Q55: What are Recursive Type Aliases and how do you construct deeply nested JSON types?
A Recursive Type Alias references itself within its own type definition. Useful for hierarchical data structures like tree structures, AST nodes, or JSON payloads.
Type-Safe JSON Value Definition
type JSONValue =
| string
| number
| boolean
| null
| JSONValue[]
| { [key: string]: JSONValue };💡 Recursively references JSONValue to type-check arbitrarily nested JSON structures.
Key Takeaways
- Used to model recursive tree structures like JSON payloads.