@sv-use/core/dist/default-state/index.svelte.js

A collection of Svelte 5 utilities.

/**
 * A reactive state that falls back to `defaultValue` if set to `null` or `undefined`.
 * @param defaultValue The fallback value when the value is set to `null` or `undefined`.
 * @param initialValue The initial value of the state. Defaults to `defaultValue` if omitted.
 * @see https://svelte-librarian.github.io/sv-use/docs/core/default-state
 */
export function defaultState(defaultValue, initialValue) {
    const _default = $state({ current: initialValue ?? defaultValue });
    const handler = {
        get(target, key) {
            if (target &&
                typeof target === 'object' &&
                typeof target[key] === 'object' &&
                target[key] !== null) {
                return new Proxy(target[key], handler);
            }
            else {
                return target[key];
            }
        },
        set(target, key, value) {
            if (value || JSON.stringify(target) !== JSON.stringify($state.snapshot(_default))) {
                target[key] = value;
            }
            else {
                target[key] = defaultValue;
            }
            return true;
        }
    };
    return new Proxy(_default, handler);
}