Development is indeed difficult.

[iluozhiqiang]

Medusajs version: 2.0
I hope that existing modules can inherit and rewrite some functions.

Now many module designs seem to be decoupled, but in fact they are very difficult to expand. We cannot replace any existing programs inside.

For example:
I need to modify the S3 upload logic to implement some of my own functions, such as compression, and anything else I want to do.
The methods I know are:

1. Completely rewrite the file upload module
2. Through workflow. There are no hooks for file upload.
3. Through events. There are no events for file workflow.

class CompressProviderService extends S3FileProviderService {
    // TODO implement methods

    async upload(file: ProviderUploadFileDTO): Promise<ProviderFileResultDTO> {
        //compressing ...
        if (file.mimeType.indexOf('image')) {
            // file = await this.compress(file);
        }
        return super.upload(file)
    }
}

When I need to modify the product editing page, I encounter new challenges.
For example:
When I need to perform batch operations on variants, I find that the variant table cannot be replaced. The design of medusajs only expands some key functions, but cannot replace the existing page logic. I can only make a new page for patching.