react-json-tree/src/objType.ts

React JSON Viewer Component, Extracted from redux-devtools

export default function objType(obj: any) {
  const type = Object.prototype.toString.call(obj).slice(8, -1);
  if (type === 'Object' && typeof obj[Symbol.iterator] === 'function') {
    return 'Iterable';
  }

  if (
    type === 'Custom' &&
    obj.constructor !== Object &&
    obj instanceof Object
  ) {
    // For projects implementing objects overriding `.prototype[Symbol.toStringTag]`
    return 'Object';
  }

  return type;
}