SvelteJS store for system statuses

processes.js

import { writable, get } from 'svelte/store'

const ERROR = 'error'
const SUCCESS = 'success'
const TRY = 'try'

function init() {

	const { subscribe, set, update, get } = writable({
		log: [],
		processes: {}
	})

	const define = ( id, level, type, data ) => {
		const remove = level == undefined && type == undefined && data == undefined
		if (level == undefined) level = 0
		update( o => {
			if (!remove) {
				o.processes[id] = { id, level, type, data }
				o.log.push( { ...o.processes[id] } )
			}
			if (remove) delete o.processes[id]
			return o
		})
	}
	
	const retrieve = id => {
		let out 
		update( o => {
			out = o.processes[id]
		})
		return o
	}

	const start = ( id, level, data ) => define( id, level, TRY, data ) // create status
	const success = ( id, level, data ) => define( id, level, SUCCESS, data ) // set status to success
	const error = ( id, level, data ) => define( id, level, ERROR, data ) // set status to error
	const clear = ( id ) => define( id ) // clears status
	const status = ( id ) => retrieve( id ) // return status of process
	const is = ( id, type ) => retrieve( id ).type == type // return status of process

	return { 

		set,
		subscribe,
		update,
		ERROR,
		SUCCESS,
		TRY,
		start,
		success,
		error,
		clear,
		status,
		is
	}
}

export default init()