Front-End Engineering System: CI/CD / Standards / Review / Team Best Practices

Introduction

Should a frontend architect understand engineering? My answer is yes— not to write Jenkinsfiles, but to build the engineering system for “how 50 team members don’t step on the same pitfall”. Three reasons:

1. **“team ESLint + Husky accumulation” is soft skill proof.**Writing 800+ pages of code isn’t strong, being able to make the team stably output 800+ pages of equal quality code is strong.
2. **Engineering is a 10× leverage.**Write good conventions once → 100 PRs automatically apply → save 1000 hours of review.
3. **A team without engineering = chronic death.**After 3 months everyone writes code by their own habits, refactoring costs grow exponentially.

This is post #14 of the Frontend Architecture Cultivation Path series. We skip specific configuration (no talking about every ESLint rule), use architecture diagrams + real data + review checklists to make CI / CD / standards / review / team accumulation concrete. The next post deep-dives into first-screen performance 4.2s→1.8s practical case.

1. CI / CD Pipeline: Modern Front-end Must-Have

Architect’s mantra: each stage should fail-fast— if Lint fails in 1min, don’t run tests.

1.1 GitHub Actions Complete Pipeline

# .github/workflows/ci.yml
name: CI
on:
  pull_request:
    branches: [master]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - run: pnpm install --frozen-lockfile

      - name: Lint
        run: pnpm lint

      - name: Type Check
        run: pnpm typecheck

      - name: Unit Test
        run: pnpm test:unit --reporter=verbose

      - name: E2E Test
        run: pnpm test:e2e

      - name: Build
        run: pnpm build

      - name: Bundle Analysis
        run: pnpm analyze && pnpm report-bundle

Production case: a middle admin backend CI full set takes 8 min (including E2E), all PRs auto-validated before merge.

2. Code Standards: ESLint + Prettier + Stylelint

2.1 Three-Piece Set Division

• ESLint: JS / TS static analysis (unused variables, equals direction)
• Prettier: code formatting (indentation, quotes, trailing commas)
• Stylelint: CSS / SCSS / Less standards

Architect’s rule: Prettier handles format, ESLint handles logic. Responsibilities don’t overlap, when configuring Prettier with ESLint, disable conflicting rules:

// .eslintrc.js
{
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'prettier',  // disable all Prettier-conflicting rules
  ],
  rules: {
    // custom business rules
    'no-console': ['warn', { allow: ['warn', 'error'] }],
    '@typescript-eslint/no-explicit-any': 'error',
  },
}

2.2 Shared Config: eslint-config-{team}

// packages/eslint-config/index.js
module.exports = {
  extends: ['eslint:recommended', 'prettier'],
  rules: {
    'no-console': 'warn',
    'prefer-const': 'error',
  },
};

// Sub-project reuses via extends
// apps/admin/.eslintrc.js
module.exports = {
  extends: ['@team/eslint-config'],
};

Production case: large ERP monorepo uses @finui/eslint-config, all sub-projects share the same standards— add a new rule once, 20 projects take effect simultaneously.

3. Git Hooks: Husky + lint-staged

// package.json
{
  "scripts": {
    "prepare": "husky install"
  },
  "lint-staged": {
    "*.{js,ts,tsx}": ["eslint --fix", "prettier --write"],
    "*.{css,scss}": ["stylelint --fix", "prettier --write"],
    "*.md": "prettier --write"
  }
}

# .husky/pre-commit
pnpm lint-staged
# only lint changed files, don't run full set

Architect’s rule: Husky runs lint-staged, CI runs full set— local quick check, CI fallback.

4. PR Review Checklist (Architect’s View)

Dimension	Review focus
Types / Interfaces	Field types, naming, optional/required consistency
Component design	Reuse / split / props over-design
State management	local / global / server boundaries
Performance	Does it trigger unnecessary re-renders / is large list virtualized
Accessibility	aria-label / keyboard nav / color contrast
i18n	Is text extracted to i18n files
Error handling	try/catch / error boundary / user prompts
Test coverage	Core logic has unit tests
Observability	Is it reported to monitoring / logging
Documentation	README / API change notes

Production rule: architect review sees “system consistency”, business reviewer sees “functional correctness”— division of labor.

5. Team Accumulation Mechanism: Make Standards Inheritable

5.1 Document Decisions (ADR)

# ADR-001: Choose React Query as Data Fetching Solution

## Status
Adopted (2026-07-18)

## Context
Team has 3 data fetching methods: useEffect + fetch / SWR / React Query

## Decision
Whole team uniformly uses React Query.

## Trade-offs
- Pros: cache / invalidation / optimistic updates / Suspense integration
- Cons: bundle size 12KB, 1-week learning curve

## Alternatives
- SWR: similar API, but weaker optimistic updates
- useEffect: zero deps, but need to write cache yourself

5.2 Code Templates + Snippets

# scripts/new-component.sh
#!/bin/bash
COMPONENT_NAME=$1
mkdir -p src/components/$COMPONENT_NAME
cat > src/components/$COMPONENT_NAME/index.tsx <<EOF
import { type FC } from 'react';
import styles from './styles.module.css';

interface ${COMPONENT_NAME}Props {
  // TODO: add props
}

export const ${COMPONENT_NAME}: FC<${COMPONENT_NAME}Props> = (props) => {
  return <div className={styles.root}>${COMPONENT_NAME}</div>;
};
EOF

Architect’s mantra: good engineering = 90% template + 10% decision. Let the team not need to think “how to start this component” each time.

6. Pitfall Reminders (Senior Architects Please Read Carefully)

1. **Don’t run unrelated checks in CI.**Each stage must fail-fast— a PR with 30min CI gets bypassed.
2. **Don’t have too many lint rules.**More than 50 ESLint rules, team gets overwhelmed. Only open rules that block 80% of bugs.
3. **Don’t run full tests in Husky.**Husky only runs lint-staged (single file check), CI runs full tests.
4. **Don’t write standards in Wiki.**Wiki gets forgotten, standards must go in eslint-config packages and ADR docs, install and use.
5. Don’t ignore PR templates..github/PULL_REQUEST_TEMPLATE.md forces developers to fill “why change / how to test”, 3 sentences saves 5 min review.

Summary

Five key facts that thread engineering together:

• CI / CD pipeline: Lint → Type Check → Test → Build → Deploy, each stage fail-fast.
• ESLint + Prettier + Stylelint: format/logic separation, share @team/eslint-config package.
• Husky + lint-staged: local only runs changed files, CI runs full set, division of labor clear.
• PR review checklist: architect sees system consistency, business reviewer sees functional correctness.
• ADR + code templates: decisions inheritable, new components don’t need to start from scratch.

Next post: First-screen performance 4.2s→1.8s practical case — large ERP’s real 4.2s→1.8s optimization, 5-stage time distribution.

5 Key Interview Question Tracks

This section maps one-to-one with the article. Q1 ships with a complete answer as a model; the other four are for you to think through — each one is followed by an AI assistant button for a one-click detailed answer.

Q1 (Answer): What stages should a modern front-end CI / CD pipeline include? Why must each stage fail-fast?

A: 8 standard stages: Lint & Format → TypeScript type check → Unit test → E2E test → Bundle analysis → Build → Preview env → Deploy. Each stage must fail-fast: Lint 1min failure → don’t run tests; unit test 5min failure → don’t run E2E. Principle: fail-fast saves total CI time— a PR with 30min CI gets bypassed, 8min CI gets self-waited. Production case: a middle admin backend CI full set takes 8min, E2E + Bundle analysis run together, all PRs auto-validated before merge.

Q2 (Think): What’s the division of labor between ESLint / Prettier / Stylelint? Why disable conflicting rules when configuring Prettier with ESLint?

Q3 (Think): How do Husky + lint-staged and CI pipeline divide code-check work? Why not run full tests in Husky?

Q4 (Think): What should architects review in PRs? What’s the division of labor with business reviewers?

Q5 (Think): How did you accumulate engineering standards in a 200+ engineer team? How do ADR and code templates help new team members onboard quickly?

💡 Each question has an AI assistant button — one click gets you a detailed answer.

References

• GitHub Actions Documentation — GitHub Actions official documentation
• ESLint Documentation — ESLint official documentation
• Prettier Documentation — Prettier official documentation
• Husky (GitHub) — Husky Git Hooks tool
• Architecture Decision Records (GitHub) — ADR template reference
• Conventional Comments — PR review comment convention