Implement main-thread Camino sessions and synchronous CRDT editing

src/execution-world/kernel.ts

@@ -9,10 +9,15 @@ import type {
 } from "../capability-model/types.js";
 import { type ExecutionPlan, ExecutionPlanError, hexDigest } from "./plan.js";
 import { portableValueSchema } from "../bindings/portable.js";
-function preparedInputPaths(type: ValueType, path: (string | null)[] = []): (string | null)[][] {
+type PreparedStep = string | null | { case: string; id: string };
+function preparedInputPaths(type: ValueType, path: PreparedStep[] = []): PreparedStep[][] {
   if (type.kind === "change") return [path];
   if (type.kind === "optional") return preparedInputPaths(type.value, path);
   if (type.kind === "list") return preparedInputPaths(type.value, [...path, null]);
+  if (type.kind === "variant")
+    return Object.entries(type.cases).flatMap(([label, entry]) =>
+      preparedInputPaths(entry.value, [...path, { case: label, id: entry.id }]),
+    );
   if (type.kind === "record")
     return Object.entries(type.fields).flatMap(([key, value]) => preparedInputPaths(value, [...path, key]));
   return [];
@@ -210,6 +215,7 @@ export function compileKernelProgram(plan: ExecutionPlan): unknown {
         package: binding.packageRevisionId,
         export: binding.exportId,
         ports,
+        ...(entry.preparation ? { preparation: entry.preparation } : {}),
         ...(check
           ? { acceptance: { export: check.id, ports: compilePorts(check, binding.acceptanceDependencies ?? []) } }
           : {}),
@@ -237,6 +243,7 @@ export function compileKernelProgram(plan: ExecutionPlan): unknown {
     revision: pkg.revisionId,
     exports: pkg.exports.map((entry) => ({
       id: entry.id,
+      ...(entry.preparation ? { preparation: entry.preparation } : {}),
       ...(entry.acceptanceExportId ? { acceptance: entry.acceptanceExportId } : {}),
       effect: entry.execution?.kind ?? "remote",
       targets: entry.execution && entry.execution.kind !== "remote" ? entry.execution.targets : [],

src/execution-world/plan.ts

@@ -142,6 +142,9 @@ export function resolvePlannedOperation(
 /** Bound argument/state codec subset. A parsed type alone does not mean a runtime implements it. */
 function checkValue(type: ValueType, path: string, allowChange = false): void {
   switch (type.kind) {
+    case "variant":
+      for (const [label, entry] of Object.entries(type.cases)) checkValue(entry.value, `${path}.${label}`, allowChange);
+      return;
     case "scalar":
     case "object-ref":
       return;