Is there a concise TypeScript one-liner that can replace the arrayOrMemberToArray function below?
function arrayOrMemberToArray<T>(input: T | T[]): T[] {
if(Arrary.isArray(input)) return input
return [input]
}
Trying to cram this logic into a ternary operator can get messy, especially when chaining with other operations:
const y = (Array.isArray(input) ? input : [input]).map(() => { /* ... */}) // Hard to follow
The use of Array.concat works in the browser console, but TypeScript throws an error:
const x: number | number[] = 0
const y = [].concat(x)
Error:(27, 21) TS2769: No overload matches this call.
Overload 1 of 2, '(...items: ConcatArray<never>[]): never[]', gave the following error.
Argument of type 'number' is not assignable to parameter of type 'ConcatArray<never>'.
Overload 2 of 2, '(...items: ConcatArray<never>[]): never[]', gave the following error.
Argument of type 'number' is not assignable to parameter of type 'ConcatArray<never>'.