diff --git a/packages/bun-types/bun.d.ts b/packages/bun-types/bun.d.ts
index e6ee3dd8f8..ecfda0192f 100644
--- a/packages/bun-types/bun.d.ts
+++ b/packages/bun-types/bun.d.ts
@@ -6393,11 +6393,7 @@ declare module "bun" {
       | Response
       | Request;
 
-    interface OptionsObject<
-      In extends Writable = Writable,
-      Out extends Readable = Readable,
-      Err extends Readable = Readable,
-    > {
+    interface OptionsObject<In extends Writable, Out extends Readable, Err extends Readable> {
       /**
        * The current working directory of the process
        *
@@ -6624,22 +6620,6 @@ declare module "bun" {
       maxBuffer?: number;
     }
 
-    type OptionsToSubprocess<Opts extends OptionsObject> =
-      Opts extends OptionsObject<infer In, infer Out, infer Err>
-        ? Subprocess<
-            // "Writable extends In" means "if In === Writable",
-            // aka if true that means the user didn't specify anything
-            Writable extends In ? "ignore" : In,
-            Readable extends Out ? "pipe" : Out,
-            Readable extends Err ? "inherit" : Err
-          >
-        : Subprocess<Writable, Readable, Readable>;
-
-    type OptionsToSyncSubprocess<Opts extends OptionsObject> =
-      Opts extends OptionsObject<any, infer Out, infer Err>
-        ? SyncSubprocess<Readable extends Out ? "pipe" : Out, Readable extends Err ? "pipe" : Err>
-        : SyncSubprocess<Readable, Readable>;
-
     type ReadableIO = ReadableStream<Uint8Array> | number | undefined;
 
     type ReadableToIO<X extends Readable> = X extends "pipe" | undefined
@@ -6746,9 +6726,9 @@ declare module "bun" {
    * - {@link NullSubprocess} (ignore, ignore, ignore)
    */
   interface Subprocess<
-    In extends SpawnOptions.Writable = SpawnOptions.Writable,
-    Out extends SpawnOptions.Readable = SpawnOptions.Readable,
-    Err extends SpawnOptions.Readable = SpawnOptions.Readable,
+    In extends SpawnOptions.Writable,
+    Out extends SpawnOptions.Readable,
+    Err extends SpawnOptions.Readable,
   > extends AsyncDisposable {
     readonly stdin: SpawnOptions.WritableToIO<In>;
     readonly stdout: SpawnOptions.ReadableToIO<Out>;
@@ -6853,10 +6833,7 @@ declare module "bun" {
    * - {@link ReadableSyncSubprocess} (pipe, pipe)
    * - {@link NullSyncSubprocess} (ignore, ignore)
    */
-  interface SyncSubprocess<
-    Out extends SpawnOptions.Readable = SpawnOptions.Readable,
-    Err extends SpawnOptions.Readable = SpawnOptions.Readable,
-  > {
+  interface SyncSubprocess<Out extends SpawnOptions.Readable, Err extends SpawnOptions.Readable> {
     stdout: SpawnOptions.ReadableToSyncIO<Out>;
     stderr: SpawnOptions.ReadableToSyncIO<Err>;
     exitCode: number;
@@ -6888,8 +6865,12 @@ declare module "bun" {
    *
    * Internally, this uses [posix_spawn(2)](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/posix_spawn.2.html)
    */
-  function spawn<Opts extends SpawnOptions.OptionsObject>(
-    options: Opts & {
+  function spawn<
+    const In extends SpawnOptions.Writable = "ignore",
+    const Out extends SpawnOptions.Readable = "pipe",
+    const Err extends SpawnOptions.Readable = "inherit",
+  >(
+    options: SpawnOptions.OptionsObject<In, Out, Err> & {
       /**
        * The command to run
        *
@@ -6906,7 +6887,7 @@ declare module "bun" {
        */
       cmd: string[]; // to support dynamically constructed commands
     },
-  ): SpawnOptions.OptionsToSubprocess<Opts>;
+  ): Subprocess<In, Out, Err>;
 
   /**
    * Spawn a new process
@@ -6919,7 +6900,11 @@ declare module "bun" {
    *
    * Internally, this uses [posix_spawn(2)](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/posix_spawn.2.html)
    */
-  function spawn<Opts extends SpawnOptions.OptionsObject>(
+  function spawn<
+    const In extends SpawnOptions.Writable = "ignore",
+    const Out extends SpawnOptions.Readable = "pipe",
+    const Err extends SpawnOptions.Readable = "inherit",
+  >(
     /**
      * The command to run
      *
@@ -6935,8 +6920,8 @@ declare module "bun" {
      * ```
      */
     cmds: string[],
-    options?: Opts,
-  ): SpawnOptions.OptionsToSubprocess<Opts>;
+    options?: SpawnOptions.OptionsObject<In, Out, Err>,
+  ): Subprocess<In, Out, Err>;
 
   /**
    * Spawn a new process
@@ -6952,8 +6937,11 @@ declare module "bun" {
    *
    * Internally, this uses [posix_spawn(2)](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/posix_spawn.2.html)
    */
-  function spawnSync<Opts extends SpawnOptions.OptionsObject>(
-    options: Opts & {
+  function spawnSync<
+    const Out extends SpawnOptions.Readable = "pipe",
+    const Err extends SpawnOptions.Readable = "inherit",
+  >(
+    options: SpawnOptions.OptionsObject<"ignore", Out, Err> & {
       /**
        * The command to run
        *
@@ -6972,7 +6960,7 @@ declare module "bun" {
 
       onExit?: never;
     },
-  ): SpawnOptions.OptionsToSyncSubprocess<Opts>;
+  ): SyncSubprocess<Out, Err>;
 
   /**
    * Synchronously spawn a new process
@@ -6984,7 +6972,10 @@ declare module "bun" {
    *
    * Internally, this uses [posix_spawn(2)](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/posix_spawn.2.html)
    */
-  function spawnSync<Opts extends SpawnOptions.OptionsObject>(
+  function spawnSync<
+    const Out extends SpawnOptions.Readable = "pipe",
+    const Err extends SpawnOptions.Readable = "inherit",
+  >(
     /**
      * The command to run
      *
@@ -7000,8 +6991,8 @@ declare module "bun" {
      * ```
      */
     cmds: string[],
-    options?: Opts,
-  ): SpawnOptions.OptionsToSyncSubprocess<Opts>;
+    options?: SpawnOptions.OptionsObject<"ignore", Out, Err>,
+  ): SyncSubprocess<Out, Err>;
 
   /** Utility type for any process from {@link Bun.spawn()} with both stdout and stderr set to `"pipe"` */
   type ReadableSubprocess = Subprocess<any, "pipe", "pipe">;
diff --git a/packages/bun-types/shell.d.ts b/packages/bun-types/shell.d.ts
index 2f1170018a..5a91c7f4ab 100644
--- a/packages/bun-types/shell.d.ts
+++ b/packages/bun-types/shell.d.ts
@@ -6,7 +6,7 @@ declare module "bun" {
     | Array<ShellExpression>
     | string
     | { raw: string }
-    | Subprocess
+    | Subprocess<SpawnOptions.Writable, SpawnOptions.Readable, SpawnOptions.Readable>
     | SpawnOptions.Readable
     | SpawnOptions.Writable
     | ReadableStream;
diff --git a/test/integration/bun-types/bun-types.test.ts b/test/integration/bun-types/bun-types.test.ts
index e4a7358147..4564d0051b 100644
--- a/test/integration/bun-types/bun-types.test.ts
+++ b/test/integration/bun-types/bun-types.test.ts
@@ -73,7 +73,11 @@ beforeEach(async () => {
 
 afterAll(async () => {
   if (TEMP_DIR) {
-    await rm(TEMP_DIR, { recursive: true, force: true });
+    if (Bun.env.TYPES_INTEGRATION_TEST_KEEP_TEMP_DIR === "true") {
+      console.log(`Keeping temp dir ${TEMP_DIR} for debugging`);
+    } else {
+      await rm(TEMP_DIR, { recursive: true, force: true });
+    }
   }
 });
 
diff --git a/test/integration/bun-types/fixture/spawn.ts b/test/integration/bun-types/fixture/spawn.ts
index c2eac5bb92..0fc0fff81e 100644
--- a/test/integration/bun-types/fixture/spawn.ts
+++ b/test/integration/bun-types/fixture/spawn.ts
@@ -14,6 +14,30 @@ function depromise<T>(_promise: Promise<T>): T {
   return "asdf" as any as T;
 }
 
+{
+  // Test cases for https://github.com/oven-sh/bun/issues/17274
+
+  {
+    const proc = Bun.spawn(["cat"], {
+      stdin: "pipe",
+    });
+
+    proc.stdin.write("hello");
+  }
+
+  {
+    const proc = Bun.spawn(["cat"], {
+      stdin: "pipe",
+      onExit(proc, exitCode, signalCode, error) {
+        tsd.expectType(proc).is<Bun.Subprocess<"pipe", "pipe", "inherit">>();
+        console.log(`Process exited: ${exitCode}`);
+      },
+    });
+
+    proc.stdin.write("hello");
+  }
+}
+
 {
   const proc = Bun.spawn(["echo", "hello"], {
     cwd: "./path/to/subdir", // specify a working direcory
@@ -23,11 +47,11 @@ function depromise<T>(_promise: Promise<T>): T {
     },
   });
 
-  proc.pid; // process ID of subprocess
+  tsd.expectType(proc.pid).is<number>();
 
-  tsd.expectType<ReadableStream<Uint8Array>>(proc.stdout);
-  tsd.expectType<undefined>(proc.stderr);
-  tsd.expectType<undefined>(proc.stdin);
+  tsd.expectType(proc.stdout).is<ReadableStream<Uint8Array<ArrayBufferLike>>>();
+  tsd.expectType(proc.stderr).is<undefined>();
+  tsd.expectType(proc.stdin).is<undefined>();
 }
 
 {
@@ -115,14 +139,16 @@ function depromise<T>(_promise: Promise<T>): T {
   const proc = Bun.spawn(["echo", "hello"], {
     stdio: [null, null, null],
   });
-  tsd.expectType<undefined>(proc.stdin);
-  tsd.expectType<undefined>(proc.stdout);
-  tsd.expectType<undefined>(proc.stderr);
+
+  tsd.expectType(proc.stdin).is<undefined>();
+  tsd.expectType(proc.stdout).is<undefined>();
+  tsd.expectType(proc.stderr).is<undefined>();
 }
 {
   const proc = Bun.spawn(["echo", "hello"], {
     stdio: [new Request("1"), null, null],
   });
+
   tsd.expectType<number>(proc.stdin);
 }
 {
@@ -150,5 +176,4 @@ tsd.expectAssignable<NullSubprocess>(Bun.spawn([], { stdio: [null, null, null] }
 tsd.expectNotAssignable<ReadableSubprocess>(Bun.spawn([], {}));
 tsd.expectNotAssignable<PipedSubprocess>(Bun.spawn([], {}));
 
-tsd.expectAssignable<SyncSubprocess>(Bun.spawnSync([], {}));
-tsd.expectAssignable<SyncSubprocess>(Bun.spawnSync([], {}));
+tsd.expectAssignable<SyncSubprocess<Bun.SpawnOptions.Readable, Bun.SpawnOptions.Readable>>(Bun.spawnSync([], {}));