registerComponent(packageId, name, cPath, callback) {
    const fullName = this.normalizeName(packageId, name);
    this.components[fullName] = cPath;
    if (callback) {
      callback(null);
    }
  }
@param {string} packageId
@param {string} name
@param {ComponentDefinition} cPath
@param {ErrorableCallback} [callback]