funbox

funbox.js

function funbox(reducer) {
	const box = ctx => box.run(ctx)
	box.use = (...functions) => {
		box.index = (box.index||[]).concat(...functions)
		box.run = ctx => box.index.reduce(reducer, ctx)
	}
	return box
}

const app = funbox((ctx, fun) => {
	console.group(fun.name)
	console.log(ctx)
	ctx = Object.assign(ctx, fun(ctx))
	console.log(ctx)
	console.groupEnd()
	return ctx
})

app.use(function DemoFun(args) {
	const ctx = {
		...args,
		count: 0
	}

	ctx.count = ctx.count || 0
	ctx.xxx = { g: 3 }
	ctx.x = ctx.x || 2000

	try {
		window.apiContext = ctx
		return ctx
	} catch(err) {
		ctx.error = err
		console.error(`demo-fun`, err)
		return ctx
	}
})

app.use(function Foo(ctx) {
	ctx.count++

	if (ctx.x > 100)
		throw new Error(`x > 1000, just to test`)

	ctx.foo = {
		count: ctx.count || 1,
		xCount: ctx.count * 10,
	}

	return ctx
})

app.use(function Bar(ctx) {
	ctx.count++
	ctx.bar = {
		y: 120,
		x: ctx.x,
		theBar: Date.now()
	}
	ctx.y = 8282
	return ctx
})

app.use(function Baz(ctx) {
	ctx.count++
	ctx.baz = {
		xy: [ ctx.x, ctx.y ],
		bX: ctx.x,
		bY: ctx.y,
		theBaz: Date.now()
	}
	return ctx
})

window.ctx = { x: 9, id: 'xxx' }
window.app = app

app(ctx)

//

package.json

{
  "name": "funbox",
  "version": "0.0.2",
  "main": "funbox.js"
}