# Svelte

There are two different ways to connect Overmind to Svelte. You can use the **reactive declarations** or you can use the **reaction**.

When you connect Overmind to a component you ensure that whenever any tracked state changes, only components interested in that state will re-render.

## Reactive declarations

```javascript
import { createOvermind } from 'overmind'
import { createMixin } from 'overmind-svelte'

const overmind = {
  state: {
    count: 0
  },
  actions: {
    increase({ state }) {
      state.count++;
    },
    decrease({ state }) {
      state.count--;
    }
  }
}

const store = createMixin(createOvermind(overmind))

export const state = store.state
export const actions = store.actions
```

```javascript
<script>
  import { state, actions } from './overmind.js'

  $: count = $state.count
</script>

<p>Count: {count}</p>
<button id="increase" on:click={() => store.actions.increase()}>Increase</button>
<button id="decrease" on:click={() => store.actions.decrease()}>Increase</button>
```

## Reactions

```javascript
import { createOvermind } from 'overmind'
import { createMixin } from 'overmind-svelte'

const overmind = {
  state: {
    count: 0
  },
  actions: {
    increase({ state }) {
      state.count++;
    },
    decrease({ state }) {
      state.count--;
    }
  }
}

const store = createMixin(createOvermind(overmind))

export const state = store.state
export const actions = store.actions
export const reactions = store.reactions
```

```javascript
<script>
  import { state, actions, reactions } from './overmind.js'

  $: count = $state.count
  let doubled = undefined
  store.reaction(
    (state) => state.count,
    (value) => {
        doubled = value * 2
    },
    {
        immediate: true
    }
  )
</script>

<p>Count: {count}</p>
<p>Doubled: {doubled}</p>
<button id="increase" on:click={() => store.actions.increase()}>Increase</button>
<button id="decrease" on:click={() => store.actions.decrease()}>Increase</button>
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://overmindjs.org/v27/views/svelte.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.