Local images not deleted after upload

Maybe my logic behind this is wrong but imager is not working like "I would like to". So all my assets are setup with an S3 bucket, now I wanted to optimize all uploaded images and also upload to S3.

I saw there were some issues with this but for me it worked without a problem.

Here is my config:

return [
//    'optimizeType' => 'runtime', //  If set to 'runtime', all optimizations will be run immediately.
    'useCwebp' => true,
    'resizeFilter' => 'hermite',
    'storageConfig' => [
        'aws'  => [
            'accessKey' => getenv('S3_API_KEY'),
            'secretAccessKey' => getenv('S3_SECRET'),
            'region' => getenv('S3_REGION'),
            'bucket' => getenv('S3_BUCKET'),
            'folder' => '',
            'requestHeaders' => array(),
            'storageType' => 'standard',
            'cloudfrontInvalidateEnabled' => false,
            'cloudfrontDistributionId' => '',
        ],
    ],
    'storages' => ['aws'],
    'imagerUrl' => 'https://s3.amazonaws.com/' . getenv('S3_BUCKET') . '/',
    'cacheRemoteFiles' => false,
    'cacheEnabled' => false,
    'cacheDurationRemoteFiles' => 0,
    'cacheDuration' => 0,
    'cacheDurationExternalStorage' => 0,
    'optimizerConfig' => [
        'jpegoptim' => [
            'extensions' => ['jpg'],
            'path' => '/usr/bin/jpegoptim',
            'optionString' => '-s',
        ],
        'optipng' => [
            'extensions' => ['png'],
            'path' => '/usr/bin/optipng',
            'optionString' => '-o2',
        ],
        'gifsicle' => [
            'extensions' => ['gif'],
            'path' => '/usr/bin/gifsicle',
            'optionString' => '--optimize=3 --colors 256',
        ],
    ],
    'optimizers' => ['jpegoptim', 'gifsicle', 'optipng'],

];

What is the problem? The problem with this is that Imager is storing the images locally. I know it needs to download the images (because they are remote) before transforming them, but why doesn't it delete after the transformation. For this reason I tried to disable "cache":

    'cacheRemoteFiles' => false,
    'cacheEnabled' => false,
    'cacheDurationRemoteFiles' => 0,
    'cacheDuration' => 0,
    'cacheDurationExternalStorage' => 0,

How I imagined it working is:

Check if image transformation exists (remote or local)
If not get normal image (download if remote)
Transform image
Upload (remote) or Save (if local)
If remote clean the local copy.

I really didn't have time to dig to deep in the code but from what I see here:

https://github.com/aelvan/Imager-Craft/blob/b8f9af372dc9fb60d778cdc1a00a6b7026bf0986/src/transformers/CraftTransformer.php#L196-L198

Imager needs a local copy? Correct me if I am wrong.

Why am I asking this? The whole (one of) idea of us using S3 was to offload the storage to AWS and not fill up the server. If imager works like this (or I didn't configure it right), we will fill up the local server and S3 will work ONLY as CDN.

Why is this a problem? Because we deploy on Heroku and upload changes are not persistent and will be cleaned out, therefore making this useless.

aelvan / Imager-Craft

Local images not deleted after upload #240