luhn-generator/update/node_modules/rxjs/src/internal/util/not.ts

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

export function not(pred: Function, thisArg: any): Function {
  function notPred(): any {
    return !((<any> notPred).pred.apply((<any> notPred).thisArg, arguments));
  }
  (<any> notPred).pred = pred;
  (<any> notPred).thisArg = thisArg;
  return notPred;
}