Function isNumber

cli/parse_args.ts:438–440

(string: string)

const NON_WHITESPACE_REGEXP = /\S/;

function isNumber(string: string): boolean {
  return NON_WHITESPACE_REGEXP.test(string) && Number.isFinite(Number(string));
}

function isConstructorOrProto(obj: NestedMapping, key: string): boolean {
  return (key === "constructor" && typeof obj[key] === "function") ||