OpenTUI is here (#2685)

packages/opencode/src/util/rpc.ts

@@ -0,0 +1,42 @@
+export namespace Rpc {
+  type Definition = {
+    [method: string]: (input: any) => any
+  }
+
+  export function listen(rpc: Definition) {
+    onmessage = async (evt) => {
+      const parsed = JSON.parse(evt.data)
+      if (parsed.type === "rpc.request") {
+        const result = await rpc[parsed.method](parsed.input)
+        postMessage(JSON.stringify({ type: "rpc.result", result, id: parsed.id }))
+      }
+    }
+  }
+
+  export function client<T extends Definition>(target: {
+    postMessage: (data: string) => void | null
+    onmessage: ((this: Worker, ev: MessageEvent<any>) => any) | null
+  }) {
+    const pending = new Map<number, (result: any) => void>()
+    let id = 0
+    target.onmessage = async (evt) => {
+      const parsed = JSON.parse(evt.data)
+      if (parsed.type === "rpc.result") {
+        const resolve = pending.get(parsed.id)
+        if (resolve) {
+          resolve(parsed.result)
+          pending.delete(parsed.id)
+        }
+      }
+    }
+    return {
+      call<Method extends keyof T>(method: Method, input: Parameters<T[Method]>[0]): Promise<ReturnType<T[Method]>> {
+        const requestId = id++
+        return new Promise((resolve) => {
+          pending.set(requestId, resolve)
+          target.postMessage(JSON.stringify({ type: "rpc.request", method, input, id: requestId }))
+        })
+      },
+    }
+  }
+}