Exploration and Practice of Frontend Engineering

This article explores frontend engineering practices and implementation, based on two real-world projects: mobile-end basic library reconstruction and UI component library development.

Frontend Engineering Lifecycle: The lifecycle consists of four processes: development, testing, deployment, and maintenance. Engineering refers to systematic, strictly constrained, and quantifiable methods applied throughout these processes.

Modularization: Covers JS modularization (CommonJS, AMD, CMD, UMD, ES6 Module) and CSS modularization (preprocessors like LESS/SASS/Stylus, OOCSS, SMACSS, BEM, CSS in JS, CSS Module). Each approach has its advantages and trade-offs in terms of scope isolation, maintainability, and build optimization.

Componentization: Discusses modern frameworks (React, Vue, Angular) and Web Component standards (Custom Element, Shadow DOM, HTML Template & Slots). React breaks the traditional "separation of concerns" principle by organizing code around components.

Standardization: Includes code standards (ESLint, Prettier, husky, lint-staged), type checking (PropTypes, Flow, TypeScript), documentation tools (JSDoc, Storybook, react-styleguidist), and workflow standards (github-flow, git-flow, gitlab-flow).

Automation: Covers build tools (code transformation, module merging, tree shaking), testing (unit, integration, system, acceptance testing), and CI/CD pipelines.

Practical Implementation: The team migrated from IIFE pattern to ES6 Module, adopted Rollupjs for building, CSS Module for styling, Jest for testing, and integrated CI with automated linting and testing.