# Dockerfile for building the BOM Local Radar Card
# This isolates Node.js/npm in a container for security
FROM node:20-alpine

WORKDIR /build

# Copy the declared dependency set first for a reproducible cached build.
COPY package.json package-lock.json ./
COPY tsconfig.json ./
COPY rollup.config.js ./

# Install the exact locked dependencies, including the build-only toolchain.
RUN npm ci

# Copy source files
COPY src/ ./src/

# Default command: run the build
# This ensures the build runs when the container starts, not during image creation
# Use BUILD_TARGET to allow running "watch" or other scripts
CMD ["sh", "-c", "npm run ${BUILD_TARGET:-build}"]