4.0.0-rc.1 is incompatible with Fastify

[artembatura]

• Node Version: v13.11.0
• NPM Version: 6.13.7
• webpack Version: 4.42.0
• webpack-dev-middleware Version: 4.0.0-rc.1

Actual Behavior

When I trying to access application from browser, build is failing with error TypeError: res.get is not a function. In previous version, 3.7.2 it's not happened

I checked that error is happening in new version on this code line

Code

const webpack = require('webpack');
const middleware = require('webpack-dev-middleware').default;
const path = require('path');
const compiler = webpack({
  entry: './src/index.js',
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist'),
  },
});
const fastify = require('fastify');
const app = fastify();

app.use(
  middleware(compiler)
);

app.listen(3000, () => console.log('Example app listening on port 3000!'));

How Do We Reproduce?

1. Bootstrap project from scratch with npm init
2. Run npm i webpack webpack-dev-middleware@next fastify
3. Create file src/index.js and write something valid
4. Place the code above to ./run-webpack.js
5. Run node run-webpack.js
6. Try to access http://localhost:3000/main.js in your browser

Notes

• I also checked that my example works with Express normally, but with Fastify not

[alexander-akait]

We never will be compatibility with fastify, we support only express officialy

In previous version, 3.7.2 it's not happened

it was just luck

[artembatura]

Supporting availability to use with two frameworks is bad idea, agreed

[alexander-akait]

In theory we can implement it, but we need improve tests, let's mark it is feature

[pearofducks]

@artemirq (and any others who find this) - this is working fine with the lastest fastify and fastify-express as the middleware provider (instead of middie)

[alexander-akait]

@pearofducks yep, can you send a PR to docs how to use it with fastify?

[WraithKenny]

This is also breaking with browser-sync where before it was working fine. (In my setup, I have a Gulp file which runs a BrowserSync server, which loads the middleware.) It's the same issue here; should I make a new issue, or just leave this note?

[alexander-akait]

we never supports faslity, please look at README, we write how you should use it with fastify

[gpoitch]

4.0 breaks compatibility with vanilla node http too. (res.get vs res.getHeader)

[alexander-akait]

PR exists #747, we never support is too, I think we fix it in near patch release

[alexander-akait]

Close in favor #945, hope we will improve this in near future