stage1Imports = []
+    for (const [ctxName] of Object.entries(contextGroups)) {
+        const p = pascalCase(ctxName)
+        stage1Imports.push(`fetch${p}Context`, `type ${p}ContextData`, `type ${p}ContextParams`)
+    }
+    for (const fn of [...mutations, ...plainFns]) {
+        stage1Imports.push(`call${pascalCase(fn.camelName)}`)
+    }
+    if (stage1Imports.length > 0) {
+        lines.push(`import { ${stage1Imports.join(', ')} } from '../index'`)
+        lines.push('')
+    }
+
+    // ── Context composables ─────────────────────────────────────────────
+
+    for (const [ctxName, ctxMeta] of Object.entries(contextGroups)) {
+        const p = pascalCase(ctxName)
+        const ctxFunctions = functions.filter(fn => fn.isContext === ctxName)
+        const paramEntries = Object.entries(ctxMeta.params || {})
+
+        lines.push(`// ${p} context`)
+        lines.push(`const ${p}Key: InjectionKey<{ data: Ref<${p}ContextData | null>, loading: Ref<boolean> }> = Symbol('${ctxName}')`)
+        lines.push('')
+
+        // Provider composable
+        if (paramEntries.length > 0) {
+            lines.push(`export function provide${p}Context(params: { ${paramEntries.map(([k, v]) => `${k}: ${v.type === 'integer' || v.type === 'number' ? 'number' : 'string'}`).join(', ')} }) {`)
+        } else {
+            lines.push(`export function provide${p}Context() {`)
+        }
+        lines.push(`    const data = ref<${p}ContextData | null>(null)`)
+        lines.push(`    const loading = ref(true)`)
+        lines.push('')
+        lines.push(`    const refetch = async () => {`)
+        lines.push(`        loading.value = true`)
+        lines.push(`        try {`)
+        if (paramEntries.length > 0) {
+            lines.push(`            data.value = await fetch${p}Context(params as any)`)
+        } else {
+            lines.push(`            data.value = await fetch${p}Context({} as any)`)
+        }
+        lines.push(`        } catch (e) { console.error('[mizan] ${ctxName} fetch failed:', e) }`)
+        lines.push(`        loading.value = false`)
+        lines.push(`    }`)
+        lines.push('')
+        lines.push(`    let unregister: (() => void) | null = null`)
+        lines.push(`    onMounted(() => {`)
+        lines.push(`        refetch()`)
+        if (paramEntries.length > 0) {
+            lines.push(`        unregister = registerContext('${ctxName}', params, refetch)`)
+        } else {
+            lines.push(`        unregister = registerContext('${ctxName}', {}, refetch)`)
+        }
+        lines.push(`    })`)
+        lines.push(`    onUnmounted(() => { unregister?.() })`)
+        lines.push('')
+        lines.push(`    provide(${p}Key, { data, loading })`)
+        lines.push('}')
+        lines.push('')
+
+        // Consumer composables
+        for (const fn of ctxFunctions) {
+            const hookPascal = pascalCase(fn.camelName)
+            lines.push(`export function use${hookPascal}(): ComputedRef<${fn.outputType} | null> {`)
+            lines.push(`    const ctx = inject(${p}Key)`)
+            lines.push(`    if (!ctx) throw new Error('use${hookPascal} requires provide${p}Context in a parent')`)
+            lines.push(`    return computed(() => ctx.data.value?.${fn.name} ?? null)`)
+            lines.push('}')
+            lines.push('')
+        }
+    }
+
+    // ── Mutation composables ────────────────────────────────────────────
+
+    for (const fn of [...mutations, ...plainFns]) {
+        const p = pascalCase(fn.camelName)
+        lines.push(`export const use${p} = call${p}`)
+        lines.push('')
+    }
+
+    return lines.join('\n')
+}