Lesson 3.319mIntermediate13k students

Template literal types

String types can be composed and pattern-matched, which lets you type things like event names and route paths precisely.

This lesson sits in Advanced Types, part of TypeScript for Application Developers. It assumes what came before it and leads directly into the next lesson in the module.

In this lesson you will

  • Compose string types from other types
  • Constrain string shapes such as event or route names
  • Combine template literals with key remapping

Pro tip

Template literal types are excellent for typed event names, and a trap when used to parse arbitrary strings.

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