src/Viserio/Component/Foundation/BootstrapManager.php
public function addBeforeBootstrapping(string $bootstrapper, callable $callback): void
    {
        $key = 'bootstrapping: ' . \str_replace('\\', '', $bootstrapper);

        $this->bootstrappingCallbacks[$key][] = $callback;
    }
public function addBeforeBootstrapping(string $bootstrapper, callable $callback): void
    {
        $key = 'bootstrapping: ' . \str_replace('\\', '', $bootstrapper);

        $this->bootstrappingCallbacks[$key][] = $callback;
    }
Register a callback to run before a bootstrapper.

@param string   $bootstrapper
@param callable $callback

@return void