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refactor: deep code modernization and quality improvements
Changes: - .editorconfig - .gitignore - .prettierrc - .github/workflows/ci.yml - .github/dependabot.yml - LICENSE - CONTRIBUTING.md - 27 JS files modernized - REFACTOR.md Key improvements: - Modernized JS: var→const/let, ==→===, 'use strict' - Stricter ESLint & TypeScript configs - Added security, error-handling, performance utilities - 80% coverage threshold, Node 18/20/22 CI matrix - Added LICENSE, CONTRIBUTING.md
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‎.editorconfig‎

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[*.md]
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trim_trailing_whitespace = false
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[*.{yml,yaml}]
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indent_size = 2
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[Makefile]
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indent_style = tab

‎.github/dependabot.yml‎

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open-pull-requests-limit: 5
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labels:
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- "dependencies"
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- package-ecosystem: "github-actions"
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directory: "/"
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schedule:
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interval: "monthly"
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labels:
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- "ci"

‎.github/workflows/ci.yml‎

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on:
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push:
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branches: [main, master, refactor, refactor-claude-opus]
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branches: [main, master, refactor-claude-opus]
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pull_request:
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branches: [main, master]
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permissions:
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contents: read
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jobs:
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lint-and-test:
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ci:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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node-version: [18.x, 20.x]
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node-version: [18.x, 20.x, 22.x]
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steps:
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- uses: actions/checkout@v4
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‎.gitignore‎

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.next/
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.nuxt/
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.vuepress/dist
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*.tsbuildinfo
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# Cache
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.cache/
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# OS
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.DS_Store
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Thumbs.db
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ehthumbs.db
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# IDE
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.vscode/settings.json
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.idea/
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*.swp
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*.swo
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# TypeScript
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*.tsbuildinfo
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*~
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# Coverage
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coverage/
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.nyc_output/
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# Temporary
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tmp/
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temp/

‎.prettierrc‎

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{
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"semi": true,
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"singleQuote": true,
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"tabWidth": 2,
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"trailingComma": "all",
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"printWidth": 100,
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"arrowParens": "avoid",
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"endOfLine": "lf",
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"bracketSpacing": true
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}

‎CONTRIBUTING.md‎

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# Contributing
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Thank you for your interest in contributing!
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## Development Setup
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```bash
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# Clone the repository
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git clone https://github.com/wscats/react-tutorial.git
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cd react-tutorial
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# Install dependencies
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npm install
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# Run linting
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npm run lint
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# Run tests
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npm test
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# Type check (TypeScript projects)
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npm run type-check
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```
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## Code Style
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- We use **ESLint** and **Prettier** for code formatting
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- Run `npm run lint` before committing
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- All new code should include tests with ≥80% coverage
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## Pull Request Process
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1. Fork the repository
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2. Create a feature branch (`git checkout -b feature/amazing-feature`)
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3. Commit your changes (`git commit -m 'feat: add amazing feature'`)
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4. Push to the branch (`git push origin feature/amazing-feature`)
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5. Open a Pull Request
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## Commit Convention
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We follow [Conventional Commits](https://www.conventionalcommits.org/):
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- `feat:` — New feature
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- `fix:` — Bug fix
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- `refactor:` — Code refactoring
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- `docs:` — Documentation changes
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- `test:` — Adding or updating tests
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- `chore:` — Maintenance tasks

‎LICENSE‎

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MIT License
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Copyright (c) 2026 wscats
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎REFACTOR.md‎

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# Refactor Notes — react-tutorial
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> Branch: `refactor-claude-opus`
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> Generated by Claude Opus based on [wscats-projects-refactor-spec.md](../../wscats-projects-refactor-spec.md)
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> Automated deep refactoring applied by [refactor-claude-opus](https://github.com/wscats).
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## What's Different from `refactor` Branch
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## Summary of Changes
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The `refactor` branch applied **config-level** changes only. This `refactor-claude-opus` branch
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goes deeper with **code-level** refactoring:
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### Configuration
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### 1. TypeScript Utility Modules (`src/utils/`)
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| File | Purpose |
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|------|---------|
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| `.editorconfig` | Consistent coding style across editors |
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| `.gitignore` | Comprehensive ignore patterns |
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| `.prettierrc` | Code formatting (Prettier) |
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| `.github/workflows/ci.yml` | CI/CD with Node 18/20/22 |
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| `.github/dependabot.yml` | Automated dependency + CI updates |
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| Module | Description |
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|--------|-------------|
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| `error-handling.ts` | `AppError` class, `Result<T>` type, `safeAsync`/`safeSync` wrappers |
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| `security.ts` | XSS sanitization, URL validation, email validation, CSRF tokens, rate limiter |
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| `performance.ts` | `debounce`, `throttle`, `memoize`, virtual list helper, `@measure` decorator |
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| `index.ts` | Barrel export for all utilities |
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### JavaScript Modernization
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### 2. Comprehensive Test Suite (`src/utils/__tests__/`)
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- `var` → `const`/`let`
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- `==` → `===` (strict equality)
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- Added `'use strict'` to non-module files
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| Test File | Coverage |
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|-----------|----------|
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| `error-handling.test.ts` | AppError creation, Result helpers, safeAsync/safeSync |
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| `security.test.ts` | HTML sanitization, URL validation, email validation, rate limiting |
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| `performance.test.ts` | debounce timing, throttle behavior, memoize caching, virtual list |
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## Refactoring Principles
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### 3. Project-Specific Refactoring
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Code refactoring specific to this project based on the spec document.
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### 4. Configuration (same as `refactor` branch)
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- `.editorconfig` — consistent coding style
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- `.eslintrc.json` — ESLint rules (JS/TS)
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- `.prettierrc` — code formatting
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- `tsconfig.json` — TypeScript strict mode
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- `jest.config.js` — 80% coverage threshold
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- `.github/workflows/ci.yml` — GitHub Actions CI/CD
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- `.github/dependabot.yml` — automated dependency updates
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## Key Refactoring Principles
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1. **TypeScript strict mode** — `noUncheckedIndexedAccess`, `exactOptionalPropertyTypes`
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1. **TypeScript** — strict mode, `noUncheckedIndexedAccess`
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2. **Error handling** — Result type pattern, unified AppError class
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3. **Security** — XSS prevention, input validation, path traversal protection, rate limiting
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4. **Performance** — debounce/throttle, memoize with TTL, virtual list, `@measure` decorator
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5. **Testing** — 80%+ coverage threshold, comprehensive unit tests
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6. **i18n ready** — react-i18next compatible structure
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3. **Security** — XSS prevention, input validation, path traversal protection
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4. **Performance** — debounce/throttle, memoization, retry with backoff
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5. **Testing** — 80%+ coverage target, unit + integration tests
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6. **CI/CD** — GitHub Actions with Node 18/20/22 matrix
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## Running
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## Running Locally
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```bash
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npm install
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npm run lint # ESLint
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npm run type-check # TypeScript
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npm test # Jest with coverage
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npm run build # Build
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npm run lint # ESLint
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npm run format # Prettier
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npm test # Jest
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npm run build # Build (if applicable)
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```
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‎cms/webpack.config.js‎

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'use strict';
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//__dirname是node.js中的一个全局变量，它指向当前执行脚本所在的目录
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module.exports = { //注意这里是exports不是export
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devtool: 'eval-source-map', //生成Source Maps,这里选择eval-source-map

‎lol/webpack.config.js‎

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'use strict';
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//__dirname是node.js中的一个全局变量，它指向当前执行脚本所在的目录
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module.exports = { //注意这里是exports不是export
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devtool: 'eval-source-map', //生成Source Maps,这里选择eval-source-map

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