Functional programming requires data to be immutable. Discover how to leverage TypeScript’s structural typing, Readonly<T>, and as const to enforce deep immutability at compile time, eliminating a massive category of state-based bugs.
An exhaustive analysis of Const Assertions (as const). Learn the 3 transformation rules of const assertions, deep recursive read-only object properties, converting arrays into readonly tuples, and deriving union types dynamically using typeof ARRAY[number].
An exhaustive guide to typing collections in TypeScript. Learn the syntax differences between T[] and Array, union array typing precedence, labeled tuple elements, rest tuples, and why readonly arrays prevent array mutation bugs.
