fix(core): fix encoding input for remote manager driver

packages/rivetkit/src/remote-manager-driver/mod.ts

@@ -15,6 +15,7 @@ import type {
 	ManagerDriver,
 } from "@/driver-helpers/mod";
 import type { Encoding, UniversalWebSocket } from "@/mod";
+import { uint8ArrayToBase64 } from "@/serde";
 import { combineUrlPath } from "@/utils";
 import { sendHttpRequestToActor } from "./actor-http-client";
 import {
@@ -140,7 +141,7 @@ export class RemoteManagerDriver implements ManagerDriver {
 			key: serializeActorKey(key),
 			runner_name_selector: this.#config.runnerName,
 			input: actorInput
-				? cbor.encode(actorInput).toString("base64")
+				? uint8ArrayToBase64(cbor.encode(actorInput))
 				: undefined,
 			crash_policy: "sleep",
 		});
@@ -175,7 +176,7 @@ export class RemoteManagerDriver implements ManagerDriver {
 			name,
 			runner_name_selector: this.#config.runnerName,
 			key: serializeActorKey(key),
-			input: input ? cbor.encode(input).toString("base64") : null,
+			input: input ? uint8ArrayToBase64(cbor.encode(input)) : undefined,
 			crash_policy: "sleep",
 		});
 		const actorId = result.actor.actor_id;

packages/rivetkit/src/serde.ts

@@ -5,6 +5,21 @@ import type { VersionedDataHandler } from "@/common/versioned-data";
 import type { Encoding } from "@/mod";
 import { jsonStringifyCompat } from "./actor/protocol/serde";
 
+export function uint8ArrayToBase64(uint8Array: Uint8Array): string {
+	// Check if Buffer is available (Node.js)
+	if (typeof Buffer !== "undefined") {
+		return Buffer.from(uint8Array).toString("base64");
+	}
+
+	// Browser environment - use btoa
+	let binary = "";
+	const len = uint8Array.byteLength;
+	for (let i = 0; i < len; i++) {
+		binary += String.fromCharCode(uint8Array[i]);
+	}
+	return btoa(binary);
+}
+
 export function encodingIsBinary(encoding: Encoding): boolean {
 	if (encoding === "json") {
 		return false;