Express 4

[johngeorgewright]

Now that Express 4 no longer excepts objects as middleware we have to use callbacks instead.

To keep asset-rack working in express 4, with some kind of fallback capabilities for express 3, I'm proposing to specify the Rack#handle method when adding the rack/asset as middleware. I've also upgraded CoffeeScript, so I could easily bind the class's method to any instance
of it with the new fat-arrow syntax.

Another problem is the express.Response#locals property is no longer a function. Therefore I've added the assets' "locals" property directly to
the express instance.

[ryanbillingsley]

@johngeorgewright I am getting an error when trying to use this with express 4.1.1

TypeError: Property 'locals' of object #<ServerResponse> is not a function
    at Layer.exports.Rack.Rack.handle (/Users/ryanbillingsley/Dev/covert-deer/node_modules/asset-rack/compiled/rack.js:79:16)

[ryanbillingsley]

Never mind, looks like it is choking on coffee-script not being compiled now

[johngeorgewright]

Maybe I'm using a newer version of CoffeeScript?

[ryanbillingsley]

The problem is in the switch.js

try {
    module.exports = require('./compiled');
} catch(error) {
    //require('./node_modules/coffee-script');
    require('coffee-script');
    module.exports = require('./lib');
}

require is failing to find the module './lib'

It could be because I am loading the module in through git and not through a module, not sure.

[ryanbillingsley]

I think this would be the problem jashkenas/coffeescript#3279

Coffee-script introduced a breaking change to how requiring coffee-script works.

[johngeorgewright]

Good catch.

[martindale]

This is failing for me on both the latest version of Express (4.3.2) and the version listed here (4.1.1), with a request that never seems to get handled (server just hangs on all requests...)

[johngeorgewright]

Hey @martindale, are you giving the #handle method to express#use?

https://github.com/johngeorgewright/asset-rack/blob/express-4/README.md#getting-started

I think that's what was happening to me until I made this pull request.