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v1.39.0

Schniz/fnmv1.39.0Mar 6, 2026by Schniz

AI Summary

This release focuses on performance improvements for shell startup and robustness of the `--use-on-cd` hook. It introduces new convenience flags and improves the user experience for version management.

Key Highlights

  • Shell startup is now faster due to optimization of the `--use-on-cd` hook.
  • New `fnm install --use` flag automatically switches to the installed version.
  • `fnm default` (with no arguments) now returns the current default version.
  • Improved robustness for `--use-on-cd` on zsh and Windows CMD.

New Features

  • Automatic switching after install (`fnm install --use`)
  • Querying current default version (`fnm default`)

Full Release Notes

**Performance & UX Improvements:**
- Shell startup is now faster: `fnm env --use-on-cd` applies the initial version during `fnm env` itself, eliminating an extra `fnm use` subprocess
- Improved `--use-on-cd` shell hook robustness (zsh hook deduplication on re-source, Windows CMD fixes for paths with spaces and drive changes)

**New Features:**
- `fnm install --use` flag to automatically switch to the version after installing
- `fnm default` (with no arguments) now returns the current default version

**Internal:**
- Rust toolchain upgraded to 1.88

**Docs/Maintenance:**
- Various README improvements, typo fixes, and CI workflow fixes

**Thanks to the new contributors:** @SunsetTechuila, @MangelMaxime, @CodingWithAnxiety, @zeroberry, @isaacl :hat-tip: