Merge in context with base property

[amorev]

Idea of improvement

If we create stage with reusable function, we'll meet problem with "props already exists". I made small improvement by adding property to configuration of stageFunction.

Example

Now we can merge context of same functions

Code

const createPipeline = require('./easy-pipeline/src/index')
const stageA = name => {
  const stage = context => {
    if (context.props.bar) {
      return { bara: 'b' }
    } else
      return { bar: 'b' }
  }
  stage.config = { name }
  stage.config.useNameAsObject = true

  return stage
}

createPipeline(stageA('test'), stageA('test2'))().fork(err => console.error(err), r => console.log(r))

Result

So after this we'll receive such result:

{ test: { bar: 'b' }, test2: { bar: 'b' } }

Where to use

As you can see, there is no problem with same logic but different names. I would like to use your pipeline, for example, for telegram bot integration. I'll have stage "sendMessage", which returns telegram bot api's result.

I want to be able to call this stage multiple times in single pipelines and use result of every execution in context and have possibility to use it

Small (really big) problem

I can't make your tests passing. Even without my updates tests
check/easy-pipeline/test/index.js:329
and
check/easy-pipeline/test/index.js:336

Are failing and I can't understand that's wrong.

Thank you!