// @flow
import type StyleSheet from './StyleSheet'

declare export default class SheetsManager {
  length: number;
  sheets: WeakMap<
    Object,
    {
      refs: number,
      sheet: StyleSheet
    }
  >;
  size: number;
  get(key: Object): ?StyleSheet;
  add(key: Object, sheet: StyleSheet): void;
  manage(key: Object): ?StyleSheet;
  unmanage(key: Object): void;
}