src/Composer/Installer.php
public function setOptimizeAutoloader($optimizeAutoloader = false)
    {
        $this->optimizeAutoloader = (bool) $optimizeAutoloader;
        if (!$this->optimizeAutoloader) {
            // Force classMapAuthoritative off when not optimizing the
            // autoloader
            $this->setClassMapAuthoritative(false);
        }

        return $this;
    }
public function setOptimizeAutoloader($optimizeAutoloader = false)
    {
        $this->optimizeAutoloader = (bool) $optimizeAutoloader;
        if (!$this->optimizeAutoloader) {
            // Force classMapAuthoritative off when not optimizing the
            // autoloader
            $this->setClassMapAuthoritative(false);
        }

        return $this;
    }
Whether or not generated autoloader are optimized

@param  bool      $optimizeAutoloader
@return Installer