TypeScript type for nested arrays of functions

Question

I have a terrible data structure that is causing TypeScript to freak out.

let foo = {
    'baz':[
        [[x1, x2, x3], (a: any, b: number, c: number) => 5],
        [[x4], (a: number) => 7]],
    'bar':[
        [[], () => 0]]
}

x1, x2... are all (s: string) => number | string functions. I'm struggling to explicitly define foo's type. In Java-esque terms, it would be

Map<String, List<Tuple<List<Function<String,Any>>, Function<Any...,Integer>>>>

A list of lists, where the inner list has a list of functions and a function. As an aside, the number of elements in the list of functions will always equal the number of parameters in the anonymous function. The TypeScript compiler recommends:

 Record<string, (any[] | ((...args: any) => number))[][]>

However, when I attempt to call foo['baz'][0][0][2](myString), to call x3(myString), the compiler yells

TS7053: Element implicitly has an 'any' type because expression of type 'number' can't be used 
to index type 'any[] | ((...args: any) => number)'.   No index signature with a parameter of 
type 'number' was found on type 'any[] | ((...args: any) => number)'.

Michael Bianconi · Accepted Answer · 2020-12-17 02:55:39Z

1

Record<string, [((operand: string) => (string | number))[], ((...v: any[]) => number)][]>

I found it.

answered Dec 17, 2020 at 2:55

Michael Bianconi

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