build.Dockerfile

# syntax=docker/dockerfile:1.2
ARG NODE_VERSION

FROM node:${NODE_VERSION}-alpine AS base
RUN apk add --no-cache cpio findutils git
WORKDIR /src

FROM base AS deps
RUN --mount=type=bind,target=.,rw \
  --mount=type=cache,target=/src/node_modules \
  yarn install

FROM deps AS build
RUN --mount=type=bind,target=.,rw \
  --mount=type=cache,target=/src/node_modules \
  yarn run build && mkdir /out && cp -Rf dist /out/

FROM scratch AS build-update
COPY --from=build /out /

FROM build AS build-validate
RUN --mount=type=bind,target=.,rw \
  git add -A && cp -rf /out/* .; \
  if [ -n "$(git status --porcelain -- dist)" ]; then \
    echo >&2 'ERROR: Build result differs. Please build first with "docker buildx bake build"'; \
    git status --porcelain -- dist; \
    exit 1; \
  fi

FROM deps AS format
RUN --mount=type=bind,target=.,rw \
  --mount=type=cache,target=/src/node_modules \
  yarn run format \
  && mkdir /out && find . -name '*.ts' -not -path './node_modules/*' | cpio -pdm /out

FROM scratch AS format-update
COPY --from=format /out /

FROM deps AS format-validate
RUN --mount=type=bind,target=.,rw \
  --mount=type=cache,target=/src/node_modules \
  yarn run format-check \