Set typed properties for the Generator class.

[laurentmuller]

It will be nice to set types for the Generator class:

class Generator
{
    /**
     * @var Base[]
     */ 
    protected $providers = [];

    /**
     * @return Base[]
     */ 
    public function getProviders()
    {
        // ...
    }

    public function addProvider(Base $provider)
    {
        // ...
    }

[stale]

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