unfreeze() {
    this._throwWhenIsFinal("Instance is frozen and that can not be undone because it is also final");
    this._isFrozen = false;
    return this;
  }
/**
   * Freezes BEM base so it can be changed again.
   *
   * @return {BemBase}
   */
Freezes BEM base so it can be changed again.
Freezes BEM base so it can be changed again .
unfreeze() {
    this._throwWhenIsFinal("Instance is frozen and that can not be undone because it is also final");
    this._isFrozen = false;
    return this;
  }
unfreeze ( ) { this . _throwWhenIsFinal ( "Instance is frozen and that can not be undone because it is also final" ) ; this . _isFrozen = false ; return this ; }
Freezes BEM base so it can be changed again.
Freezes BEM base so it can be changed again .