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Code Style Guide

Coding standards and best practices for Synap Backend

TypeScript Standards​

Type Safety​

  • ✅ Always use explicit types - No any types
  • ✅ Use Zod for validation - Runtime type checking
  • ✅ Strict mode enabled - strict: true in tsconfig
  • ✅ Type inference - Let TypeScript infer when possible

Example​

// ✅ Good
const createNote = async (input: CreateNoteInput): Promise<Note> => {
  const validated = CreateNoteInputSchema.parse(input);
  // ...
};

// ❌ Bad
const createNote = async (input: any): Promise<any> => {
  // ...
};

Code Organization​

File Structure​

packages/my-package/
├── src/
│   ├── index.ts          # Public exports
│   ├── types.ts          # Type definitions
│   ├── utils.ts          # Utility functions
│   └── services/         # Service classes
│       └── my-service.ts
└── tests/
    └── my-service.test.ts

Naming Conventions​

  • Files: kebab-case.ts
  • Classes: PascalCase
  • Functions: camelCase
  • Constants: UPPER_SNAKE_CASE
  • Types: PascalCase

Error Handling​

Use SynapError Types​

import { ValidationError, NotFoundError } from '@synap/core';

if (!input) {
  throw new ValidationError('Input is required', { field: 'input' });
}

if (!entity) {
  throw new NotFoundError('Entity not found', { entityId });
}

Logging​

Structured Logging​

import { createLogger } from '@synap/core';

const logger = createLogger({ module: 'my-service' });

logger.info({ userId, entityId }, 'Processing request');
logger.error({ err: error }, 'Failed to process');
logger.debug({ data }, 'Debug information');

Testing​

Unit Tests​

import { describe, it, expect } from 'vitest';

describe('MyService', () => {
  it('should create entity', async () => {
    const result = await service.create({ name: 'Test' });
    expect(result.id).toBeDefined();
  });
});

Documentation​

JSDoc Comments​

/**
 * Creates a new note entity
 * 
 * @param input - Note creation input
 * @returns Created note with ID
 * @throws {ValidationError} If input is invalid
 */
export async function createNote(input: CreateNoteInput): Promise<Note> {
  // ...
}

Next: See Testing for testing guidelines.