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Lint and format src/runtime/store/index.js

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pull/8569/head
S. Elliott Johnson 3 years ago
parent 4e74b7de3c
commit efec4ef130
1 changed files with 141 additions and 132 deletions
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273
src/runtime/store/index.js
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@ -1,4 +1,11 @@
import { run_all, subscribe, noop, safe_not_equal, is_function, get_store_value } from '../internal';
import {
run_all,
subscribe,
noop,
safe_not_equal,
is_function,
get_store_value
} from '../internal';
const subscriber_queue = [];
/**
* Creates a `Readable` store that allows reading by subscription.
@ -7,9 +14,9 @@ const subscriber_queue = [];
* @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Readable<T>}
*/
export function readable(value, start) {
return {
subscribe: writable(value, start).subscribe
};
return {
subscribe: writable(value, start).subscribe
};
}
/**
* Create a `Writable` store that allows both updating and reading by subscription.
@ -18,59 +25,59 @@ export function readable(value, start) {
* @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Writable<T>}
*/
export function writable(value, start = noop) {
/** @type {Unsubscriber} */
let stop;
/** @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(value));
}
/** @param {Subscriber<T>} run
* @param {Invalidator<T>} invalidate
* @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").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(value);
return () => {
subscribers.delete(subscriber);
if (subscribers.size === 0 && stop) {
stop();
stop = null;
}
};
}
return { set, update, subscribe };
/** @type {Unsubscriber} */
let stop;
/** @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(value));
}
/** @param {Subscriber<T>} run
* @param {Invalidator<T>} invalidate
* @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").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(value);
return () => {
subscribers.delete(subscriber);
if (subscribers.size === 0 && stop) {
stop();
stop = null;
}
};
}
return { set, update, subscribe };
}
/** @param {Stores} stores
* @param {Function} fn
@ -78,53 +85,56 @@ export function writable(value, start = noop) {
* @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").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;
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 = is_function(result) ? result : noop;
}
};
const unsubscribers = stores_array.map((store, i) => subscribe(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;
};
});
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;
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 = is_function(result) ? result : noop;
}
};
const unsubscribers = stores_array.map((store, i) =>
subscribe(
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.
@ -133,9 +143,9 @@ export function derived(stores, fn, initial_value) {
* @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Readable<T>}
*/
export function readonly(store) {
return {
subscribe: store.subscribe.bind(store)
};
return {
subscribe: store.subscribe.bind(store)
};
}
/**
* Get the current value from a store by subscribing and immediately unsubscribing.
@ -143,38 +153,37 @@ export function readonly(store) {
*/
export { get_store_value as get };
/**
* @typedef {(value: T) => void} Subscriber
* @template T
*/
* @typedef {(value: T) => void} Subscriber
* @template T
*/
/** @typedef {() => void} Unsubscriber */
/**
* @typedef {(value: T) => T} Updater
* @template T
*/
* @typedef {(value: T) => T} Updater
* @template T
*/
/**
* @typedef {(value?: T) => void} Invalidator
* @template T
*/
* @typedef {(value?: T) => void} Invalidator
* @template T
*/
/**
* @typedef {(
* set: (value: T) => void,
* update: (fn: Updater<T>) => void
* ) => void | (() => void)} StartStopNotifier
* @template T
*/
* @typedef {(
* set: (value: T) => void,
* update: (fn: Updater<T>) => void
* ) => void | (() => void)} StartStopNotifier
* @template T
*/
/**
* @typedef {[Subscriber<T>, Invalidator<T>]} SubscribeInvalidateTuple
* @template T
*/
* @typedef {[Subscriber<T>, Invalidator<T>]} SubscribeInvalidateTuple
* @template T
*/
/** @typedef {Readable<any> | [Readable<any>, ...Array<Readable<any>>] | Array<Readable<any>>} Stores */
/**
* @typedef {T extends Readable<infer U>
* ? U
* : { [K in keyof T]: T[K] extends Readable<infer U> ? U : never }} StoresValues
* @template T
*/
* @typedef {T extends Readable<infer U>
* ? U
* : { [K in keyof T]: T[K] extends Readable<infer U> ? U : never }} StoresValues
* @template T
*/
/**
* Readable interface for subscribing.
@ -183,4 +192,4 @@ export { get_store_value as get };
/**
* Writable interface for both updating and subscribing.
* @typedef {Object} Writable
*/
*/

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