Deno Buildpack for Scalingo

A custom Heroku-compatible buildpack that installs Deno runtime.

Usage

Single Buildpack

scalingo env-set BUILDPACK_URL=https://github.com/YOUR_ORG/deno-buildpack

Multi-Buildpack (recommended for this project)

Create a .buildpacks file in your project root:

https://github.com/Scalingo/nodejs-buildpack
https://github.com/YOUR_ORG/deno-buildpack
https://github.com/Scalingo/go-buildpack

Order matters! Node.js first (for npx), then Deno, then Go.

Configuration

Specify Deno Version

Option 1: Environment variable

scalingo env-set DENO_VERSION=2.1.4

Option 2: .deno-version file in project root

2.1.4

Default version: 2.1.4

Detection

The buildpack activates when it finds any of:

• deno.json
• deno.jsonc
• deno.lock
• .deno-version
• Any .ts file in root

What Gets Installed

At build time:

• Deno binary downloaded to cache
• Binary copied to /app/.deno/bin/
• Dependencies cached (if deno.lock exists)

At runtime:

• deno command available in PATH
• DENO_DIR set to /app/.deno/cache

Runtime Availability (Multi-Buildpack)

With the multi-buildpack setup above, at runtime you'll have:

Command	Provided By
node, npm, npx	nodejs-buildpack
deno	deno-buildpack (this)
Your Go binary	go-buildpack

All three are in PATH because each buildpack adds a .profile.d/*.sh script.

Verification

After deployment, verify Deno is available:

scalingo run deno --version
# deno 2.1.4

Local Testing

# Simulate buildpack execution
mkdir -p /tmp/{build,cache,env}
cp -r your-app/* /tmp/build/
./bin/detect /tmp/build && ./bin/compile /tmp/build /tmp/cache /tmp/env

License

MIT