This excerpt is extracted from line 107 over here. From my understanding, it indicates:
The function either returns a string directly or a function that accepts
ValidationArgumentsas input and then produces a string output.
Given that this is new to me, I just want to confirm if my interpretation is correct?
static getMessage(type: string, isEach: boolean): string|((args: ValidationArguments) => string) {
Absolutely correct, what you're looking at is known as a union type. Union types enable the definition of types that can belong to any of the types within the union. By employing type-guards, it's possible to narrow down the types in a union:
let value : string|((args: ValidationArguments) => string);
if(typeof value === 'string') {
value // is a string
}else{
value(null) // value is a function
}
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