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> TypeScript Tooling

Development tools, linting, and build config for TypeScript. Use when configuring ESLint, Prettier, Jest, Vitest, tsconfig, or any TS build tooling.

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SKILL.md•TypeScript Tooling

TypeScript Tooling

Priority: P1 (OPERATIONAL)

Essential tooling for TypeScript development and maintenance.

Implementation Guidelines

  • Compiler: tsc for CI. ts-node/esbuild for dev.
  • Lint: ESLint + @typescript-eslint. Strict type checking.
  • Format: Prettier (on save + commit).
  • Test: Jest/Vitest > 80% coverage.
  • Build: tsup (libs), Vite/Webpack (apps).
  • Check: tsc --noEmit in CI.

Anti-Patterns

  • No Disable: Avoid // eslint-disable.
  • No Skip: Avoid skipLibCheck: true if possible.
  • No Ignore: Use @ts-expect-error > @ts-ignore.

ESLint Configuration

Strict Mode Requirement

CRITICAL: Every file in the project, including tests (.spec.ts), must adhere to strict type-checked rules. NEVER turn off @typescript-eslint/no-explicit-any or no-unsafe-* rules.

Common Linting Issues & Solutions

Request Object Typing

Problem: Using any for Express request objects or creating duplicate inline interfaces. Solution: Use the centralized interfaces in src/common/interfaces/request.interface.ts.

import { RequestWithUser } from 'src/common/interfaces/request.interface';

Unused Parameters

Problem: Function parameters marked as unused by linter. Solution: Prefix the parameter with an underscore (e.g., _data) or remove it. NEVER use eslint-disable.

Test Mock Typing

Problem: Jest mocks triggering unsafe type warnings when expect.any() or custom mocks are used. Solution: Cast the mock or expectation using as unknown as TargetType.

mockRepo.save.mockResolvedValue(result as unknown as User);

Configuration

// tsconfig.json
{
  "compilerOptions": {
    "strict": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true
  }
}

Reference & Examples

For testing configuration and CI/CD setup: See references/REFERENCE.md.

Related Topics

best-practices | language

> related_skills --same-repo

> typescript-tooling

Development tools, linting, and build config for TypeScript. Use when configuring ESLint, Prettier, Jest, Vitest, tsconfig, or any TS build tooling. (triggers: tsconfig.json, .eslintrc.*, jest.config.*, package.json, eslint, prettier, jest, vitest, build, compile, lint)

> typescript-security

Secure coding practices for TypeScript. Use when validating input, handling auth tokens, sanitizing data, or managing secrets and sensitive configuration. (triggers: **/*.ts, **/*.tsx, validate, sanitize, xss, injection, auth, password, secret, token)

> typescript-language

Modern TypeScript standards for type safety and maintainability. Use when working with types, interfaces, generics, enums, unions, or tsconfig settings. (triggers: **/*.ts, **/*.tsx, tsconfig.json, type, interface, generic, enum, union, intersection, readonly, const, namespace)

> typescript-best-practices

Idiomatic TypeScript patterns for clean, maintainable code. Use when writing or refactoring TypeScript classes, functions, modules, or async logic. (triggers: **/*.ts, **/*.tsx, class, function, module, import, export, async, promise)

┌ stats

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github stars341
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first seenMar 17, 2026
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┌ repo

HoangNguyen0403/agent-skills-standard
by HoangNguyen0403
└────────────

┌ tags

#testing#typescript#unit-testing
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