FROM node:lts # Install system dependencies RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* WORKDIR /usr/src/app # Install app dependencies COPY package.json ./ RUN npm install # Copy rest of source COPY . . # Build from source using webpack RUN npx webpack --config webpack.config.js # Runtime ENV NODE_ENV=production ENTRYPOINT ["node", "bundle.js"] CMD ["http://localhost:3000"]
# Node modules to avoid copying into image (we rebuild anyway) node_modules/ # Git repository .git/ .gitignore # Local environment / IDE artifacts .DS_Store *.log .npmrc npm-debug.log* # Build outputs dist/ build/ coverage/ # Misc .env *.swp
- Failing step: [5/7] RUN npm install (Dockerfile line 10)
- Exit code: 1
- Exact error message (preserved):
npm error code ERESOLVE
npm error ERESOLVE unable to resolve dependency tree
...
While resolving: reactopt@1.5.5
Found: react@15.7.0
node_modules/react
react@"^15.0 || 0.14.x" from the root project
Could not resolve dependency:
peer react@"^16.14.0" from react-dom@16.14.0
node_modules/react-dom
react-dom@"^16.0.0" from the root project
Fix the upstream dependency conflict, or retry this command with --force or --legacy-peer-deps
- Missing packages/files / version mismatch:
- Dependency conflict between React versions: root requires react@"^15.0 || 0.14.x", while react-dom@16.14.0 requires react@"^16.14.0".
- This prevents npm install from completing due to an unresolved peer dependency.
- Additional version info:
- npm notice: New minor version of npm available! 11.9.0 -> 11.11.1 (not required to fix, but present in logs)
- Logs referenced:
- A complete log of this run can be found in: /root/.npm/_logs/2026-03-18T13_47_05_893Z-debug-0.log
- For a full report see: /root/.npm/_logs/2026-03-18T13_47_05_893Z-eresolve-report.txtFROM node:lts # Install system dependencies RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* WORKDIR /usr/src/app # Install app dependencies COPY package.json ./ RUN npm install --legacy-peer-deps # Copy rest of source COPY . . # Build from source using webpack RUN npx webpack --config webpack.config.js # Runtime ENV NODE_ENV=production ENTRYPOINT ["node", "bundle.js"] CMD ["http://localhost:3000"]
- Error: process "/bin/sh -c npx webpack --config webpack.config.js" did not complete successfully: exit code: 2 - Failing command/step: [7/7] RUN npx webpack --config webpack.config.js - Missing packages or files mentioned: - Module not found: Can't resolve 'bufferutil' in /usr/src/app/node_modules/ws/lib - Module not found: Can't resolve 'utf-8-validate' in /usr/src/app/node_modules/ws/lib - Module not found: Can't resolve 'child_process' in /usr/src/app/node_modules/puppeteer/lib - Module not found: Can't resolve 'child_process' in /usr/src/app/node_modules/puppeteer/node6 - Module not found: Can't resolve 'fs' in /usr/src/app - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/console-png - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/extract-zip - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/fd-slicer - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/fs.realpath - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/fs.realpath/old.js - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/glob - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/mime - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/mkdirp - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/puppeteer/lib - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/puppeteer/node6 - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/puppeteer/node6/Page.js - Module not found: Can't resolve 'fs' in /usr/src/app/node_modules/puppeteer/node6/Launcher.js - Module not found: Can't resolve 'readline' in /usr/src/app - Module not found: Can't resolve 'readline' in /usr/src/app/node_modules/puppeteer/lib - Module not found: Can't resolve 'net' in /usr/src/app/node_modules/https-proxy-agent - Module not found: Can't resolve 'tls' in /usr/src/app/node_modules/https-proxy-agent - Version/mismatch or environment notes: - Webpack version: 3.12.0 - npm notice: New minor version of npm available! 11.9.0 -> 11.11.1 Context: Dockerfile builds from node:lts; the final step fails during asset bundling with webpack, due to missing Node core modules and native/browser polyfills being unresolved in the bundle.
FROM node:lts # Install system dependencies RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* WORKDIR /usr/src/app # Install app dependencies COPY package.json ./ RUN npm install --legacy-peer-deps # Copy rest of source COPY . . # Runtime ENV NODE_ENV=production # Run the CLI directly from source (no bundling with webpack to avoid browser-specific bundling issues) ENTRYPOINT ["node", "main.js"] CMD ["http://localhost:3000"]
Concerns: Container runs as root; consider adding a non-root user for security., No HEALTHCHECK defined; for a CLI tool this may be unnecessary, but adding a minimal healthcheck could help in some deployments., No explicit EXPOSE; not required for a CLI tool, but if the tool serves a web service, exposing a port would be relevant. Smoke [PASS]: node --version Smoke [FAIL]: node main.js --help Output: [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0 Smoke [FAIL]: node main.js --version Output: [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0
const path = require('path');
module.exports = {
entry: "./main.js",
output: {
path: __dirname,
filename: "bundle.js"
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: [
'babel-loader',
],
},
],
},
resolve: {
modules: [
path.join(__dirname, 'node_modules'),
],
},
};const path = require('path');
module.exports = {
target: 'node',
entry: "./main.js",
output: {
path: __dirname,
filename: "bundle.js"
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: [
'babel-loader',
],
},
],
},
resolve: {
modules: [
path.join(__dirname, 'node_modules'),
],
},
node: {
__dirname: false,
__filename: false
}
};
Concerns: No .dockerignore shown; could accidentally copy host node_modules or other large files into the image via 'COPY . .', leading to bloated image or mismatched dependencies. Add a .dockerignore to exclude node_modules, dist, etc., npm install is run without using a lockfile (no package-lock.json usage). Consider using npm ci or npm install --production (with NODE_ENV=production) for reproducible production builds., CMD provides a default argument (http://localhost:3000) to the CLI. Ensure main.js actually accepts and uses a URL argument; otherwise this default may be misleading for users. Smoke [PASS]: test -f /usr/src/app/main.js Smoke [PASS]: node --version Smoke [FAIL]: node /usr/src/app/main.js --version Output: [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[48;5;16m[38;5;16m▄[0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0m [0
- Purpose: CLI audit tool (Reactopt) that opens a React app URL in Puppeteer, lets you interact, then type 'done' to collect window.data and run audits.
- How to run: npm start [url] (uri = process.argv[2]).
- Key dependencies and assets:
- console-png (attachTo(console)) and logo at __dirname + '/media/logo-cli.png'
- chalk, puppeteer, readline, fs
- Startup behavior:
- Console prints: "Reactopt is running - Interact with your app, don't close the browser, then type 'done' to perform audit."
- Opens Chromium (headless: false) at 1000x1000, navigates to the provided URL.
- Interaction/exit:
- User interacts with the page, then types 'done'.
- On 'done', page.evaluate(() => window.data) is called; if data exists, runs logAudits(data); browser closes afterwards.
- If data is missing or error occurs: logs "Error, no data collected. Try interacting more with your page."
- Data interface (window.data):
- { time, rerenders: [{ type, name, components }] }
- Used by audits to report load time and re-render events.
- Audits performed (logAudits):
- loadTime(data): prints "Page Load Time" and "Your page took {data.time} to load".
- componentRerenders(data):
- Prints "Component Re-rendering".
- If data.rerenders.length > 1:
- Prints "There are components that are potentially re-rendering unnecessarily. Below are identified events that triggered them:"
- For i from 1 to end, if data.rerenders[i].components.length > 0, prints: " $ {type} - {name} => {components}"
- Prints "Possible improvements to re-rendering" and two suggestions:
- "Consider utilizing shouldComponentDidUpdate of components that shouldn't be constantly re-rendering"
- "Note: this may affect functionality of child components"
- Else (no unnecessary re-renders): prints "Way to go, Idaho! No unnecessary re-rendering of components were detected."
- Output/exports:
- Exports: data, loadTime, printLine, componentRerenders
- Notable implementation details:
- Console rendering uses printLine(type, string) with styles for 'heading', 'pass', 'fail', 'suggestion', 'line'.
- Data fetch path: page.evaluate(() => window.data) then .then(logAudits).catch(...)
- Test data scaffold exists (commented) for testing.
- File references:
- Image/logo path: __dirname + '/media/logo-cli.png'
- CLI URL input: process.argv[2]
- Example phrases from code to expect in output:
- "Reactopt is running - Interact with your app, don't close the browser, then type 'done' to perform audit."
- "Page Load Time"
- "Your page took X to load"
- "Component Re-rendering"
- "There are components that are potentially re-rendering unnecessarily. Below are identified events that triggered them:"
- "Possible improvements to re-rendering"
- "ShouldComponentDidUpdate" (as written) and note about child components
- "Way to go, Idaho! No unnecessary re-rendering of components were detected."FROM node:lts AS builder # Install build dependencies and install modules WORKDIR /usr/src/app COPY package.json ./ RUN npm install --legacy-peer-deps # Copy rest of source and build COPY . . RUN npx webpack --config webpack.config.js FROM node:lts WORKDIR /usr/src/app # Copy built bundle from builder COPY --from=builder /usr/src/app/bundle.js ./bundle.js # Run the CLI bundle ENTRYPOINT ["node", "./bundle.js"]
Concerns: The build assumes webpack outputs bundle.js at /usr/src/app/bundle.js; if the webpack config outputs to a different path (e.g., dist/bundle.js), the final COPY will fail., COPY . . in the builder stage may copy node_modules or large/unwanted files into the image context; ensure a proper .dockerignore to keep the build context lean., There is no explicit validation of runtime CLI behavior (e.g., --version or --help). If the CLI doesn't implement a version/help flag, a smoke test relying on such flags may fail. Smoke [FAIL]: test -f bundle.js && echo 'bundle.js exists' || echo 'missing bundle.js Output: sh: 1: Syntax error: Unterminated quoted string Smoke [PASS]: node -v Smoke [PASS]: node bundle.js --version 2>&1 | head -n 1
# multi-stage build for reactopt CLI tool FROM node:lts AS builder WORKDIR /app # Install system dependencies required for npm/yarn and Puppeteer RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* # Install dependencies first to leverage Docker layer caching COPY package.json ./ RUN npm install --legacy-peer-deps # Copy the rest of the source and build the bundle with webpack COPY . . RUN npx webpack --config webpack.config.js # Runtime stage FROM node:lts WORKDIR /app # Install runtime dependencies RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* # Copy built assets from builder COPY --from=builder /app/bundle.js ./bundle.js COPY --from=builder /app/node_modules ./node_modules COPY --from=builder /app/package.json ./package.json # Create a non-root user for running the CLI RUN groupadd -r appuser && useradd -r -g appuser appuser && mkdir -p /home/appuser && chown -R appuser:appuser /app USER appuser # Run the bundled CLI by default; allow URL to be provided at runtime ENTRYPOINT ["node","bundle.js"]
node_modules/ .git/ dist/ coverage/ *.log .env README.md
Smoke [FAIL]: node bundle.js --version
Output: node:fs:560
return binding.open(
^
Error: ENOENT: no such file or directory, open '/app/media/logo-cli.png'
at Object.openSync (node:fs:560:18)
at Object.readFileSync (node:fs:444:35)
at Object.<anonymous> (/app/bundle.js:10804:36)
at __webpack_require__ (/app/bundle.js:20:30)
at /app/bundle.js:63:18
at Object.<anonymous> (/app/bundle.js:66:10)
at Module._compile (node:internal/modules/cjs/loader:1812:14)
at Object..js (node:internal/modules/cj
Smoke [FAIL]: node bundle.js --help
Output: node:fs:560
return binding.open(
^
Error: ENOENT: no such file or directory, open '/app/media/logo-cli.png'
at Object.openSync (node:fs:560:18)
at Object.readFileSync (node:fs:444:35)
at Object.<anonymous> (/app/bundle.js:10804:36)
at __webpack_require__ (/app/bundle.js:20:30)
at /app/bundle.js:63:18
at Object.<anonymous> (/app/bundle.js:66:10)
at Module._compile (node:internal/modules/cjs/loader:1812:14)
at Object..js (node:internal/modules/cj# multi-stage build for reactopt CLI tool FROM node:lts AS builder WORKDIR /app # Install system dependencies required for npm/yarn and Puppeteer RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* # Install dependencies first to leverage Docker layer caching COPY package.json ./ RUN npm install --legacy-peer-deps # Copy the rest of the source and build the bundle with webpack COPY . . RUN npx webpack --config webpack.config.js # Runtime stage FROM node:lts WORKDIR /app # Install runtime dependencies RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* # Copy built assets from builder COPY --from=builder /app/bundle.js ./bundle.js COPY --from=builder /app/node_modules ./node_modules COPY --from=builder /app/package.json ./package.json # Copy media assets needed at runtime COPY --from=builder /app/media ./media # Create a non-root user for running the CLI RUN groupadd -r appuser && useradd -r -g appuser appuser && mkdir -p /home/appuser && chown -R appuser:appuser /app USER appuser # Run the bundled CLI by default; allow URL to be provided at runtime ENTRYPOINT ["node","bundle.js"]
- VerifyBuild status: smoke_failed
- Concerns
- No .dockerignore shown; risk of sending node_modules or large files in build context (affects cache efficiency and image size).
- Dockerfile only installs ca-certificates at runtime; if Puppeteer or other native dependencies are used at runtime, additional system libraries may be required.
- Assumes webpack outputs to bundle.js and runtime copies bundle.js from /app; if build output changes, COPY instructions may need adjustment.
- Smoke tests
- FAIL: node bundle.js --version
- Output shows extensive ANSI color/blocks; no readable version string captured.
- FAIL: node bundle.js --help
- Output shows extensive ANSI color/blocks; no readable help text captured.
- FAIL: node bundle.js https://example.com
- Output shows extensive ANSI color/blocks; no actionable output captured.
- Key details preserved
- Commands run: node bundle.js --version, node bundle.js --help, node bundle.js https://example.com
- File path referenced: /app (for bundle.js runtime copy)
- Package name: ca-certificates (installed in Dockerfile)const path = require('path');
module.exports = {
entry: "./main.js",
target: 'node',
output: {
path: __dirname,
filename: "bundle.js"
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: [
'babel-loader',
],
},
],
},
resolve: {
modules: [
path.join(__dirname, 'node_modules'),
],
},
};Concerns: Dev dependencies are installed in the builder stage and then copied into the final image (node_modules from builder). This can bloat the runtime image and may include unnecessary dev dependencies. Consider pruning production dependencies in the final image (e.g., install production dependencies in the final stage or run npm prune --production)., COPY --from=builder /app/media ./media will fail if the media directory does not exist in the build context. Ensure media exists or adjust .dockerignore/.dockerfile accordingly.
Smoke [PASS]: test -f bundle.js
Smoke [FAIL]: node bundle.js --version
Output: node:fs:560
return binding.open(
^
Error: ENOENT: no such file or directory, open '//media/logo-cli.png'
at Object.openSync (node:fs:560:18)
at Object.readFileSync (node:fs:444:35)
at Object.<anonymous> (/app/bundle.js:10805:36)
at Object.<anonymous> (/app/bundle.js:10945:30)
at __webpack_require__ (/app/bundle.js:20:30)
at /app/bundle.js:63:18
at Object.<anonymous> (/app/bundle.js:66:10)
at Module._compile (node:internal/modules/cjs/loader:181
Smoke [FAIL]: node bundle.js --help
Output: node:fs:560
return binding.open(
^
Error: ENOENT: no such file or directory, open '//media/logo-cli.png'
at Object.openSync (node:fs:560:18)
at Object.readFileSync (node:fs:444:35)
at Object.<anonymous> (/app/bundle.js:10805:36)
at Object.<anonymous> (/app/bundle.js:10945:30)
at __webpack_require__ (/app/bundle.js:20:30)
at /app/bundle.js:63:18
at Object.<anonymous> (/app/bundle.js:66:10)
at Module._compile (node:internal/modules/cjs/loader:181# multi-stage build for reactopt CLI tool FROM node:lts AS builder WORKDIR /app # Install system dependencies required for npm/yarn and Puppeteer RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* # Install dependencies first to leverage Docker layer caching COPY package.json ./ RUN npm install --legacy-peer-deps # Copy the rest of the source and build the bundle with webpack COPY . . RUN npx webpack --config webpack.config.js # Runtime stage FROM node:lts WORKDIR /app # Install runtime dependencies RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/* # Copy built assets from builder COPY --from=builder /app/bundle.js ./bundle.js COPY --from=builder /app/node_modules ./node_modules COPY --from=builder /app/package.json ./package.json # Copy media assets needed at runtime COPY --from=builder /app/media ./media # Also copy media assets to /media as a quick workaround for asset loading paths COPY --from=builder /app/media /media # Create a non-root user for running the CLI RUN groupadd -r appuser && useradd -r -g appuser appuser && mkdir -p /home/appuser && chown -R appuser:appuser /app USER appuser # Run the bundled CLI by default; allow URL to be provided at runtime ENTRYPOINT ["node","bundle.js"]
Concerns: COPY . . in the build stage may overwrite node_modules installed by npm install if the build context contains node_modules; this can break reproducibility unless a .dockerignore excludes node_modules., The runtime stage copies media to /media and also copies /app/media to /media, which is redundant and could be simplified. Smoke [PASS]: test -f /app/bundle.js && echo bundle.js-present Smoke [PASS]: test -d /media && echo media-dir-present Smoke [PASS]: node -v >/dev/null 2>&1 && echo node-ok