Custom Plugin

import { Storage, StorageProvider } from 'aws-amplify';

export default class MyStorageProvider implements StorageProvider {
    // category and provider name
    static category = 'Storage';
    static providerName = 'MyStorage';

    // you need to implement these seven methods
    // configure your provider
    configure(config: object): object;

    // copy object, optional
    copy?(
	    src: { key: string; identityId: string; level: 'public' | 'protected' | 'private' },
	    dest: { key: string; level: 'public' | 'protected' | 'private' },
	    options?
    ): Promise<any>

    // get object/pre-signed url from storage
    get(key: string, options?): Promise<String|Object>

    // upload storage object
    put(key: string, object, options?): Promise<Object>

    // remove object
    remove(key: string, options?): Promise<any>

    // list objects for the path
    list(path, options?): Promise<any>

    // return 'Storage';
    getCategory(): string;

    // return the name of you provider
    getProviderName(): string;

// add the plugin
Storage.addPluggable(new MyStorageProvider());

// get the plugin
Storage.getPluggable(MyStorageProvider.providerName);

// remove the plugin
Storage.removePluggable(MyStorageProvider.providerName);

// send configuration into Amplify
Storage.configure({
  [MyStorageProvider.providerName]: {
    // My Storage provider configuration
  }
});

class MyStorageProvider implements StorageProvider {
	...
	get(key: string, config: { config1: number; }): Promise<{ key: string }>;
}

// will automatically use the return type from the provider's function signature
const getResult: Promise<{ key: string }> = Storage.get<MyStorageProvider>('key', {
	provider: 'MyStorage',
	config1: 123,
});