repl: strip trailing CR when loading history (Windows CRLF)

src/runtime/cli/repl.rs

@@ -254,7 +254,10 @@ impl History {
             sys::Result::Err(_) => return Ok(()),
         };
 
-        for line in content.split(|b: &u8| *b == b'\n') {
+        for mut line in content.split(|b: &u8| *b == b'\n') {
+            if line.last() == Some(&b'\r') {
+                line = &line[..line.len() - 1];
+            }
             if !line.is_empty() {
                 self.entries.push(Box::<[u8]>::from(line));
             }

src/runtime/cli/repl.zig

@@ -196,7 +196,8 @@ const History = struct {
         defer self.allocator.free(content);
 
         var lines = std.mem.splitScalar(u8, content, '\n');
-        while (lines.next()) |line| {
+        while (lines.next()) |line_| {
+            const line = if (line_.len > 0 and line_[line_.len - 1] == '\r') line_[0 .. line_.len - 1] else line_;
             if (line.len > 0) {
                 const entry = try self.allocator.dupe(u8, line);
                 try self.entries.append(entry);

test/js/bun/repl/repl.test.ts

@@ -910,6 +910,40 @@ describe.concurrent("Bun REPL", () => {
       expect(exitCode).toBe(0);
     });
   });
+
+  describe("history file", () => {
+    // A history file written on Windows can contain CRLF line endings. Loading
+    // it must strip the trailing '\r' so entries don't carry a stray CR through
+    // recall, .history output, or the next save.
+    test("strips CRLF when loading existing history", async () => {
+      using dir = tempDir("repl-history-crlf", {
+        ".bun_repl_history": "old_one\r\nold_two\r\n",
+      });
+
+      await using proc = Bun.spawn({
+        cmd: [bunExe(), "repl"],
+        stdin: Buffer.from("new_three\n.exit\n"),
+        stdout: "pipe",
+        stderr: "pipe",
+        env: {
+          ...bunEnv,
+          TERM: "dumb",
+          NO_COLOR: "1",
+          HOME: String(dir),
+          USERPROFILE: String(dir), // Windows fallback
+        },
+      });
+      const exitCode = await proc.exited;
+
+      const saved = await Bun.file(path.join(String(dir), ".bun_repl_history")).text();
+      // Saved history must not preserve carriage returns from the original file.
+      expect(saved).not.toContain("\r");
+      expect(saved).toContain("old_one\n");
+      expect(saved).toContain("old_two\n");
+      expect(saved).toContain("new_three\n");
+      expect(exitCode).toBe(0);
+    });
+  });
 });
 
 // Interactive terminal-based REPL tests