Building a Dockerfile

A production Mochi app is a single Bun process. This example image is a simple one-stage build on oven/bun:1.3-alpine — no Node, no preprocessor, no shell at runtime.

Minimal Dockerfile

# file: Dockerfile
FROM oven/bun:1.3-alpine
WORKDIR /app
COPY . .
RUN bun install --production
RUN bun run build
EXPOSE 3333
CMD ["bun", "run", "start"]

Build and run:

docker build -t my-app .
docker run --rm -p 3333:3333 my-app

A one-route app lands at ~160 MB. ~87 MB of that is the Bun binary itself — the floor for any Bun-based image is around ~105 MB.

.dockerignore

Exclude artifacts and local state from the build context — they’re regenerated inside the image and just inflate the upload:

# file: .dockerignore
node_modules
.mochi
.git
.env*

--production and devDeps

bun install --production omits everything under devDependencies. Keep mochi-framework and svelte in dependencies; move svelte-check, typescript, and build-time scripts to devDependencies.