Introduction to ASTs: Code Transformation and Custom Linting

Have you ever wondered how tools like ESLint, Babel, or Prettier analyze and transform your code? Understanding Abstract Syntax Trees (ASTs) is the key to unlocking the inner workings of modern development tooling. This text-based course guides you from the fundamental concepts of syntax trees to writing your own custom linting rules and automated code transformation scripts. You will gain a deep understanding of how code is parsed, traversed, and modified. What you'll learn: - Understand the core structure and lifecycle of an Abstract Syntax Tree (AST) - Parse JavaScript and TypeScript code into readable tree structures - Build custom linting rules to enforce team-specific coding standards - Transform existing codebases automatically using AST traversal and modification - Apply AST concepts using modern tools like ESLint and Babel-compatible parsers - Practice writing robust node selectors and visitors to safely target specific code patterns We begin with key terminology, basic concepts, and foundational definitions of parsers and compilers. From there, you will explore step-by-step written explanations and code walkthroughs that demonstrate how to traverse and manipulate syntax nodes safely. This course is designed for JavaScript and TypeScript developers who are beginners to compiler concepts and ASTs. No prior experience with compiler design or tool-building is required. Start reading today to master the machinery behind your favorite development tools.