Typescript terms
JavaScript with a safety net and a much better IDE experience
TypeScript adds a powerful static type system to JavaScript, catching errors at compile time and making large codebases dramatically easier to maintain and refactor. This category covers type primitives, generics, utility types, declaration files, strict mode, and the patterns that make TypeScript an upgrade rather than just added ceremony.
Covariance & Contravariance 4.7 Variance describes how subtype relationships on a type's components affect subtype relationships on the whole type — covariant types follow the direction, contravariant types reverse it.
4w ago
typescript advanced
const Type Parameters (TS 5.0) 5.0
TypeScript 5.0 const type parameters infer literal types instead of widened types — const T extends string[] infers ['a','b'] not string[].
2mo ago
typescript intermediate
Conditional Types & infer 2.8
Types that choose between two types based on a condition — T extends U ? X : Y — enabling type-level branching. The infer keyword extracts types from within a conditional.
2mo ago
typescript advanced