Getting Started with JavaScript Linter | What Is Linter?
summary
Explains how to add and configure ESLint (npm install eslint as a devDependency), how it tokenizes code into abstract syntax tree tokens, and how rules detect syntax, style, security and performance problems so fewer bugs and flaky Playwright tests reach CI. Shows using an ESLint plugin for Playwright to flag hardcoded waits, using pre-commit hooks or “on save” to reduce distractions, and writing a custom rule (example: enforce camelCase) published to npm or a private registry. Warns that adding linting to mature code needs significant refactoring and good test coverage.
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chapters (7)
- 0:00Introduction to linters
- 0:49How linters work
- 2:57Configuring linter behavior
- 4:45Setting up ESLint
- 6:09Enforcing rules across projects
- 8:18Understanding AST in linters
- 12:21Resources and tips
