Advance M8-M11 parity workflows

web/protocol/worker-fault.ts

@@ -0,0 +1,21 @@
+import type { ErrorReport } from "./error";
+
+export type WorkerFaultSource = "engine" | "storage";
+
+export interface WorkerFault {
+  source: WorkerFaultSource;
+  error: ErrorReport;
+}
+
+export function createWorkerFault(source: WorkerFaultSource, message: string): WorkerFault {
+  return {
+    source,
+    error: {
+      code: "WORKER_TERMINATED",
+      severity: "error",
+      message,
+      recoverable: true,
+      cause: `${source}-worker-fault`,
+    },
+  };
+}