How do I downgrade bun or install a previous version?

[btakita]

I'm currently on the latest version of bun (1.0.10) & am having an issue with it.

I would like to use 1.0.9 until the bug is fixed. What is the best way to downgrade to 1.0.9?

[btakita]

curl -fsSl https://bun.sh/install | bash -s "bun-v1.0.9"

[wottpal]

Minor heads up for everyone who installed it via Homebrew: Run brew uninstall bun first 🫡

[e-simpson]

Doesn't seem to work anymore. Stuck on Bun 1.0.24.

I get bun was installed successfully to ~/.bun/bin/bun however no version downgrade in usage.
Mac OS X 14 on M1 Pro (Darwin 23.1.0 arm64 arm)

[wottpal]

same. did you solve it.

[e-simpson]

I needed a specific version in my remote builds so I ended up using npx to build with a specific version.
Example: npx bun@1.0.26 run build

[nightness]

Verify brew's bun is not installed

brew uninstall bun
brew untap oven-sh/bun

I was updating an older version of bun to 1.0.13, and the curl -fsSl https://bun.sh/install | bash -s "bun-v1.0.13" worked. I asked ChatGPT to create an uninstall script based on the install script for bun... Maybe give that a try and then install a specific version. The uninstall script looks fine, but use at your own risk.

#!/usr/bin/env bash
set -euo pipefail

platform=$(uname -ms)

# Reset
Color_Off=''

# Regular Colors
Red=''
Green=''
Dim='' # White

# Bold
Bold_White=''
Bold_Green=''

if [[ -t 1 ]]; then
    # Reset
    Color_Off='\033[0m' # Text Reset

    # Regular Colors
    Red='\033[0;31m'   # Red
    Green='\033[0;32m' # Green
    Dim='\033[0;2m'    # White

    # Bold
    Bold_Green='\033[1;32m' # Bold Green
    Bold_White='\033[1m'    # Bold White
fi

error() {
    echo -e "${Red}error${Color_Off}:" "$@" >&2
    exit 1
}

info() {
    echo -e "${Dim}$@ ${Color_Off}"
}

info_bold() {
    echo -e "${Bold_White}$@ ${Color_Off}"
}

success() {
    echo -e "${Green}$@ ${Color_Off}"
}

install_env=BUN_INSTALL
install_dir=${!install_env:-$HOME/.bun}
bin_dir=$install_dir/bin
exe=$bin_dir/bun

tildify() {
    if [[ $1 = $HOME/* ]]; then
        local replacement=\~/

        echo "${1/$HOME\//$replacement}"
    else
        echo "$1"
    fi
}

remove_line_from_file() {
    local file="$1"
    local line="$2"
    
    if [[ -f "$file" ]]; then
        sed -i.bak "/$line/d" "$file" && rm "$file.bak"
    fi
}

tilde_bin_dir=$(tildify "$bin_dir")

# Remove bun executable
if [[ -f $exe ]]; then
    rm "$exe" || error "Failed to remove bun executable"
    success "Removed bun executable from $Bold_Green$(tildify "$exe")"
fi

# Remove installation directory if empty
if [[ -d $install_dir && ! "$(ls -A "$install_dir")" ]]; then
    rmdir "$install_dir" || error "Failed to remove install directory"
    success "Removed install directory $Bold_Green$(tildify "$install_dir")"
fi

# Remove environment variable and PATH modifications
remove_path_commands=(
    "export $install_env=$install_dir"
    "export PATH=\"$bin_dir:\$PATH\""
)

remove_fish_commands=(
    "set --export $install_env $install_dir"
    "set --export PATH $bin_dir \$PATH"
)

case $(basename "$SHELL") in
fish)
    fish_config=$HOME/.config/fish/config.fish
    for command in "${remove_fish_commands[@]}"; do
        remove_line_from_file "$fish_config" "$command"
    done
    success "Removed bun configuration from $Bold_Green$(tildify "$fish_config")"
    ;;
zsh)
    zsh_config=$HOME/.zshrc
    for command in "${remove_path_commands[@]}"; do
        remove_line_from_file "$zsh_config" "$command"
    done
    success "Removed bun configuration from $Bold_Green$(tildify "$zsh_config")"
    ;;
bash)
    bash_configs=(
        "$HOME/.bashrc"
        "$HOME/.bash_profile"
    )

    if [[ ${XDG_CONFIG_HOME:-} ]]; then
        bash_configs+=(
            "$XDG_CONFIG_HOME/.bash_profile"
            "$XDG_CONFIG_HOME/.bashrc"
            "$XDG_CONFIG_HOME/bash_profile"
            "$XDG_CONFIG_HOME/bashrc"
        )
    fi

    for bash_config in "${bash_configs[@]}"; do
        if [[ -w $bash_config ]]; then
            for command in "${remove_path_commands[@]}"; do
                remove_line_from_file "$bash_config" "$command"
            done
            success "Removed bun configuration from $Bold_Green$(tildify "$bash_config")"
            break
        fi
    done
    ;;
*)
    echo "Please manually remove bun environment variables from your shell configuration."
    ;;
esac

success "bun was uninstalled successfully."

[mountainash]

Just adding that the "offical documentation" about downgrading also includes instructions for Windows.