text: import { root } from '../util/root'
  export function getSymbolObservable (context) {
    let $$observable
    let Symbol = context.Symbol
    if (typeof Symbol === 'function') {
      if (Symbol.observable) {
        $$observable = Symbol.observable
      } else {
        $$observable = Symbol('observable')
        Symbol.observable = $$observable
      }
    } else {
      $$observable = '@@observable'
    }
    return $$observable
  }
  export const observable = getSymbolObservable(root)
  /**
   * @deprecated use observable instead
   */
  export const $$observable = observable
  // # sourceMappingURL=observable.js.map
  