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Write TypeScript code following best practices. Use when developing TypeScript/JavaScript applications. Covers type safety, patterns, and tooling.
Baseado na classificação ocupacional SOC
Biome 2.x linting and formatting patterns. Use when configuring code quality tools, setting up linting rules, formatting code, or integrating with CI/CD. Covers migration from ESLint/Prettier.
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React development patterns. Use when building React components, managing state, creating custom hooks, or optimizing React applications. Covers React 19 features, TypeScript integration, and composition patterns.
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| name | typescript |
| description | Write TypeScript code following best practices. Use when developing TypeScript/JavaScript applications. Covers type safety, patterns, and tooling. |
# Initialize with pnpm
pnpm init
pnpm add -D typescript @types/node
# TypeScript config
npx tsc --init
{
"compilerOptions": {
"target": "ES2022",
"module": "NodeNext",
"moduleResolution": "NodeNext",
"strict": true,
"noUncheckedIndexedAccess": true,
"noImplicitReturns": true,
"esModuleInterop": true,
"skipLibCheck": true,
"outDir": "./dist"
},
"include": ["src/**/*"]
}
type Result<T> =
| { success: true; data: T }
| { success: false; error: Error };
function handleResult(result: Result<User>) {
if (result.success) {
console.log(result.data); // User
} else {
console.error(result.error); // Error
}
}
type UserId = string & { readonly brand: unique symbol };
type OrderId = string & { readonly brand: unique symbol };
function createUserId(id: string): UserId {
return id as UserId;
}
// Make all properties optional
Partial<User>
// Make all properties required
Required<User>
// Pick specific properties
Pick<User, 'id' | 'email'>
// Omit specific properties
Omit<User, 'password'>
// Make properties readonly
Readonly<User>
// Result type pattern
type Result<T, E = Error> =
| { ok: true; value: T }
| { ok: false; error: E };
async function fetchUser(id: string): Promise<Result<User>> {
try {
const user = await db.users.findById(id);
if (!user) {
return { ok: false, error: new Error('User not found') };
}
return { ok: true, value: user };
} catch (error) {
return { ok: false, error: error as Error };
}
}
import { describe, test, expect, vi } from 'vitest';
describe('UserService', () => {
test('creates user with valid email', async () => {
const service = new UserService(mockRepo);
const user = await service.create('test@example.com');
expect(user.email).toBe('test@example.com');
});
test('throws on invalid email', async () => {
const service = new UserService(mockRepo);
await expect(service.create('invalid')).rejects.toThrow();
});
});
# Biome (linting + formatting)
pnpm add -D @biomejs/biome
pnpm biome check --apply .
# Vitest (testing)
pnpm add -D vitest
pnpm vitest