Fix #14791

src/bun_js.zig

@@ -371,9 +371,6 @@ pub const Run = struct {
         {
             if (this.vm.isWatcherEnabled()) {
                 var prev_promise = this.vm.pending_internal_promise;
-                if (prev_promise.status(vm.global.vm()) == .rejected) {
-                    _ = vm.unhandledRejection(this.vm.global, this.vm.pending_internal_promise.result(vm.global.vm()), this.vm.pending_internal_promise.asValue());
-                }
 
                 while (true) {
                     while (vm.isEventLoopAlive()) {

test/regression/issue/14791/14791.fixture.ts

@@ -0,0 +1,3 @@
+console.error("Program Launched.");
+// @ts-expect-error
+console.error(invalidvariablename);

test/regression/issue/14791/14791.test.ts

@@ -0,0 +1,44 @@
+import { test, expect } from "bun:test";
+import { bunExe } from "harness";
+
+for (const flags of [[], ["--watch"], ["--hot"]]) {
+  test("bun " + flags.map(f => f + " ").join("") + "prints the error only once", async () => {
+    const proc = Bun.spawn({
+      cmd: [bunExe(), ...flags, import.meta.dirname + "/14791.fixture.ts"],
+      env: {
+        "NO_COLOR": "1",
+      },
+      stdout: "inherit",
+      stdin: "inherit",
+      stderr: "pipe",
+    });
+    await Bun.sleep(200);
+    proc.kill();
+    await proc.exited;
+    let result = "";
+    for await (const item of proc.stderr.pipeThrough(new TextDecoderStream())) {
+      result += item;
+    }
+    expect(
+      result
+        .replaceAll(/at .+?14791\.fixture\.ts/g, "at 14791.fixture.ts")
+        .replace(/Bun v.+? \(.+?\)/, "")
+        .trim(),
+    ).toBe(
+      `
+Program Launched.
+1 | console.error("Program Launched.");
+2 | // @ts-expect-error
+3 | console.error(invalidvariablename);
+                                     ^
+ReferenceError: Can't find variable: invalidvariablename
+      at 14791.fixture.ts:3:34
+      at asyncFunctionResume (1:11)
+      at promiseReactionJobWithoutPromiseUnwrapAsyncContext (1:11)
+      at promiseReactionJob (1:11)
+`.trim(),
+    );
+  });
+}
+
+declare let TextDecoderStream: any;