next/dist/esm/server/lib/lazy-result.js

The React Framework

/**
 * Calls the given async function only when the returned promise-like object is
 * awaited. Afterwards, it provides the resolved value synchronously as `value`
 * property.
 */ export function createLazyResult(fn) {
    let pendingResult;
    const result = {
        then (onfulfilled, onrejected) {
            if (!pendingResult) {
                pendingResult = fn();
            }
            pendingResult.then((value)=>{
                result.value = value;
            }).catch(()=>{
            // The externally awaited result will be rejected via `onrejected`. We
            // don't need to handle it here. But we do want to avoid an unhandled
            // rejection.
            });
            return pendingResult.then(onfulfilled, onrejected);
        }
    };
    return result;
}
export function isResolvedLazyResult(result) {
    return result.hasOwnProperty('value');
}

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