The function designed to accept a list of GenericType does not support the arguments provided

I am struggling with implementing a function that can handle a list of generic types, but for some reason, it's not accepting the arguments as expected.

interface TheInterface<T extends string> {
    theRecord: Record<T, unknown>
}

const theFunction = <T extends string>(...arrayOfInterfaceType:TheInterface<T>[]) => {


return (key: keyof typeof arrayOfInterfaceType[number]['theRecord']) => key

}

const values1 = {theRecord:{value1: ""}}

const values2 = {theRecord:{value2: ""}}

const values1TheInterface: TheInterface<keyof typeof values1.theRecord> = values1

const values2TheInterface: TheInterface<keyof typeof values2.theRecord> = values2


//Works perfectly
const functionWithOneInterface = theFunction(values1TheInterface)
//Intelisense works for key
functionWithOneInterface("value1")
//Does not work
const functionWithTwoInterfaces = theFunction(values1TheInterface, values2TheInterface)
//Intellisense only works for value1
functionWithTwoInterfaces("value1", "value2")

The code snippet above is simplified but represents the same issue encountered in the actual code.

Link to Playground for testing

Answer №1

The compiler's heuristics restrict the use of multiple different string literals for T in this scenario. Once the type T is inferred from the first element, all other elements must conform to the same T.

You may be looking for something like the following:

const theFunction = <T extends TheInterface<any>[]>(
  ...arrayOfInterfaceType: [...T]
) => {
  return (...keys: { [K in keyof T]: keyof T[K]["theRecord"] }) => keys;
};

Instead of using T solely for storing keys, consider allowing it to store the entire array. Additionally, utilize spread syntax [...T] to preserve the order of elements.

The returned function seems to be callable as a rest parameter. We map over T for typing purposes and extract key values for each element T[K].


Interactive Playground

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