spawnSync shouldn't throw (#15561)

Co-authored-by: Meghan Denny <meghan@bun.sh>

src/bun.js/api/bun/subprocess.zig

@@ -1766,13 +1766,13 @@ pub const Subprocess = struct {
                     if (argv0 == null) {
                         var path_buf: bun.PathBuffer = undefined;
                         const resolved = Which.which(&path_buf, PATH, cwd, arg0.slice()) orelse {
-                            return globalThis.throwInvalidArguments("Executable not found in $PATH: \"{s}\"", .{arg0.slice()});
+                            return throwCommandNotFound(globalThis, arg0.slice());
                         };
                         argv0 = try allocator.dupeZ(u8, resolved);
                     } else {
                         var path_buf: bun.PathBuffer = undefined;
                         const resolved = Which.which(&path_buf, PATH, cwd, bun.sliceTo(argv0.?, 0)) orelse {
-                            return globalThis.throwInvalidArguments("Executable not found in $PATH: \"{s}\"", .{arg0.slice()});
+                            return throwCommandNotFound(globalThis, arg0.slice());
                         };
                         argv0 = try allocator.dupeZ(u8, resolved);
                     }
@@ -2314,6 +2314,15 @@ pub const Subprocess = struct {
         return sync_value;
     }
 
+    fn throwCommandNotFound(globalThis: *JSC.JSGlobalObject, command: []const u8) bun.JSError {
+        const message = bun.String.createFormat("Executable not found in $PATH: \"{s}\"", .{command}) catch bun.outOfMemory();
+        defer message.deref();
+        const err = message.toZigString().toErrorInstance(globalThis);
+        err.putZigString(globalThis, JSC.ZigString.static("code"), JSC.ZigString.init("ENOENT").toJS(globalThis));
+        err.putZigString(globalThis, JSC.ZigString.static("path"), JSC.ZigString.init(command).toJS(globalThis));
+        return globalThis.throwValue(err);
+    }
+
     const node_cluster_binding = @import("./../../node/node_cluster_binding.zig");
 
     pub fn handleIPCMessage(

src/bun.js/bindings/bindings.zig

@@ -4197,7 +4197,7 @@ pub const JSValue = enum(i64) {
         return cppFn("putRecord", .{ value, global, key, values_array, values_len });
     }
 
-    fn putZigString(value: JSValue, global: *JSGlobalObject, key: *const ZigString, result: JSC.JSValue) void {
+    pub fn putZigString(value: JSValue, global: *JSGlobalObject, key: *const ZigString, result: JSC.JSValue) void {
         @import("./headers.zig").JSC__JSValue__put(value, global, key, result);
     }
 

src/js/node/child_process.ts

@@ -558,20 +558,27 @@ function spawnSync(file, args, options) {
     }
   }
 
-  const {
-    stdout = null,
-    stderr = null,
-    success,
-    exitCode,
-    signalCode,
-  } = Bun.spawnSync({
-    cmd: options.args,
-    env: options.env || undefined,
-    cwd: options.cwd || undefined,
-    stdio: bunStdio,
-    windowsVerbatimArguments: options.windowsVerbatimArguments,
-    windowsHide: options.windowsHide,
-  });
+  var error;
+  try {
+    var {
+      stdout = null,
+      stderr = null,
+      success,
+      exitCode,
+      signalCode,
+    } = Bun.spawnSync({
+      cmd: options.args,
+      env: options.env || undefined,
+      cwd: options.cwd || undefined,
+      stdio: bunStdio,
+      windowsVerbatimArguments: options.windowsVerbatimArguments,
+      windowsHide: options.windowsHide,
+    });
+  } catch (err) {
+    error = err;
+    stdout = null;
+    stderr = null;
+  }
 
   const result = {
     signal: signalCode ?? null,
@@ -580,6 +587,10 @@ function spawnSync(file, args, options) {
     output: [null, stdout, stderr],
   };
 
+  if (error) {
+    result.error = error;
+  }
+
   if (stdout && encoding && encoding !== "buffer") {
     result.output[1] = result.output[1]?.toString(encoding);
   }
@@ -591,8 +602,11 @@ function spawnSync(file, args, options) {
   result.stdout = result.output[1];
   result.stderr = result.output[2];
 
-  if (!success) {
+  if (!success && error == null) {
     result.error = new SystemError(result.output[2], options.file, "spawnSync", -1, result.status);
+  }
+
+  if (result.error) {
     result.error.spawnargs = ArrayPrototypeSlice.$call(options.args, 1);
   }
 

test/js/node/child_process/child_process.test.ts

@@ -454,3 +454,13 @@ it.if(!isWindows)("spawnSync correctly reports signal codes", () => {
 
   expect(signal).toBe("SIGTRAP");
 });
+
+it("spawnSync(does-not-exist)", () => {
+  const x = spawnSync("does-not-exist");
+  expect(x.error?.code).toEqual("ENOENT");
+  expect(x.error.path).toEqual("does-not-exist");
+  expect(x.signal).toEqual(null);
+  expect(x.output).toEqual([null, null, null]);
+  expect(x.stdout).toEqual(null);
+  expect(x.stderr).toEqual(null);
+});