Automatically deduce data type within interface

Here is the code snippet I am working with:

interface Model<T extends Type> {
  type: T
  get?: (value: ToNodeType<T>) => any
}

I am expecting that the parameter type of 'get' will be inferred automatically from the 'type' attribute.

const model: Model = {
  type: 'int',
  get: (v) => 0
}

However, I am encountering an error message saying:

Generic type 'Model ' requires 1 type argument(s).

Answer №1

interface Product<P extends Brand> {
  brand: P
  retrieve?: (data: ToBrandType<P>) => any
}

function createProduct<P extends Brand>(product: Product<P>): Product<P> {
  return product;
}

const product = createProduct({
  brand: 'Nike',
  retrieve: (d) => console.log('Retrieving data for Nike')
})

product;
// ^? const product: Product<'Nike'>


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