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packages/bun-types/bun.d.ts

@@ -3276,8 +3276,12 @@ declare module "bun" {
       : Opts["stdin"] extends "pipe"
       ? FileSink
       : ReadableStream;
-    stdout?: Opts["stdout"] extends number ? number : ReadableStream;
-    stderr?: Opts["stderr"] extends number ? number : ReadableStream;
+    stdout?: Opts["stdout"] extends number
+      ? number
+      : ReadableStream<Uint8Array>;
+    stderr?: Opts["stderr"] extends number
+      ? number
+      : ReadableStream<Uint8Array>;
   };
 
   /**

packages/bun-types/stream.d.ts

@@ -46,7 +46,7 @@ declare module "stream" {
       encoding?: BufferEncoding | undefined;
       read?(this: Readable, size: number): void;
     }
-    class Readable<R = any> extends Stream implements ReadableStream {
+    class Readable<R = any> extends Stream implements ReadableStream<R> {
       // TODO: improve type later
       values: any;
 

packages/bun-types/tests/spawn.test-d.ts

@@ -1,3 +1,5 @@
+import { expectType } from "tsd";
+
 Bun.spawn(["echo", "hello"]);
 {
   const proc = Bun.spawn(["echo", "hello"], {
@@ -65,6 +67,11 @@ Bun.spawn(["echo", "hello"]);
   proc.unref();
 }
 
+// Bun.spawn()'s stdout & stderr are wrong when ReadableStream.getReader().read(
+
 {
+  const proc = Bun.spawn([]);
+  const arg = await proc.stdout!.getReader().read();
+  expectType<Uint8Array>(arg.value!);
 }
 export {};

test/regression/issue/02499-repro.ts

@@ -19,3 +19,5 @@ console.log(
     }
   }
 })();
+
+export {};