Explaining how types interact with arrays

I am looking to create a custom data type in TypeScript that can store an array of functions, where each function takes the output of the previous one as input. For example, a valid instance of this type would look like:

const pipe: SpecialArray = [
    () => string,
    (prev:string) => number,
    (prev:number) => boolean
];

An invalid array would be:

const pipe: SpecialArray = [
    () => string,
    (prev:number) => number, // <-- Here number should be string
    (prev:number) => boolean
];

Can such a structure be defined in TypeScript?

Answer №1

In my opinion, the Array is homogenous which means you have to specify the types in a form like

[(a: string) => number, (b: number) => boolean]
. It's not feasible to enumerate all possibilities unless a code generator is utilized.

Answer №2

In TypeScript, creating a standalone type for this specific array type is not feasible. The recommended approach is to utilize the `compose` function, where you can infer each function from the arguments and validate them accordingly. For more detailed information, you can refer to my article and the related questions/answers on Stack Overflow: first, second, third.

You may also want to explore the implementation of the compose function in the `fnts` library.

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