[Bug]: Native Magic String index issues with UTF-16 characters #8685
Description
Reproduction link or steps
Repro here
What is expected?
.slice should return "string" and then be removed from the output using .remove.
What is actually happening?
Rolldown crashes and fails to remove or index the string properly.
Rolldown panicked. This is a bug in Rolldown, not your code.
thread '<unnamed>' (2) panicked at crates/string_wizard/src/magic_string/slice.rs:76:31:
byte index 17 is not a char boundary; it is inside '\u{fe0f}' (bytes 15..18) of `some 🤷♂️ string`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtraceSystem Info
System:
OS: macOS 26.2
CPU: (10) arm64 Apple M4
Memory: 2.17 GB / 16.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 24.13.0 - /Users/jordan/.local/state/fnm_multishells/18650_1773481082557/bin/node
npm: 11.6.2 - /Users/jordan/.local/state/fnm_multishells/18650_1773481082557/bin/npm
bun: 1.3.10 - /opt/homebrew/bin/bun
Deno: 2.7.5 - /opt/homebrew/bin/deno
Browsers:
Safari: 26.2
npmPackages:
rolldown: ^1.0.0-rc.9 => 1.0.0-rc.9Any additional comments?
This issue also seems to apply to other (if not all) index-based methods such as .overwrite
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