uppy/ARCHITECTURE.md

Transloadit JavaScript SDK architecture

Core

1. The core function thansloadit accepts options and exposes methods like .use for adding plugins and .set for setting options.
2. Each plugin is then called by the use with given options as an argument.
3. The result is passed from the plugin to prepareMedia for some final processing
4. Then the processed files go into upload which uploads everything to Transloadit servers, using tus.

Plugins

1. Plugins should be registered like this:

   transloadit.use(dragndrop, {
   selector: '.drop'
   });
   

   *For reference, see [Markdown-It](https://github.com/markdown-it/markdown-it/blob/master/lib/index.js#L459).*
   
   2. Settings and handlers should be chainable and set like this:
   ```javascript
   transloadit
   .set({ wait: true })
   .use(transloaditModal, {some: 'config'})
   .use(dragdrop, {target: transloaditModal})
   .use(instagram, {some: 'config'})
   .on('progress', handleProgress)
   .on('error', handleError);
   

2. In transloadit-js everything is a plugin: a Modal dialog, Drag & Drop, Instagram. We borrow general approach from the new Babel and PostCSS — almost barebones by default, each chunk of functionality exists as separate plugin — easier to pick and choose exactly what you need to get a lightweight solution for production, while also easier to develop and avoid merge conflicts.

3. Presets should exist with basic plugins like Modal & Drag & Drop. This should let people who just want to get it working as quickly as possible get started in seconds:

   transloadit
     .set({ wait: true })
     .use(transloaditBasic, {some: 'config'})
   

   See es2015-preset for Babel and PreCSS for PostCSS.

   or just make it a code sample for easy copy/pasting and future customizations (no need to change the main function call, just add/remove lines to modify behaviour):

   transloadit
     .set({ wait: true })
     .use(transloaditModal, {some: 'config'})
     .use(dragdrop, {target: transloaditModal})
   

4. Users should be able to set themes and style settings in config: .use(myTheme).

5. Would be cool if you could use whatever drag & drop library you wanted (DropZone) with our wrapper.

Usage

import transloadit   from 'transloadit';
import dragndrop     from 'transloadit-dragndrop';
import instagram     from 'transloadit-instagram';
import modal         from 'transloadit-modal';

// import Transloadit from 'transloadit-client'
// import { dropbox, instagram, dragdrop, webcam } from 'transloadit-client/plugins'

// or to import all of them
// import { * as plugins } from 'transloadit/plugins'

transloadit
  .set({ wait: true })
  .use(modal, {some: 'config'})
  .use(dragdrop, {target: transloaditModal})
  .use(instagram, {some: 'config'})
  .on('progress', handleProgress)
  .on('error', handleError)
  .on('done', handleResult);

References & Inspiration

1. PostCSS
2. Markdown-It
3. Babel
4. Lodash