Function lengthReviver

deps/v8/test/mjsunit/harmony/json-parse-with-source.js:110–114

(key, value, context)

})();

function lengthReviver(key, value, context) {
  if (key == '') return value;
  if (context === undefined) return 'undefined';
  return context.source.length;
}

(function TestContext() {
  const stringify = JSON.stringify;