added standalone test for NextJS, making the image much smaller

gdf.js

@@ -154,6 +154,15 @@ export class GDF {
     return !!this.#pj.dependencies?.next
   }
 
+  get standaloneNextjs() {
+    if (!this.nextjs) return false;
+
+    if (fs.existsSync(path.join(this._appdir, `next.config.mjs`))) {
+      const config = fs.readFileSync(path.join(this._appdir, `next.config.mjs`), 'utf-8')
+      return /output\s*:\s*(["'`])standalone\1/.test(config)
+    } else return false;
+  }
+
   // Does this application use nuxt.js?
   get nuxtjs() {
     return !!this.#pj.dependencies?.nuxt

templates/Dockerfile.ejs

@@ -140,6 +140,10 @@ COPY --from=build /app/dist /app/dist
 
 ENV PORT=4321
 ENV HOST=0.0.0.0
+<% } else if (standaloneNextjs) { -%>
+COPY --from=build /app/.next/standalone /app
+COPY --from=build /app/.next/static /app/.next/static
+COPY --from=build /app/public /app/public
 <% } else { -%>
 COPY --from=build /app /app
 <% } -%>
@@ -233,6 +237,8 @@ EXPOSE <%= port %>
 <% } -%>
 <% if (foreman) { -%>
 CMD [ "<%= npx %>", "foreman", "start", "--procfile", "Procfile.prod" ]
+<% } else if (standaloneNextjs) { -%>
+CMD [ "node", "server.js" ]
 <% } else if (Array.isArray(startCommand)) { -%>
 CMD <%- JSON.stringify(startCommand, null, 1).replaceAll(/\n\s*/g, " ") %>
 <% } else { -%>

test/frameworks/next-standalone/.dockerignore

@@ -0,0 +1,36 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

test/frameworks/next-standalone/Dockerfile

@@ -0,0 +1,47 @@
+# syntax = docker/dockerfile:1
+
+# Adjust NODE_VERSION as desired
+ARG NODE_VERSION=20.9.0
+FROM node:${NODE_VERSION}-slim as base
+
+LABEL fly_launch_runtime="Next.js"
+
+# Next.js app lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base as build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential node-gyp pkg-config python-is-python3
+
+# Install node modules
+COPY --link package-lock.json package.json ./
+RUN npm ci --include=dev
+
+# Copy application code
+COPY --link . .
+
+# Build application
+RUN npm run build
+
+# Remove development dependencies
+RUN npm prune --omit=dev
+
+
+# Final stage for app image
+FROM base
+
+# Copy built application
+COPY --from=build /app/.next/standalone /app
+COPY --from=build /app/.next/static /app/.next/static
+COPY --from=build /app/public /app/public
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000
+CMD [ "node", "server.js" ]

test/frameworks/next-standalone/next.config.mjs

@@ -0,0 +1,6 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  output: "standalone"
+};
+
+export default nextConfig;