Lesson overview · Free interview practice

Compiler

Use the TypeScript Compiler API.

Topics in the full lesson
  • Introduction to the TypeScript Compiler API
  • Setting Up the Environment
  • Understanding the Abstract Syntax Tree (AST)
  • Programmatic AST Manipulation
  • Creating Custom Transformers
  • Applying Transformers during Compilation
  • Practical Examples
  • Best Practices
  • Exercises

Practice Problems

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TheoryMedium

The TypeScript Language Service

Question

What is the TypeScript Language Service, and why does it matter for the developer experience? How is it different from the tsc command?

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Explain your reasoning or try an implementation before comparing answers.

TheoryMedium

Watch Mode and Incremental Compilation

Question

How does TypeScript's watch mode work? What's the difference between watch mode and incremental compilation, and when does each fit?

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Explain your reasoning or try an implementation before comparing answers.

TheoryMedium

Project References for Monorepos

Question

What are TypeScript project references, and what problem do they solve in a monorepo? Show the canonical setup.

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Explain your reasoning or try an implementation before comparing answers.

TheoryMedium

What `tsc` Does: Type-Checking and Transpilation

Question

What are the two main jobs of the TypeScript compiler? Show the canonical tsc workflow and the most commonly used options.

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Explain your reasoning or try an implementation before comparing answers.

TheoryHard

The Compiler API: Building Custom TypeScript Tools

Question

What is the TypeScript Compiler API, and what kinds of tools does it enable? Show the canonical "walk the AST" pattern.

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Explain your reasoning or try an implementation before comparing answers.

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