FROM node:20-slim AS base
ENV PNPM_HOME="/pnpm"
ENV PATH="$PNPM_HOME:$PATH"
RUN corepack enable
COPY . /app
WORKDIR /app

FROM base AS prod-deps
RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile

FROM base AS build
RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
RUN pnpm run build

# Stage 2: Minimal image for exporting build artifacts
FROM alpine:latest

# Set working directory for output
WORKDIR /app

# Copy the built files from the builder stage
COPY --from=prod-deps /app/node_modules /app/node_modules
COPY --from=build /app/build .

# No CMD because this image is just used to extract build files