@ctx-core/nanostores/computed/index.test.ts

ctx-core nanostores

import { test } from 'uvu'
import { equal, is } from 'uvu/assert'
import { atom_, computed_, type ReadableAtom_ } from '../index.js'
test('computed_()()', ()=>{
	const letter$ = atom_('a')
	const number$ = atom_(0)
	const str_ = computed_([letter$, number$], (letter, number)=>{
		return `${letter}-${String(number * 2)}`
	})
	is(str_(), 'a-0')
	is(str_._, 'a-0')
	is(str_.$, 'a-0')
	is(str_.get(), 'a-0')
	letter$.set('b')
	is(str_(), 'b-0')
	is(str_._, 'b-0')
	is(str_.$, 'b-0')
	is(str_.get(), 'b-0')
	number$.set(2)
	is(str_(), 'b-4')
	is(str_._, 'b-4')
	is(str_.$, 'b-4')
	is(str_.get(), 'b-4')
})
test('computed_|assign', ()=>{
	const letter$ = computed_(atom_('a'), $=>$) as Foobar
	letter$.foobar = 'baz'
	equal(letter$.foobar, 'baz')
})
test.run()
interface Foobar extends ReadableAtom_<string> {
	foobar:string
}