Register single dependency

Is your feature request related to a problem? Please describe. When I need to register a single dependency, the current Laconia API is asking me to return an object, which lead to a verbose code.

const instances = ({ env }) => ({
  orderStream: new KinesisOrderStream(env.ORDER_STREAM_NAME)
});

exports.handler = laconia(kinesis(app))
  .register(instances);

Describe the solution you’d like

exports.handler = laconia(kinesis(app))
  .register("orderStream", ({env}) => new KinesisOrderStream(env.ORDER_STREAM_NAME) );

This will also allow users to decouple their factories better from Laconia:

exports.handler = laconia(kinesis(app))
  .register("orderStream", ({env}) => myOwnFactory(env.ORDER_STREAM_NAME) );

[hugosenari]

Suggestion, add helper to convert to expected type:

const simple = (obj = {}) => deps => Object
    .entries(obj)
    .reduce((result, [key, fn]) => ({ ...result, [key]: fn(deps) }), {});

const constants = (obj = {}) => () => Object
    .entries(obj)
    .reduce((result, [key, value]) => ({ ...result, [key]: value }), {});

usage:

laconia(app)
    .register(simple({
        orderStream: ({env}) =>  myOwnFactory(env.ORDER_STREAM_NAME)
    }))
    .register(constants({
        ONE: 1,
        foo: 'bar'
    })); 

[ceilfors]

@hugosenari I didn’t realize how difficult it is to overload things in JavaScript, my bad. Maybe adding a new method is a good way to go, I’ll continue the conversation in the PR.