Function isIdentifier

lib/internal/repl/completion.js:86–105

(str)

);

function isIdentifier(str) {
  if (str === '') {
    return false;
  }
  const first = StringPrototypeCodePointAt(str, 0);
  if (!isIdentifierStart(first)) {
    return false;
  }
  const firstLen = first > 0xffff ? 2 : 1;
  for (let i = firstLen; i < str.length; i += 1) {
    const cp = StringPrototypeCodePointAt(str, i);
    if (!isIdentifierChar(cp)) {
      return false;
    }
    if (cp > 0xffff) {
      i += 1;
    }
  }
  return true;
}

function isNotLegacyObjectPrototypeMethod(str) {
  return isIdentifier(str) &&