I'm trying to grasp the meaning of T = {} within this TypeScript interface. I've searched for documentation on this usage but haven't found anything specific. How does it differ from simply using T?
interface CustomProps<T = {}> {
itemId: string;
id: string;
}
These are known as generic parameter defaults and were first introduced in TypeScript 2.3. More details can be found in the official documentation.
In your specific scenario, this means that if no type parameter is explicitly stated, it will default to {}, often referred to as the empty object type.
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