Attempting to assign an empty object as the default value for a parameter of type Record is not valid

interface CustomObject = Record<string, any>
<T extends CustomObject>(argument: T = {}) => argument
                         ^^^^^^^^^^^^^ 

TS2322: The type '{}' cannot be assigned to 'T'.   '{}' can be assigned to the constraint of type 'T', but a different subtype of constraint 'Record<string, any>' could be instantiated with 'T'

Answer №1

The structure of T is unknown to TypeScript, so you must explicitly state that you understand {} represents T as shown below:

Explore TypeScript Playground example

type SimpleObject = Record<string, any>
<T extends SimpleObject>(param: T = {} as T) => param

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