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import { user_pre_effect } from '../internal/client/reactivity/effects.js';
import { hydrate, mount, unmount } from '../internal/client/render.js';
import { define_property } from '../internal/client/utils.js';
/**
* Takes the same options as a Svelte 4 component and the component function and returns a Svelte 4 compatible component.
*
* @deprecated Use this only as a temporary solution to migrate your imperative component code to Svelte 5.
*
* @template {Record<string, any>} Props
* @template {Record<string, any>} Exports
* @template {Record<string, any>} Events
* @template {Record<string, any>} Slots
*
* @param {import('svelte').ComponentConstructorOptions<Props> & {
* component: import('svelte').ComponentType<import('svelte').SvelteComponent<Props, Events, Slots>> | import('svelte').Component<Props>;
* immutable?: boolean;
* hydrate?: boolean;
* recover?: boolean;
* }} options
* @returns {import('svelte').SvelteComponent<Props, Events, Slots> & Exports}
*/
export function createClassComponent(options) {
// @ts-expect-error $$prop_def etc are not actually defined
return new Svelte4Component(options);
}
/**
* Takes the component function and returns a Svelte 4 compatible component constructor.
*
* @deprecated Use this only as a temporary solution to migrate your imperative component code to Svelte 5.
*
* @template {Record<string, any>} Props
* @template {Record<string, any>} Exports
* @template {Record<string, any>} Events
* @template {Record<string, any>} Slots
*
* @param {import('svelte').SvelteComponent<Props, Events, Slots> | import('svelte').Component<Props>} component
* @returns {import('svelte').ComponentType<import('svelte').SvelteComponent<Props, Events, Slots> & Exports>}
*/
export function asClassComponent(component) {
// @ts-expect-error $$prop_def etc are not actually defined
return class extends Svelte4Component {
/** @param {any} options */
constructor(options) {
super({
component,
...options
});
}
};
}
class Svelte4Component {
/** @type {any} */
#events;
/** @type {Record<string, any>} */
#instance;
/**
* @param {import('svelte').ComponentConstructorOptions & {
* component: any;
* immutable?: boolean;
* hydrate?: boolean;
* recover?: false;
* }} options
*/
constructor(options) {
// Using proxy state here isn't completely mirroring the Svelte 4 behavior, because mutations to a property
// cause fine-grained updates to only the places where that property is used, and not the entire property.
// Reactive statements and actions (the things where this matters) are handling this properly regardless, so it should be fine in practise.
const props = proxy({ ...(options.props || {}), $$events: {} }, false);
this.#instance = (options.hydrate ? hydrate : mount)(options.component, {
target: options.target,
props,
context: options.context,
intro: options.intro,
recover: options.recover
});
this.#events = props.$$events;
for (const key of Object.keys(this.#instance)) {
if (key === '$set' || key === '$destroy' || key === '$on') continue;
define_property(this, key, {
get() {
return this.#instance[key];
},
/** @param {any} value */
set(value) {
this.#instance[key] = value;
},
enumerable: true
});
}
this.#instance.$set = /** @param {Record<string, any>} next */ (next) => {
Object.assign(props, next);
};
this.#instance.$destroy = () => {
unmount(this.#instance);
};
}
/** @param {Record<string, any>} props */
$set(props) {
this.#instance.$set(props);
}
/**
* @param {string} event
* @param {(...args: any[]) => any} callback
* @returns {any}
*/
$on(event, callback) {
this.#events[event] = this.#events[event] || [];
/** @param {any[]} args */
const cb = (...args) => callback.call(this, ...args);
this.#events[event].push(cb);
return () => {
this.#events[event] = this.#events[event].filter(/** @param {any} fn */ (fn) => fn !== cb);
};
}
$destroy() {
this.#instance.$destroy();
}
}
/**
* Runs the given function once immediately on the server, and works like `$effect.pre` on the client.
*
* @deprecated Use this only as a temporary solution to migrate your component code to Svelte 5.
* @param {() => void | (() => void)} fn
* @returns {void}
*/
export function run(fn) {
user_pre_effect(fn);
}
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