fix: install script to work with bun

[0xcadams]

When installing @rocicorp/zero-sqlite3 with Bun (e.g., in a Docker container using oven/bun:1), the install fails and falls back to node-gyp, which requires Python and build tools:

prebuild-install warn install 'better-sqlite3' is not yet supported in Bun.
gyp ERR! find Python You need to install the latest version of Python.

Root Cause

prebuild-install actually succeeds in downloading and extracting the prebuilt binary under Bun. However, Bun prints a dumb compatibility warning and causes the process to exit with code 1. The original install script used ||, so any non-zero exit triggered the node-gyp fallback.

Solution

Change the install script to check if the binary file exists before falling back to node-gyp.

This handles the case where prebuild-install exits non-zero but still successfully downloaded the binary. The check is cross-platform (works on Windows, Linux, macOS).

Testing

Verified in oven/bun:1 Docker container - install now completes successfully without requiring Python or build tools.

You can test with:

docker run --rm -v ./:/app -w /app oven/bun:1 sh -c '
    rm -rf build && 
    bun run install; 
    echo "Exit code: $?"; 
    ls build/Release/better_sqlite3.node 2>/dev/null && echo "Success!" || echo "Failed"
  '

[0xcadams]

Demo of this working:

rocicorp/onboarding#20

[tantaman]

lgtm. Thanks for figuring this out.

[tantaman]

To make a new release you'll have to:

1. create a tag for the new version
2. push the tag
3. create the release for that tag in github

tag format: https://github.com/rocicorp/zero-sqlite3/tags