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import { noop } from '../internal/shared/utils.js';
import {
effect_root,
effect_tracking,
render_effect
} from '../internal/client/reactivity/effects.js';
import { source } from '../internal/client/reactivity/sources.js';
import { get as get_source, tick } from '../internal/client/runtime.js';
import { increment } from '../reactivity/utils.js';
import { get, writable } from './shared/index.js';
export { derived, get, readable, readonly, writable } from './shared/index.js';
/**
* @template V
* @overload
* @param {() => V} get
* @param {(v: V) => void} set
* @returns {Writable<V>}
*/
/**
* @template V
* @overload
* @param {() => V} get
* @returns {Readable<V>}
*/
/**
* Create a store from a function that returns state, and (to make a writable store), an
* optional second function that sets state.
*
* ```ts
* import { toStore } from 'svelte/store';
*
* let count = $state(0);
*
* const store = toStore(() => count, (v) => (count = v));
* ```
* @template V
* @param {() => V} get
* @param {(v: V) => void} [set]
* @returns {Writable<V> | Readable<V>}
*/
export function toStore(get, set) {
const store = writable(get(), (set) => {
let ran = false;
// TODO do we need a different implementation on the server?
const teardown = effect_root(() => {
render_effect(() => {
const value = get();
if (ran) set(value);
});
});
ran = true;
return teardown;
});
if (set) {
return {
set,
update: (fn) => set(fn(get())),
subscribe: store.subscribe
};
}
return {
subscribe: store.subscribe
};
}
/**
* @template V
* @overload
* @param {Writable<V>} store
* @returns {{ current: V }}
*/
/**
* @template V
* @overload
* @param {Readable<V>} store
* @returns {{ readonly current: V }}
*/
/**
* Convert a store to an object with a reactive `current` property. If `store`
* is a readable store, `current` will be a readonly property.
*
* ```ts
* import { fromStore, get, writable } from 'svelte/store';
*
* const store = writable(0);
*
* const count = fromStore(store);
*
* count.current; // 0;
* store.set(1);
* count.current; // 1
*
* count.current += 1;
* get(store); // 2
* ```
* @template V
* @param {Writable<V> | Readable<V>} store
*/
export function fromStore(store) {
let value = /** @type {V} */ (undefined);
let version = source(0);
let subscribers = 0;
let unsubscribe = noop;
function current() {
if (effect_tracking()) {
get_source(version);
render_effect(() => {
if (subscribers === 0) {
let ran = false;
unsubscribe = store.subscribe((v) => {
value = v;
if (ran) increment(version);
});
ran = true;
}
subscribers += 1;
return () => {
subscribers -= 1;
tick().then(() => {
if (subscribers === 0) {
unsubscribe();
}
});
};
});
return value;
}
return get(store);
}
if ('set' in store) {
return {
get current() {
return current();
},
set current(v) {
store.set(v);
}
};
}
return {
get current() {
return current();
}
};
}
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