Looking for advice on an anonymous function I've written:
static oneOf(options: any[], cb?: Function) ValidatorFn {
....
}
I'm a TypeScript beginner and unsure how to specify that the 'cb' must return a boolean. Can this be done, and would it affect the parser in any way?
Any guidance on how to accomplish this would be appreciated. Thanks!
Define the signature of your callback using a function signature:
static oneOf(options: any[], cb?: () => boolean ): ValidatorFn { // cb requires no arguments and returns a boolean
....
}
You can also define callback arguments in the signature:
static oneOf(options: any[], cb?: (a: string) => boolean ): ValidatorFn { // cb requires a single string argument and returns a boolean
....
}
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