@threlte/core/dist/hooks/useThrelteUserContext.js

A 3D framework for the web, built on top of Svelte and Three.js

import { derived } from 'svelte/store';
import { useUserContext } from '../context/fragments/user.js';
export function useThrelteUserContext(namespace, value, options) {
    const userCtxStore = useUserContext();
    if (!userCtxStore) {
        throw new Error('No user context store found, did you invoke this function outside of your main <Canvas> component?');
    }
    // return the plain user context store
    if (!namespace) {
        return {
            subscribe: userCtxStore.subscribe
        };
    }
    // return a specific user context entry
    if (namespace && !value) {
        return derived(userCtxStore, (ctx) => ctx[namespace]);
    }
    // we are possibly setting a new user context entry here
    userCtxStore.update((ctx) => {
        if (namespace in ctx) {
            // skip is the default value
            if (!options || options.existing === 'skip')
                return ctx;
            if (options.existing === 'merge') {
                const v = typeof value === 'function' ? value() : value;
                Object.assign(ctx[namespace], v);
                return ctx;
            }
        }
        // also handles options.existing === 'replace'
        const v = typeof value === 'function' ? value() : value;
        ctx[namespace] = v;
        return ctx;
    });
    return userCtxStore.current[namespace];
}