@shopify/shopify-app-express/src/middlewares/types.ts

Shopify Express Middleware - to simplify the building of Shopify Apps with Express

import {RequestHandler} from 'express';

export type ValidateAuthenticatedSessionMiddleware = () => RequestHandler;
export type EnsureInstalledMiddleware = () => RequestHandler;
export type CspHeadersMiddleware = () => RequestHandler;
export type RedirectToShopifyOrAppRootMiddleware = () => RequestHandler;