Tips for creating a versatile key pair in TypeScript with a generic "type"

I need to create a key value pair type for flat objects, but I keep encountering an error when using it in a global s type file.

// 1. currently using this
type KEY_VALUES = { [k: string | number]: any; };

// 2. I thought it should be like this
type KEY_VALUES = { [k: string | number]: [value: any]; };

1. Error: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.

2. Error: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.

What is the recommended approach to resolve this issue?

typescripttypescript-generics

Answer №1

You might want to consider utilizing a mapped object type.

Have you experimented with that approach?

type KEY_VALUES = {
    [key in string | number]: any;
};

Answer №2

In addition to @SeanAH's suggestion, another approach is utilizing string pattern index signatures:


type KEY_VALUES = { [k: string | `${number}`]: [value: any]; };

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