Middleware function for Enhance.dev

applyMiddleware.mjs

/**                                                                                              
 * applyMiddleware takes an array of middleware functions and returns a decorator that will apply
 * the middleware functions in reverse order around the target function.                         
 *                                                                                               
 * Example                                                                                       
 *                                                                                               
 *   const handleGet = async(req) => ({ ... })                                                
 *   const mw1 = (next) => async (req) => await next(req) + "  mw1"                        
 *   const mw2 = (next) => async (req) => await next(req) + "  mw2"                        
 *   const mw3 = (next) => async (req) => await next(req) + "  mw3"                        
 *   export const get = applyMiddleware([mw3, mw2, mw1])(handleGet)                                  
 *                                                                                               
 * The last line in the example above is equivalent to                                           
 *                                                                                               
 *   export const get = async (req) = mw3(mw2(mw1(handleGet))))(req)                             
 *                                                                                               
 * The middleware functions are expected to look like                                            
 *                                                                                               
 *   (next) => async (req) => {                                                                  
 *     // do stuff on the way in                                                       
 *     const result = await next(req)                                                            
 *     // do stuff on the way out                                                        
 *     return result                                                                             
 *   }                                                                                           
 *                                                                                               
 */                                                                                              
                                                                                                 
export const applyMiddleware = (middleware) => (handler) =>                                      
  middleware.reduceRight((next, fn) => fn(next), handler)