Can you explain the variance between the (Record<string, unknown>) and object type?

Can you explain the distinction between type Record<string, unkown> and type object?

Create a generic DeepReadonly<T> which ensures that every parameter of an object - and its nested objects recursively - is readonly.

Here's the type I came up with:

type DeepReadonly<T> = T extends object ? {readonly:[K in keyof T]:DeepReadonly<T[K]>}:T

However, it seems to have a flaw. When I replaced object with Record<string,unkown>, the 'DeepReadonly' function worked correctly. So, what is the difference? Could it be that object allows for an empty declaration, whereas Record<string,unkown> requires specific key-value pairs?

typescripttypescript-typings

Answer №1

When we use the object type in programming, we are actually referring to a Reference Type, which can include arrays, functions, and object literals. The term Record<> specifically points to object literals in this context.

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