Hypermiddleware

Middleware helpers for use with hyperapp.

Installation

npm install hypermiddleware

middleware

The middleware function takes an array of Hyperapp middleware functions, and returns a single middleware function. Hyperapp's middleware property takes a single function, but sometimes, you want to compose multiple middleware functions. The middleware function makes this simple:

Example:

app({
  // ... other stuff ...
  middleware: middleware([middleware1, middleware2, middleware3]),
});

loggerMiddleware

The loggerMiddleware function logs all actions and the resulting state out to the console, similar to redux-logger for Redux.

Example:

app({
  // ... other stuff ...
  middleware: loggerMiddleware,
});

Example application

The following is the Hyperapp add / subtract demo, but with two middleware functions composed into it.

import { middleware, loggerMiddleware } from 'hypermiddleware';
import { h, app } from 'hyperapp';
 
// Just as an example...
function helloMiddleware(next) {
  return (action, props) => {
    console.log('HEYO!!!!!!!!!!!!!!!!!!');
    return next(action, props);
  };
}
 
const Add = x => x + 1;
const Sub = x => x - 1;
 
app({
  init: 0,
  view: state =>
    h('div', {}, [
      h('h1', {}, state),
      h('button', { onClick: Sub }, '-'),
      h('button', { onClick: Add }, '+')
    ]),
  middleware: middleware([loggerMiddleware, helloMiddleware]),
  node: document.getElementById('app')
});

License MIT

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.