Method _toString

src/expression/node/Node.js:260–263

* Internal function to generate the string output. * This has to be implemented by every Node * * @throws {Error}

()

     * @throws {Error}
     */
    _toString () {
      // must be implemented by each of the Node implementations
      throw new Error('_toString not implemented for ' + this.type)
    }

    /**
     * Get a JSON representation of the node