Deno 2.1.0 panics on Linux, after saving a file when running with --watch

[argshook]

👋🏻 updated to deno 2.1.0 today. I'm working on a fresh project and with 2.1.0 saving files is now making deno to panic.

originally installed deno with curl -fsSL https://deno.land/install.sh | sh.
upgraded to 2.1.0 with deno upgrade

$ deno --version
deno 2.1.0 (stable, release, x86_64-unknown-linux-gnu)
v8 13.0.245.12-rusty
typescript 5.6.2

$ uname -a
Linux my-hostname 6.11.7-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 08 Nov 2024 17:57:56 +0000 x86_64 GNU/Linux

Repro

1. create new fresh project: deno run -A -r https://fresh.deno.dev.
2. open any file that is within --watch (like islands/Counter.tsx)
3. hit save in editor.
4. observe deno panic

Below is the output of RUST_BACKTRACE=full deno task start:

============================================================
Deno has panicked. This is a bug in Deno. Please report this
at https://github.com/denoland/deno/issues/new.
If you can reliably reproduce this panic, include the
reproduction steps and re-run with the RUST_BACKTRACE=1 env
var set and include the backtrace in your report.

Platform: linux x86_64
Version: 2.1.0
Args: ["/home/user/.deno/bin/deno", "run", "-A", "--watch=static/,routes/", "dev.ts"]

thread 'main' panicked at cli/util/file_watcher.rs:189:64:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0:     0x5d95c0b4acca - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h304520fd6a30aa07
   1:     0x5d95c0b7bf7b - core::fmt::write::hf5713710ce10ff22
   2:     0x5d95c0b444d3 - std::io::Write::write_fmt::hda708db57927dacf
   3:     0x5d95c0b4c4d2 - std::panicking::default_hook::{{closure}}::he1ad87607d0c11c5
   4:     0x5d95c0b4c13e - std::panicking::default_hook::h81c8cd2e7c59ee33
   5:     0x5d95c1196468 - deno::setup_panic_hook::{{closure}}::h6b16ad28b68f869c
   6:     0x5d95c0b4ce02 - std::panicking::rust_panic_with_hook::had2118629c312a4a
   7:     0x5d95c0b4cab7 - std::panicking::begin_panic_handler::{{closure}}::h7fa5985d111bafa2
   8:     0x5d95c0b4b1a9 - std::sys::backtrace::__rust_end_short_backtrace::h704d151dbefa09c5
   9:     0x5d95c0b4c744 - rust_begin_unwind
  10:     0x5d95c0b78f33 - core::panicking::panic_fmt::h3eea515d05f7a35e
  11:     0x5d95c0b79127 - core::panicking::panic_bounds_check::hab02a8df06d3a143
  12:     0x5d95c0e495a7 - <alloc::vec::Vec<T,A> as core::ops::index::Index<I>>::index::h89ec363596bcb4e1
  13:     0x5d95c1165b0b - deno::util::file_watcher::WatcherCommunicator::show_path_changed::h803bce6e75209163
  14:     0x5d95c1133797 - deno::tools::run::run_script::{{closure}}::hd8ceaed09991b352
  15:     0x5d95c119108b - deno::spawn_subcommand::{{closure}}::hdc7951bcc91e0c50
  16:     0x5d95c0b8f7de - <deno_unsync::tokio::task::MaskFutureAsSend<F> as core::future::future::Future>::poll::h51a76d7904c4e5b8
  17:     0x5d95c0de4914 - tokio::runtime::task::raw::poll::hee3b652d7b82c112
  18:     0x5d95c1197f3f - deno::main::h7b7bf2b36ec39222
  19:     0x5d95c0c821c1 - std::sys::backtrace::__rust_begin_short_backtrace::hc3b3f90331ffc550
  20:     0x5d95c0c7ceee - std::rt::lang_start::{{closure}}::h034aed1b20f3897e
  21:     0x5d95c0b38c90 - std::rt::lang_start_internal::h4d90db0530245041
  22:     0x5d95c1219595 - main
  23:     0x7a534ccdee08 - <unknown>
  24:     0x7a534ccdeecc - __libc_start_main
  25:     0x5d95bf48f029 - _start
  26:                0x0 - <unknown>

[yjavaherian]

same here in windows

[dsherret]

@yjavaherian run deno upgrade