fix(child_process): map node `--no-warnings` flag to `--quiet` (#26288)

Closes https://github.com/denoland/deno/issues/25899

3 files changed, 24 insertions, 2 deletions

diff --git a/ext/node/polyfills/child_process.ts b/ext/node/polyfills/child_process.ts
index c37dfc410..eda718ff3 100644
--- a/ext/node/polyfills/child_process.ts
+++ b/ext/node/polyfills/child_process.ts
@@ -132,6 +132,8 @@ export function fork(
           rm = 2;
         }
         execArgv.splice(index, rm);
+      } else if (flag.startsWith("--no-warnings")) {
+        execArgv[index] = "--quiet";
       } else {
         index++;
       }
diff --git a/ext/node/polyfills/internal/child_process.ts b/ext/node/polyfills/internal/child_process.ts
index 6f209b719..65d825fd2 100644
--- a/ext/node/polyfills/internal/child_process.ts
+++ b/ext/node/polyfills/internal/child_process.ts
@@ -1191,8 +1191,12 @@ function toDenoArgs(args: string[]): string[] {
     }
 
     if (flagInfo === undefined) {
-      // Not a known flag that expects a value. Just copy it to the output.
-      denoArgs.push(arg);
+      if (arg === "--no-warnings") {
+        denoArgs.push("--quiet");
+      } else {
+        // Not a known flag that expects a value. Just copy it to the output.
+        denoArgs.push(arg);
+      }
       continue;
     }
 
diff --git a/tests/unit_node/child_process_test.ts b/tests/unit_node/child_process_test.ts
index f776fa4ac..0ea3c46cf 100644
--- a/tests/unit_node/child_process_test.ts
+++ b/tests/unit_node/child_process_test.ts
@@ -1045,3 +1045,19 @@ Deno.test(async function sendAfterClosedThrows() {
 
   await timeout.promise;
 });
+
+Deno.test(async function noWarningsFlag() {
+  const code = ``;
+  const file = await Deno.makeTempFile();
+  await Deno.writeTextFile(file, code);
+  const timeout = withTimeout<void>();
+  const child = CP.fork(file, [], {
+    execArgv: ["--no-warnings"],
+    stdio: ["inherit", "inherit", "inherit", "ipc"],
+  });
+  child.on("close", () => {
+    timeout.resolve();
+  });
+
+  await timeout.promise;
+});