refactor(bus): migrate BusEvent to Effect Schema (#24040)

packages/opencode/src/session/compaction.ts

@@ -13,7 +13,7 @@ import { Plugin } from "@/plugin"
 import { Config } from "@/config"
 import { NotFoundError } from "@/storage"
 import { ModelID, ProviderID } from "@/provider/schema"
-import { Effect, Layer, Context } from "effect"
+import { Effect, Layer, Context, Schema } from "effect"
 import { InstanceState } from "@/effect"
 import { isOverflow as overflow, usable } from "./overflow"
 import { makeRuntime } from "@/effect/run-service"
@@ -24,8 +24,8 @@ const log = Log.create({ service: "session.compaction" })
 export const Event = {
   Compacted: BusEvent.define(
     "session.compacted",
-    z.object({
-      sessionID: SessionID.zod,
+    Schema.Struct({
+      sessionID: SessionID,
     }),
   ),
 }

packages/opencode/src/session/message-v2.ts

@@ -617,12 +617,12 @@ export const Event = {
   }),
   PartDelta: BusEvent.define(
     "message.part.delta",
-    z.object({
-      sessionID: SessionID.zod,
-      messageID: MessageID.zod,
-      partID: PartID.zod,
-      field: z.string(),
-      delta: z.string(),
+    Schema.Struct({
+      sessionID: SessionID,
+      messageID: MessageID,
+      partID: PartID,
+      field: Schema.String,
+      delta: Schema.String,
     }),
   ),
   PartRemoved: SyncEvent.define({

packages/opencode/src/session/session.ts

@@ -273,17 +273,18 @@ export const Event = {
   }),
   Diff: BusEvent.define(
     "session.diff",
-    z.object({
-      sessionID: SessionID.zod,
-      diff: Snapshot.FileDiff.zod.array(),
+    Schema.Struct({
+      sessionID: SessionID,
+      diff: Schema.Array(Snapshot.FileDiff),
     }),
   ),
   Error: BusEvent.define(
     "session.error",
-    z.object({
-      sessionID: SessionID.zod.optional(),
-      // z.lazy defers access to break circular dep: session → message-v2 → provider → plugin → session
-      error: z.lazy(() => (MessageV2.Assistant.zod as unknown as z.ZodObject<any>).shape.error),
+    Schema.Struct({
+      sessionID: Schema.optional(SessionID),
+      // Reuses MessageV2.Assistant.fields.error (already Schema.optional) so
+      // the derived zod keeps the same discriminated-union shape on the bus.
+      error: MessageV2.Assistant.fields.error,
     }),
   ),
 }

packages/opencode/src/session/status.ts

@@ -28,16 +28,16 @@ export type Info = Schema.Schema.Type<typeof Info>
 export const Event = {
   Status: BusEvent.define(
     "session.status",
-    z.object({
-      sessionID: SessionID.zod,
-      status: Info.zod,
+    Schema.Struct({
+      sessionID: SessionID,
+      status: Info,
     }),
   ),
   // deprecated
   Idle: BusEvent.define(
     "session.idle",
-    z.object({
-      sessionID: SessionID.zod,
+    Schema.Struct({
+      sessionID: SessionID,
     }),
   ),
 }

packages/opencode/src/session/todo.ts

@@ -22,9 +22,9 @@ export type Info = Schema.Schema.Type<typeof Info>
 export const Event = {
   Updated: BusEvent.define(
     "todo.updated",
-    z.object({
-      sessionID: SessionID.zod,
-      todos: z.array(Info.zod),
+    Schema.Struct({
+      sessionID: SessionID,
+      todos: Schema.Array(Info),
     }),
   ),
 }