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import { is_array } from './internal/client/utils.js';
import { user_effect } from './internal/client/index.js';
/**
* The `onMount` function schedules a callback to run as soon as the component has been mounted to the DOM.
* It must be called during the component's initialisation (but doesn't need to live *inside* the component;
* it can be called from an external module).
*
* If a function is returned _synchronously_ from `onMount`, it will be called when the component is unmounted.
*
* `onMount` does not run inside a [server-side component](https://svelte.dev/docs#run-time-server-side-component-api).
*
* https://svelte.dev/docs/svelte#onmount
* @template T
* @param {() => import('./internal/types').NotFunction<T> | Promise<import('./internal/types').NotFunction<T>> | (() => any)} fn
* @returns {void}
*/
export function onMount(fn) {
if (current_component_context === null) {
throw new Error('onMount can only be used during component initialisation.');
}
if (current_component_context.r) {
user_effect(() => {
const cleanup = untrack(fn);
if (typeof cleanup === 'function') return /** @type {() => void} */ (cleanup);
});
} else {
init_update_callbacks(current_component_context).m.push(fn);
}
}
/**
* Schedules a callback to run immediately before the component is unmounted.
*
* Out of `onMount`, `beforeUpdate`, `afterUpdate` and `onDestroy`, this is the
* only one that runs inside a server-side component.
*
* https://svelte.dev/docs/svelte#ondestroy
* @param {() => any} fn
* @returns {void}
*/
export function onDestroy(fn) {
if (current_component_context === null) {
throw new Error('onDestroy can only be used during component initialisation.');
}
onMount(() => () => untrack(fn));
}
/**
* @template [T=any]
* @param {string} type
* @param {T} [detail]
* @param {any}params_0
* @returns {CustomEvent<T>}
*/
function create_custom_event(type, detail, { bubbles = false, cancelable = false } = {}) {
return new CustomEvent(type, { detail, bubbles, cancelable });
}
/**
* Creates an event dispatcher that can be used to dispatch [component events](https://svelte.dev/docs#template-syntax-component-directives-on-eventname).
* Event dispatchers are functions that can take two arguments: `name` and `detail`.
*
* Component events created with `createEventDispatcher` create a
* [CustomEvent](https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent).
* These events do not [bubble](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Building_blocks/Events#Event_bubbling_and_capture).
* The `detail` argument corresponds to the [CustomEvent.detail](https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/detail)
* property and can contain any type of data.
*
* The event dispatcher can be typed to narrow the allowed event names and the type of the `detail` argument:
* ```ts
* const dispatch = createEventDispatcher<{
* loaded: never; // does not take a detail argument
* change: string; // takes a detail argument of type string, which is required
* optional: number | null; // takes an optional detail argument of type number
* }>();
* ```
*
* https://svelte.dev/docs/svelte#createeventdispatcher
* @deprecated Use callback props and/or the `$host()` rune instead — see https://svelte-5-preview.vercel.app/docs/deprecations#createeventdispatcher
* @template {Record<string, any>} [EventMap = any]
* @returns {import('./index.js').EventDispatcher<EventMap>}
*/
export function createEventDispatcher() {
const component_context = current_component_context;
if (component_context === null) {
throw new Error('createEventDispatcher can only be used during component initialisation.');
}
return (type, detail, options) => {
const events = /** @type {Record<string, Function | Function[]>} */ (
component_context.s.$$events
)?.[/** @type {any} */ (type)];
if (events) {
const callbacks = is_array(events) ? events.slice() : [events];
// TODO are there situations where events could be dispatched
// in a server (non-DOM) environment?
const event = create_custom_event(/** @type {string} */ (type), detail, options);
for (const fn of callbacks) {
fn.call(component_context.x, event);
}
return !event.defaultPrevented;
}
return true;
};
}
// TODO mark beforeUpdate and afterUpdate as deprecated in Svelte 6
/**
* Schedules a callback to run immediately before the component is updated after any state change.
*
* The first time the callback runs will be before the initial `onMount`.
*
* In runes mode use `$effect.pre` instead.
*
* https://svelte.dev/docs/svelte#beforeupdate
* @deprecated Use `$effect.pre` instead — see https://svelte-5-preview.vercel.app/docs/deprecations#beforeupdate-and-afterupdate
* @param {() => void} fn
* @returns {void}
*/
export function beforeUpdate(fn) {
if (current_component_context === null) {
throw new Error('beforeUpdate can only be used during component initialisation');
}
if (current_component_context.r) {
throw new Error('beforeUpdate cannot be used in runes mode');
}
init_update_callbacks(current_component_context).b.push(fn);
}
/**
* Schedules a callback to run immediately after the component has been updated.
*
* The first time the callback runs will be after the initial `onMount`.
*
* In runes mode use `$effect` instead.
*
* https://svelte.dev/docs/svelte#afterupdate
* @deprecated Use `$effect` instead — see https://svelte-5-preview.vercel.app/docs/deprecations#beforeupdate-and-afterupdate
* @param {() => void} fn
* @returns {void}
*/
export function afterUpdate(fn) {
if (current_component_context === null) {
throw new Error('afterUpdate can only be used during component initialisation.');
}
if (current_component_context.r) {
throw new Error('afterUpdate cannot be used in runes mode');
}
init_update_callbacks(current_component_context).a.push(fn);
}
/**
* Legacy-mode: Init callbacks object for onMount/beforeUpdate/afterUpdate
* @param {import('./internal/client/types.js').ComponentContext} context
*/
function init_update_callbacks(context) {
return (context.u ??= { a: [], b: [], m: [] });
}
/**
* Synchronously flushes any pending state changes and those that result from it.
* @param {() => void} [fn]
* @returns {void}
*/
export function flushSync(fn) {
flush_sync(fn);
}
export { hydrate, mount, unmount } from './internal/client/render.js';
export {
getContext,
getAllContexts,
hasContext,
setContext,
tick,
untrack
} from './internal/client/runtime.js';
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