@coriolis/parametered-projection

Parametered projections for Coriolis

This package provides useful projections and tools to build projections that can be customized.

Install

npm install --save @coriolis/parametered-projection

Usage

import { lastPayloadOfType } from '@coriolis/parametered-projection'

// This projection would return an array of all payloads of events with type "target event type"
const myProjection = ({ useState, useProjection }) => (
  useState(0),
  useProjection(lastPayloadOfType('target event type')),
  (list, event) => [...list, event]
)

Of course this code sample is not doing anything interesting. But parametered projections are really helpful in real world.