解决升级 laravel 背包的依赖冲突

Question

我正在尝试将 laravel backpack 升级到 v3.4.0 指导this document.

当前这个 laravel 版本是 5.7.x.（是的，它确实是过时的项目）。

在第9步说运行

php artisan backpack:base:install

，当运行这个命令时会出现这个错误：

The command "composer require laracasts/generators:dev-master --dev" failed.           
                                                                                         
  Exit Code: 2(Misuse of shell builtins)                                                 
                                                                                         
  Working directory: /home/user/php/laravel/                             
                                                                                         
  Output:                                                                                
  ================                                                                       
                                                                                         
                                                                                         
  Error Output:                                                                          
  ================                                                                       
  ./composer.json has been updated                                                       
  Running composer update laracasts/generators                                           
  Loading composer repositories with package information                                 
  Updating dependencies                                                                  
  Your requirements could not be resolved to an installable set of packages.             
                                                                                         
    Problem 1                                                                            
      - Root composer.json requires laracasts/generators dev-master -> satisfiable by l  
  aracasts/generators[dev-master].                                                       
      - laracasts/generators dev-master requires illuminate/support ~6.0|~7.0|~8.0|~9.0  
  |^10.0 -> found illuminate/support[v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.  
  0, ..., v8.83.27, v9.0.0, ..., v9.52.7, v10.0.0, ..., v10.9.0] but these were not loa  
  ded, likely because it conflicts with another require.                                 
                                                                                         
  Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removal  
  s for packages currently locked to specific versions.                                  
                                                                                         
  Installation failed, reverting ./composer.json and ./composer.lock to their original   
  content.

总而言之，laracasts/generators 依赖于未加载的 illuminate/support v6.0.0 - v10.9.0。

我该如何解决这个冲突？

如错误所述：我尝试使用

-W

选项运行此命令，即：

composer require laracasts/generators:dev-master --dev -W

并且发生了同样的错误：

- Root composer.json requires laracasts/generators dev-master -> satisfiable by laracasts/generators[dev-master].
    - laracasts/generators dev-master requires illuminate/support ~6.0|~7.0|~8.0|~9.0|^10.0 -> found illuminate/support[v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27, v9.0.0, ..., v9.52.7, v10.0.0, ..., v10.9.0] but these were not loaded, likely because it conflicts with another require.
`