@virtualstate/examples/lib/examples/experiments/store/read.js

export async function* read(options, state) {
    if (!state)
        return;
    const children = state.children;
    if (!children)
        return;
    const domainSources = options.domain.map(value => value.source);
    const domainVisit = options.visit?.map(value => value.source) ?? domainSources;
    let latest = [];
    for await (const update of children) {
        latest = update.filter(isInDomain);
        if (options.final)
            continue;
        yield* yieldLatest();
    }
    if (options.final)
        yield* yieldLatest();
    async function* yieldLatest() {
        yield* latest;
        const visit = latest.filter(isInDomainVisit);
        for (const next of visit) {
            yield* read(options, next);
        }
    }
    function isInDomain(value) {
        return domainSources.includes(value.source);
    }
    function isInDomainVisit(value) {
        return domainVisit.includes(value.source);
    }
}
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