Dockerfile

FROM node:20-slim

# Install build dependencies
RUN apt-get update && apt-get install -y \
    git \
    python3 \
    cmake \
    build-essential \
    curl \
    wget \
    ca-certificates \
    xz-utils \
    && rm -rf /var/lib/apt/lists/*

# Set toolchain paths
ENV INSTALL_BASE=/opt/wasm-toolchains
ENV EMSDK_PATH=/opt/wasm-toolchains/emsdk
ENV SWIFTWASM_PATH=/opt/wasm-toolchains/swiftwasm

# --- Install Emscripten ---
RUN mkdir -p ${INSTALL_BASE} && \
    git clone https://github.com/emscripten-core/emsdk.git ${EMSDK_PATH} && \
    cd ${EMSDK_PATH} && \
    ./emsdk install latest && \
    ./emsdk activate latest

# --- Install SwiftWasm (Linux x86_64) ---
RUN mkdir -p ${SWIFTWASM_PATH} && \
    SWIFTWASM_VERSION="swift-wasm-5.10-SNAPSHOT-2023-11-02-a" && \
    SWIFTWASM_TARBALL="${SWIFTWASM_VERSION}-ubuntu22.04_x86_64.tar.gz" && \
    SWIFTWASM_URL="https://github.com/swiftwasm/swift/releases/download/${SWIFTWASM_VERSION}/${SWIFTWASM_TARBALL}" && \
    cd /tmp && \
    curl -L -o "${SWIFTWASM_TARBALL}" "${SWIFTWASM_URL}" && \
    tar xzf "${SWIFTWASM_TARBALL}" -C ${SWIFTWASM_PATH} --strip-components=1 && \
    rm -f "${SWIFTWASM_TARBALL}"

# Set up app
WORKDIR /app
COPY package*.json ./
RUN npm ci

COPY . .
RUN npm run build

# HF Space default port is 7860, but we accept PORT env
EXPOSE 7860
ENV PORT=7860

CMD ["node", "dist/server.js"]