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Summary of ChangesHello @LouisLetcher, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request lays the foundational groundwork for a modern, cloud-native MEAN stack application. It provides a fully configured environment for rapid development, emphasizing best practices such as containerization, strict TypeScript, and robust code quality tooling. The changes enable developers to quickly spin up a new project with a well-defined architecture for both the API and the user interface. Highlights
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Code Review
This is a great start for a comprehensive MEAN stack boilerplate. The project structure is well-organized, and it incorporates many modern best practices like TypeScript, Docker, environment variable validation with Zod, and a solid code quality setup with ESLint, Prettier, and Husky. The backend is robust with features like rate limiting, structured logging, and graceful shutdown hooks. The frontend uses modern Angular with standalone components and signals. My review focuses on further improving robustness, developer experience, and adherence to best practices, particularly around configuration management, Docker setup, and resource handling. I've identified a few areas for improvement, including a critical issue with missing environment variables in the Docker setup that would break authentication, and some suggestions to make the configuration less confusing and the shutdown process more reliable.
| RATE_LIMIT_WINDOW_MS: ${RATE_LIMIT_WINDOW_MS:-900000} | ||
| RATE_LIMIT_MAX: ${RATE_LIMIT_MAX:-100} |
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The backend service is missing the JWT_SECRET and JWT_EXPIRES_IN environment variables. The application relies on these for the authentication module, but they are not being passed to the Docker container. This will cause authentication to fail in the Dockerized environment. You should add them to the environment section, sourcing them from the .env file. Using ${JWT_SECRET:?error message} will cause docker-compose to fail if the variable is not set, which is a good practice for required secrets.
RATE_LIMIT_WINDOW_MS: ${RATE_LIMIT_WINDOW_MS:-900000}
RATE_LIMIT_MAX: ${RATE_LIMIT_MAX:-100}
JWT_SECRET: ${JWT_SECRET:?JWT_SECRET must be set in .env file}
JWT_EXPIRES_IN: ${JWT_EXPIRES_IN:-7d}| COPY --from=builder /app/dist ./dist | ||
| COPY --from=builder /app/package*.json ./ | ||
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| RUN npm ci --only=production && npm cache clean --force |
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To fix the healthcheck defined in docker-compose.yml, you need to install a utility like wget in this production image, as it's not included in node:20-alpine by default.
RUN npm ci --only=production && npm cache clean --force
RUN apk add --no-cache wget
| const shutdown = async (signal: string): Promise<void> => { | ||
| logger.info({ signal }, 'Received shutdown signal'); | ||
| server.close(() => { | ||
| logger.info('HTTP server closed'); | ||
| process.exit(0); | ||
| }); | ||
| }; |
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The graceful shutdown handler closes the HTTP server but does not disconnect from MongoDB. This can leave open connections to the database and potentially lead to resource leaks. You should call disconnectMongo() as part of the shutdown process to ensure a clean exit.
| const shutdown = async (signal: string): Promise<void> => { | |
| logger.info({ signal }, 'Received shutdown signal'); | |
| server.close(() => { | |
| logger.info('HTTP server closed'); | |
| process.exit(0); | |
| }); | |
| }; | |
| const shutdown = (signal: string): void => { | |
| logger.info({ signal }, 'Received shutdown signal'); | |
| server.close(async () => { | |
| logger.info('HTTP server closed'); | |
| await disconnectMongo(); | |
| process.exit(0); | |
| }); | |
| }; |
| mongodb: | ||
| condition: service_healthy | ||
| healthcheck: | ||
| test: ['CMD', 'wget', '-q', '-O', '-', 'http://localhost:3000/health/readiness'] |
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The healthcheck for the backend service uses wget, but the node:20-alpine base image specified in backend/Dockerfile does not include wget by default. This will cause the healthcheck to fail, and Docker may incorrectly report the service as unhealthy. You should install wget in the backend's Dockerfile. I've added a corresponding suggestion on the backend/Dockerfile.
| cp .env.example .env | ||
| cp backend/.env.example backend/.env |
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The setup requires two separate .env files (.env at the root and backend/.env) with several overlapping variables (e.g., NODE_ENV, MONGODB_URI, JWT_SECRET). This can be confusing for developers and prone to configuration errors. Consider simplifying this to a single .env file at the project root. The backend application can be configured (e.g., using the dotenv package's path option) to read from the root-level file during local development.
| "build": "tsc", | ||
| "start": "node dist/server.js", | ||
| "lint": "eslint \"src/**/*.ts\" \"tests/**/*.ts\"", | ||
| "test": "jest --runInBand --forceExit", |
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The test script includes the --forceExit flag. This is generally discouraged as it can mask underlying issues in your tests, such as open handles (e.g., database connections, timers) that prevent Jest from exiting gracefully. It's better to ensure your tests clean up all resources properly.
| "test": "jest --runInBand --forceExit", | |
| "test": "jest --runInBand", |
| CORS_ORIGIN: z.string().default('http://localhost:4200'), | ||
| RATE_LIMIT_WINDOW_MS: z.coerce.number().positive().default(900000), | ||
| RATE_LIMIT_MAX: z.coerce.number().positive().default(100), | ||
| JWT_SECRET: z.string().optional(), |
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JWT_SECRET is defined as optional in the environment schema. However, if the authentication module is used, a missing secret will cause runtime errors. It's better to enforce its presence at startup to fail fast. Consider making it a required variable by removing .optional() and ensuring it's not an empty string.
| JWT_SECRET: z.string().optional(), | |
| JWT_SECRET: z.string().min(1), |
| export function loadConfig(): Env { | ||
| const result = envSchema.safeParse(process.env); | ||
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| if (!result.success) { | ||
| logger.error({ errors: result.error.flatten() }, 'Environment validation failed'); | ||
| throw result.error; | ||
| } | ||
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| logger.info( | ||
| { env: result.data.NODE_ENV, port: result.data.PORT }, | ||
| 'Configuration loaded successfully' | ||
| ); | ||
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| return result.data; | ||
| } |
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The loadConfig function is called in multiple places (app.ts, rateLimiter.ts), causing environment variables to be parsed and validated multiple times on startup. This is inefficient. You should ensure the configuration is loaded only once and shared as a singleton. A simple way to achieve this is to cache the configuration after the first load.
let loadedConfig: Env | undefined;
export function loadConfig(): Env {
if (loadedConfig) {
return loadedConfig;
}
const result = envSchema.safeParse(process.env);
if (!result.success) {
logger.error({ errors: result.error.flatten() }, 'Environment validation failed');
throw result.error;
}
logger.info(
{ env: result.data.NODE_ENV, port: result.data.PORT },
'Configuration loaded successfully'
);
loadedConfig = result.data;
return loadedConfig;
}| export async function connectMongo(uri: string): Promise<void> { | ||
| const maxRetries = 5; | ||
| const retryDelayMs = 2000; | ||
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| for (let attempt = 1; attempt <= maxRetries; attempt++) { | ||
| try { | ||
| await mongoose.connect(uri); | ||
| logger.info('MongoDB connected successfully'); | ||
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| mongoose.connection.on('error', (err) => { | ||
| logger.error({ err }, 'MongoDB connection error'); | ||
| }); | ||
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| mongoose.connection.on('disconnected', () => { | ||
| logger.warn('MongoDB disconnected'); | ||
| }); | ||
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| return; | ||
| } catch (err) { | ||
| logger.warn({ attempt, maxRetries, err }, 'MongoDB connection failed, retrying...'); | ||
| if (attempt === maxRetries) { | ||
| throw err; | ||
| } | ||
| await new Promise((resolve) => setTimeout(resolve, retryDelayMs)); | ||
| } | ||
| } | ||
| } |
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The Mongoose connection event listeners (error, disconnected) are attached inside the connection retry loop. Since mongoose.connection is a singleton event emitter, this could lead to multiple listeners being attached if the connection logic were ever to be called more than once. It's more robust to attach these listeners once, outside of the connection loop.
export async function connectMongo(uri: string): Promise<void> {
mongoose.connection.on('error', (err) => {
logger.error({ err }, 'MongoDB connection error');
});
mongoose.connection.on('disconnected', () => {
logger.warn('MongoDB disconnected');
});
const maxRetries = 5;
const retryDelayMs = 2000;
for (let attempt = 1; attempt <= maxRetries; attempt++) {
try {
await mongoose.connect(uri);
logger.info('MongoDB connected successfully');
return;
} catch (err) {
logger.warn({ attempt, maxRetries, err }, 'MongoDB connection failed, retrying...');
if (attempt === maxRetries) {
throw err;
}
await new Promise((resolve) => setTimeout(resolve, retryDelayMs));
}
}
}| import { logger } from '../../utils/logger.js'; | ||
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| /** Mongoose connection state: 1 = connected */ | ||
| const CONNECTED_STATE = 1; |
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You are using the magic number 1 to represent MongoDB's connected state. For better readability and to avoid potential issues if the state values change in future Mongoose versions, it's recommended to use the ConnectionStates enum provided by Mongoose. You'll need to update the import on line 2 to import mongoose, { ConnectionStates } from 'mongoose';.
| const CONNECTED_STATE = 1; | |
| const CONNECTED_STATE = ConnectionStates.connected; |
2 participants
Initial commit for a comprehensive, modern, cloud-native MEAN stack boilerplate, providing a robust foundation for new projects adhering to 12-Factor App principles.