set code(newCode) {
    const strNewCode = String(newCode);
    if (strNewCode === this._prefix + this._code + this._suffix) return;
    this._code = strNewCode;
    this._prefix = '';
    this._suffix = '';
    this._compiledVM = null;
    this._compiledNodeVM = null;
  }
For backwards compatibility.
Will invalidate the code cache.

@param {String} newCode The new code to run.