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/** @import { Stores, StoresValues, SubscribeInvalidateTuple } from './private' */
import { noop, run_all } from '../internal/shared/utils.js';
import { safe_not_equal } from '../internal/client/reactivity/equality.js';
import { subscribe_to_store } from './utils.js';
/**
* @type {Array<SubscribeInvalidateTuple<any> | any>}
*/
const subscriber_queue = [];
/**
* Creates a `Readable` store that allows reading by subscription.
*
* https://svelte.dev/docs/svelte-store#readable
* @template T
* @param {T} [value] initial value
* @param {StartStopNotifier<T>} [start]
* @returns {Readable<T>}
*/
export function readable(value, start) {
return {
subscribe: writable(value, start).subscribe
};
}
/**
* Create a `Writable` store that allows both updating and reading by subscription.
*
* https://svelte.dev/docs/svelte-store#writable
* @template T
* @param {T} [value] initial value
* @param {StartStopNotifier<T>} [start]
* @returns {Writable<T>}
*/
export function writable(value, start = noop) {
/** @type {Unsubscriber | null} */
let stop = null;
/** @type {Set<SubscribeInvalidateTuple<T>>} */
const subscribers = new Set();
/**
* @param {T} new_value
* @returns {void}
*/
function set(new_value) {
if (safe_not_equal(value, new_value)) {
value = new_value;
if (stop) {
// store is ready
const run_queue = !subscriber_queue.length;
for (const subscriber of subscribers) {
subscriber[1]();
subscriber_queue.push(subscriber, value);
}
if (run_queue) {
for (let i = 0; i < subscriber_queue.length; i += 2) {
subscriber_queue[i][0](subscriber_queue[i + 1]);
}
subscriber_queue.length = 0;
}
}
}
}
/**
* @param {Updater<T>} fn
* @returns {void}
*/
function update(fn) {
set(fn(/** @type {T} */ (value)));
}
/**
* @param {Subscriber<T>} run
* @param {() => void} [invalidate]
* @returns {Unsubscriber}
*/
function subscribe(run, invalidate = noop) {
/** @type {SubscribeInvalidateTuple<T>} */
const subscriber = [run, invalidate];
subscribers.add(subscriber);
if (subscribers.size === 1) {
stop = start(set, update) || noop;
}
run(/** @type {T} */ (value));
return () => {
subscribers.delete(subscriber);
if (subscribers.size === 0 && stop) {
stop();
stop = null;
}
};
}
return { set, update, subscribe };
}
/**
* Derived value store by synchronizing one or more readable stores and
* applying an aggregation function over its input values.
*
* https://svelte.dev/docs/svelte-store#derived
* @template {Stores} S
* @template T
* @overload
* @param {S} stores
* @param {(values: StoresValues<S>, set: (value: T) => void, update: (fn: Updater<T>) => void) => Unsubscriber | void} fn
* @param {T} [initial_value]
* @returns {Readable<T>}
*/
/**
* Derived value store by synchronizing one or more readable stores and
* applying an aggregation function over its input values.
*
* https://svelte.dev/docs/svelte-store#derived
* @template {Stores} S
* @template T
* @overload
* @param {S} stores
* @param {(values: StoresValues<S>) => T} fn
* @param {T} [initial_value]
* @returns {Readable<T>}
*/
/**
* @template {Stores} S
* @template T
* @param {S} stores
* @param {Function} fn
* @param {T} [initial_value]
* @returns {Readable<T>}
*/
export function derived(stores, fn, initial_value) {
const single = !Array.isArray(stores);
/** @type {Array<Readable<any>>} */
const stores_array = single ? [stores] : stores;
if (!stores_array.every(Boolean)) {
throw new Error('derived() expects stores as input, got a falsy value');
}
const auto = fn.length < 2;
return readable(initial_value, (set, update) => {
let started = false;
/** @type {T[]} */
const values = [];
let pending = 0;
let cleanup = noop;
const sync = () => {
if (pending) {
return;
}
cleanup();
const result = fn(single ? values[0] : values, set, update);
if (auto) {
set(result);
} else {
cleanup = typeof result === 'function' ? result : noop;
}
};
const unsubscribers = stores_array.map((store, i) =>
subscribe_to_store(
store,
(value) => {
values[i] = value;
pending &= ~(1 << i);
if (started) {
sync();
}
},
() => {
pending |= 1 << i;
}
)
);
started = true;
sync();
return function stop() {
run_all(unsubscribers);
cleanup();
// We need to set this to false because callbacks can still happen despite having unsubscribed:
// Callbacks might already be placed in the queue which doesn't know it should no longer
// invoke this derived store.
started = false;
};
});
}
/**
* Takes a store and returns a new one derived from the old one that is readable.
*
* https://svelte.dev/docs/svelte-store#readonly
* @template T
* @param {Readable<T>} store - store to make readonly
* @returns {Readable<T>}
*/
export function readonly(store) {
return {
// @ts-expect-error TODO i suspect the bind is unnecessary
subscribe: store.subscribe.bind(store)
};
}
/**
* Get the current value from a store by subscribing and immediately unsubscribing.
*
* https://svelte.dev/docs/svelte-store#get
* @template T
* @param {Readable<T>} store
* @returns {T}
*/
export function get(store) {
let value;
subscribe_to_store(store, (_) => (value = _))();
// @ts-expect-error
return value;
}
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