code: public function setAliases($aliases)
      {
          foreach ($aliases as $name => $alias) {
              Yii::setAlias($name, $alias);
          }
      }
docs: Defines path aliases.
  This method calls [[Yii::setAlias()]] to register the path aliases.
  This method is provided so that you can define path aliases when configuring a module.
  @property array list of path aliases to be defined. The array keys are alias names
  (must start with `@`) and the array values are the corresponding paths or aliases.
  See [[setAliases()]] for an example.
  @param array $aliases list of path aliases to be defined. The array keys are alias names
  (must start with `@`) and the array values are the corresponding paths or aliases.
  For example,
  
  ```php
  [
  '@models' => '@app/models', // an existing alias
  '@backend' => __DIR__ . '/../backend',  // a directory
  ]
  ```