Installation

npm i @reatom/npm-svelte

Usage

First of all, you need to setup ctx for svelte context in your root component.

import { setupCtx } from '@reatom/npm-svelte'

setupCtx()

We recommend to add logger for dev environment, from @reatom/logger directly, or from @reatom/framework.

import { createCtx, connectLogger } from '@reatom/framework'
import { setupCtx } from '@reatom/npm-svelte'
import { dev } from '$app/environment' // SvelteKit

const ctx = createCtx()
if (dev) connectLogger(ctx)
setupCtx(ctx)

Than you can bind subscribe and set (for mutable atoms) to your atoms by withSvelte and use it as a store.

IMPORTANT, use withSvelte only in component script tag, as it reads the context.

<script>
  import { atom } from '@reatom/core'
  import { withSvelte } from '@reatom/npm-svelte'

  const count = atom(0).pipe(withSvelte)
</script>

<button on:click={() => $count++}>
	Clicked {$count} {$count === 1 ? 'time' : 'times'}
</button>

Of course, you could describe atoms as a separate module and bind actions with the same withSvelte(anAction).set.

repl.

<script>
	import { withSvelte } from '@reatom/npm-svelte'
  import { countAtom, timesAtom, increment } from './model'

	const count = withSvelte(countAtom)
	const times = withSvelte(timesAtom)
	const handleIncrement = withSvelte(increment).set
</script>

<button on:click={handleIncrement}>
	Clicked {$count} {$times}
</button>

// model.ts
import { atom, action } from '@reatom/core'

export const countAtom = atom(0, 'countAtom')
export const timesAtom = atom(
  (ctx) => (ctx.spy(countAtom) === 1 ? 'time' : 'times'),
  'timesAtom',
)
export const increment = action(
  (ctx) => countAtom(ctx, (s) => ++s),
  'increment',
)

Data fetching and Svelte

https://svelte.dev/repl/0613e23e6aa74246afad6d726d6c5a33?version=3.55.0