[browser][MT] silence "keeping the worker alive for asynchronous operation"

src/mono/browser/runtime/loader/logging.ts

@@ -9,6 +9,7 @@ import { ENVIRONMENT_IS_WORKER, loaderHelpers } from "./globals";
 
 const methods = ["debug", "log", "trace", "warn", "info", "error"];
 const prefix = "MONO_WASM: ";
+const emscriptenNoise = "keeping the worker alive for asynchronous operation";
 let consoleWebSocket: WebSocket;
 let theConsoleApi: any;
 let originalConsoleMethods: any;
@@ -71,7 +72,7 @@ function proxyConsoleMethod(prefix: string, func: any, asJson: boolean) {
 
             if (typeof payload === "string") {
                 if (WasmEnableThreads) {
-                    if (ENVIRONMENT_IS_WORKER && payload.indexOf("keeping the worker alive for asynchronous operation") !== -1) {
+                    if (ENVIRONMENT_IS_WORKER && payload.indexOf(emscriptenNoise) !== -1) {
                         // muting emscripten noise
                         return;
                     }
@@ -101,6 +102,19 @@ function proxyConsoleMethod(prefix: string, func: any, asJson: boolean) {
     };
 }
 
+export function mute_worker_console(): void {
+    originalConsoleMethods = {
+        ...console
+    };
+    console.error = (...args: any[]) => {
+        const payload = args.length > 0 ? args[0] : "";
+        if (payload.indexOf(emscriptenNoise) !== -1) {
+            return;
+        }
+        originalConsoleMethods.error(...args);
+    };
+}
+
 export function setup_proxy_console(id: string, console: Console, origin: string): void {
     theConsoleApi = console as any;
     threadNamePrefix = id;

src/mono/browser/runtime/loader/worker.ts

@@ -1,13 +1,16 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+import WasmEnableThreads from "consts:wasmEnableThreads";
+
 import { MonoConfigInternal, WorkerToMainMessageType, monoMessageSymbol } from "../types/internal";
 import { MonoConfig } from "../types";
 import { deep_merge_config, normalizeConfig } from "./config";
 import { ENVIRONMENT_IS_WEB, loaderHelpers } from "./globals";
-import { mono_log_debug } from "./logging";
+import { mono_log_debug, mute_worker_console } from "./logging";
 
 export function setupPreloadChannelToMainThread() {
+    if (!WasmEnableThreads) return;
     const channel = new MessageChannel();
     const workerPort = channel.port1;
     const mainPort = channel.port2;
@@ -31,6 +34,7 @@ let workerMonoConfigReceived = false;
 
 // called when the main thread sends us the mono config
 function onMonoConfigReceived(config: MonoConfigInternal): void {
+    if (!WasmEnableThreads) return;
     if (workerMonoConfigReceived) {
         mono_log_debug("mono config already received");
         return;
@@ -45,5 +49,7 @@ function onMonoConfigReceived(config: MonoConfigInternal): void {
     if (ENVIRONMENT_IS_WEB && config.forwardConsoleLogsToWS && typeof globalThis.WebSocket != "undefined") {
         loaderHelpers.setup_proxy_console("worker-idle", console, globalThis.location.origin);
     }
+    else if (ENVIRONMENT_IS_WEB && !loaderHelpers.config.forwardConsoleLogsToWS) {
+        mute_worker_console();
+    }
 }
-

src/mono/browser/runtime/run.ts

@@ -75,8 +75,6 @@ export async function mono_run_main(main_assembly_name?: string, args?: string[]
     }
 }
 
-
-
 export function nativeExit(code: number) {
     if (WasmEnableThreads) {
         cancelThreads();