A Stack of Middleware

A stack/array of Express style middleware.

Usage

$ npm install --save mwstack

const app = require('express')()
const {Stack} = require('mwstack')

// Create a stack with some middleware
const stack = new Stack()
  .use(function (req, res, next) {
    // do stuff
    next()
  }, function (req, res) {
    // do other stuff
    // send response
    res.send()
  })
  .error(function (err, req, res, next) {
    // handle errors
    next()
  })

// Hook into express
app.use(stack)

API

new Stack([...mw])

Create a new stack. A stack is an array like object with a few additional methods.

stack.use(...mw)

Add middleware to the stack. Middleware are added in order and arrays are not flattened.

stack.error(...mw)

Add error middleware to the stack. Error middleware are added in order and arrays are not flattened.

stack.infer(...mw)

Add normal middleware or error middleware to the stack, infer they type based on the arity of the function (0-3 args is normal, 4 args is error). This behavior is the legacy behavior Express used to infer the middleware type.

new FlatStack([...mw])

Create a new flat stack. These are the same as Stack except arrays of middleware are flattened when added.

isError(fnc)

Returns true when the middleware was added to a stack as an error middleware.

IS_ERROR

A symbol used internally to label middleware functions as errors.