Allows micro cli to use custom onError.

[rickharrison]

The micro cli now will read in exports.onError and pass it to serve if it exists. Here is an example:

module.exports = exports = async function (request, response) {
  throw createError(405, 'Method Not Allowed');
};

exports.onError = function (req, res, { statusCode, message, stack }) {
  send(res, statusCode, {
    statusCode,
    message
  });
}

Please let me know if this is something you would be open to merging. If so, I will add tests and documentation. Thanks!

[leo]

Thanks!

[rickharrison]

Oops, I didn't write the tests yet. I'll write the tests this weekend and submit another PR.

[rauchg]

There's a more elegant solution for this: just set up your own try/catch at the top level.

const withErrors = require('my-app-on-error')
module.exports = withErrors((req, res) => {
  throw new Error('voila!')
})

In fact, @nkzawa has brought up before that onError is a bit of a stink, and I'm all for deprecating it in the future. Fewer features.

[leo]

@rauchg Got it! Let's remove it...

[rickharrison]

Cool, that sounds good. I just published micro-json-error as a small package for my use case using the method you described: https://github.com/rickharrison/micro-json-error

[rauchg]

@rickharrison that's really cool!