Glossary term
What is unknown? Meaning for developers
In Senior Frontend Depth
A safe type for a value you know nothing about. You must narrow or validate it before use. Prefer it to any.
Learn it properly · Senior Frontend DepthLesson 4: Advanced TypeScript for Interviews: Generics, Narrowing, Utility and Conditional TypesGeneric constraints, discriminated unions, infer, mapped types, satisfies, and keeping API response types correct from the server to the UI.In TypeScript From Zero
A safe version of any: you must check the value before using it.
Learn it properly · TypeScript From ZeroLesson 1: Basic Types, Inference and NarrowingPrimitives, unions, literal types, any versus unknown versus never, inference, narrowing and discriminated unions.