7 files changed, 42 insertions, 21 deletions
diff --git a/src/bun.js/builtins/cpp/ReadableStreamBuiltins.cpp b/src/bun.js/builtins/cpp/ReadableStreamBuiltins.cpp
index cd14a15ea..86d40d4e8 100644
--- a/src/bun.js/builtins/cpp/ReadableStreamBuiltins.cpp
+++ b/src/bun.js/builtins/cpp/ReadableStreamBuiltins.cpp
@@ -567,15 +567,12 @@ const char* const s_readableStreamLockedCode =
 const JSC::ConstructAbility s_readableStreamValuesCodeConstructAbility = JSC::ConstructAbility::CannotConstruct;
 const JSC::ConstructorKind s_readableStreamValuesCodeConstructorKind = JSC::ConstructorKind::None;
 const JSC::ImplementationVisibility s_readableStreamValuesCodeImplementationVisibility = JSC::ImplementationVisibility::Public;
-const int s_readableStreamValuesCodeLength = 249;
+const int s_readableStreamValuesCodeLength = 191;
 static const JSC::Intrinsic s_readableStreamValuesCodeIntrinsic = JSC::NoIntrinsic;
 const char* const s_readableStreamValuesCode =
     "(function (options) {\n" \
     "    \"use strict\";\n" \
-    "    var prototype = this?.constructor?.prototype;\n" \
-    "    if (!prototype) {\n" \
-    "        return @undefined;\n" \
-    "    }\n" \
+    "    var prototype = @ReadableStream.prototype;\n" \
     "    @readableStreamDefineLazyIterators(prototype);\n" \
     "    return prototype.values.@call(this, options);\n" \
     "})\n" \
@@ -584,15 +581,12 @@ const char* const s_readableStreamValuesCode =
 const JSC::ConstructAbility s_readableStreamLazyAsyncIteratorCodeConstructAbility = JSC::ConstructAbility::CannotConstruct;
 const JSC::ConstructorKind s_readableStreamLazyAsyncIteratorCodeConstructorKind = JSC::ConstructorKind::None;
 const JSC::ImplementationVisibility s_readableStreamLazyAsyncIteratorCodeImplementationVisibility = JSC::ImplementationVisibility::Private;
-const int s_readableStreamLazyAsyncIteratorCodeLength = 259;
+const int s_readableStreamLazyAsyncIteratorCodeLength = 201;
 static const JSC::Intrinsic s_readableStreamLazyAsyncIteratorCodeIntrinsic = JSC::NoIntrinsic;
 const char* const s_readableStreamLazyAsyncIteratorCode =
     "(function () {\n" \
     "    \"use strict\";\n" \
-    "    var prototype = this?.constructor?.prototype;\n" \
-    "    if (!prototype) {\n" \
-    "        return @undefined;\n" \
-    "    }\n" \
+    "    var prototype = @ReadableStream.prototype;\n" \
     "    @readableStreamDefineLazyIterators(prototype);\n" \
     "    return prototype[globalThis.Symbol.asyncIterator].@call(this);\n" \
     "})\n" \
diff --git a/src/bun.js/builtins/cpp/ReadableStreamInternalsBuiltins.cpp b/src/bun.js/builtins/cpp/ReadableStreamInternalsBuiltins.cpp
index a2b13e770..4b65667cf 100644
--- a/src/bun.js/builtins/cpp/ReadableStreamInternalsBuiltins.cpp
+++ b/src/bun.js/builtins/cpp/ReadableStreamInternalsBuiltins.cpp
@@ -2575,7 +2575,7 @@ const char* const s_readableStreamInternalsReadableStreamToArrayDirectCode =
 const JSC::ConstructAbility s_readableStreamInternalsReadableStreamDefineLazyIteratorsCodeConstructAbility = JSC::ConstructAbility::CannotConstruct;
 const JSC::ConstructorKind s_readableStreamInternalsReadableStreamDefineLazyIteratorsCodeConstructorKind = JSC::ConstructorKind::None;
 const JSC::ImplementationVisibility s_readableStreamInternalsReadableStreamDefineLazyIteratorsCodeImplementationVisibility = JSC::ImplementationVisibility::Public;
-const int s_readableStreamInternalsReadableStreamDefineLazyIteratorsCodeLength = 1651;
+const int s_readableStreamInternalsReadableStreamDefineLazyIteratorsCodeLength = 1650;
 static const JSC::Intrinsic s_readableStreamInternalsReadableStreamDefineLazyIteratorsCodeIntrinsic = JSC::NoIntrinsic;
 const char* const s_readableStreamInternalsReadableStreamDefineLazyIteratorsCode =
     "(function (prototype) {\n" \
@@ -2618,7 +2618,6 @@ const char* const s_readableStreamInternalsReadableStreamDefineLazyIteratorsCode
     "          }\n" \
     "          }\n" \
     "    };\n" \
-    "\n" \
     "    var createAsyncIterator = function asyncIterator() {\n" \
     "        return ReadableStreamAsyncIterator(this, false);\n" \
     "    };\n" \
diff --git a/src/bun.js/builtins/js/ReadableStream.js b/src/bun.js/builtins/js/ReadableStream.js
index 8020b024d..fb4327ec8 100644
--- a/src/bun.js/builtins/js/ReadableStream.js
+++ b/src/bun.js/builtins/js/ReadableStream.js
@@ -446,10 +446,7 @@ function locked()
 
 function values(options) {
     "use strict";
-    var prototype = this?.constructor?.prototype;
-    if (!prototype) {
-        return @undefined;
-    }
+    var prototype = @ReadableStream.prototype;
     @readableStreamDefineLazyIterators(prototype);
     return prototype.values.@call(this, options);
 }
@@ -457,10 +454,7 @@ function values(options) {
 @linkTimeConstant
 function lazyAsyncIterator() {
     "use strict";
-    var prototype = this?.constructor?.prototype;
-    if (!prototype) {
-        return @undefined;
-    }
+    var prototype = @ReadableStream.prototype;
     @readableStreamDefineLazyIterators(prototype);
     return prototype[globalThis.Symbol.asyncIterator].@call(this);
 }
 \ No newline at end of file
diff --git a/src/bun.js/builtins/js/ReadableStreamInternals.js b/src/bun.js/builtins/js/ReadableStreamInternals.js
index ca1edaee8..c6115a456 100644
--- a/src/bun.js/builtins/js/ReadableStreamInternals.js
+++ b/src/bun.js/builtins/js/ReadableStreamInternals.js
@@ -2154,7 +2154,6 @@ function readableStreamDefineLazyIterators(prototype) {
           }
           }
     };
-
     var createAsyncIterator = function asyncIterator() {
         return ReadableStreamAsyncIterator(this, false);
     };
diff --git a/test/bun.js/bunExe.ts b/test/bun.js/bunExe.ts
new file mode 100644
index 000000000..2f1a89cd2
--- /dev/null
+++ b/test/bun.js/bunExe.ts
@@ -0,0 +1,7 @@
+export function bunExe() {
+  if (Bun.version.includes("debug")) {
+    return "bun-debug";
+  }
+
+  return "bun";
+}
diff --git a/test/bun.js/spawn-streaming-stdout-repro.js b/test/bun.js/spawn-streaming-stdout-repro.js
new file mode 100644
index 000000000..7279574bf
--- /dev/null
+++ b/test/bun.js/spawn-streaming-stdout-repro.js
@@ -0,0 +1,3 @@
+setInterval(() => {
+  console.log("Wrote to stdout");
+}, 20);
diff --git a/test/bun.js/spawn-streaming-stdout.test.ts b/test/bun.js/spawn-streaming-stdout.test.ts
new file mode 100644
index 000000000..88c028db3
--- /dev/null
+++ b/test/bun.js/spawn-streaming-stdout.test.ts
@@ -0,0 +1,25 @@
+import { it, test, expect } from "bun:test";
+import { spawn } from "bun";
+import { bunExe } from "./bunExe";
+
+test("spawn can read from stdout multiple chunks", async () => {
+  const proc = spawn({
+    cmd: [bunExe(), import.meta.dir + "/spawn-streaming-stdout-repro.js"],
+    stdout: "pipe",
+    env: {
+      BUN_DEBUG_QUIET_LOGS: 1,
+    },
+  });
+
+  var counter = 0;
+  for await (var chunk of proc.stdout) {
+    expect(new TextDecoder().decode(chunk)).toBe("Wrote to stdout\n");
+    counter++;
+
+    if (counter > 3) break;
+  }
+
+  expect(counter).toBe(4);
+  proc.kill();
+  await proc.exited;
+});