Unleashing the const Type Parameters
Explore the concept of const type parameters introduced in TypeScript 5.0 to declare immutable values at function call time. Understand how this feature enhances type safety by removing the need for repetitive as const declarations and allows more precise type inference for readonly data structures.
We'll cover the following...
Introduction to the const type parameter
The const type parameters allow us to declare values with const. TypeScript can now infer the type, not just the literal values.
The const type parameters allow us to clearly state our intentions in our code. If a variable is supposed to be a constant that never changes, the const type parameters give us a safety net, ensuring it stays constant, come what may.
Previous versions of TypeScript have supported using as const to declare an object or array as readonly. Once TypeScript knows that an object or array isn’t ...