next/dist/esm/server/dynamic-rendering-utils.js

The React Framework

export function isHangingPromiseRejectionError(err) {
    if (typeof err !== 'object' || err === null || !('digest' in err)) {
        return false;
    }
    return err.digest === HANGING_PROMISE_REJECTION;
}
const HANGING_PROMISE_REJECTION = 'HANGING_PROMISE_REJECTION';
class HangingPromiseRejectionError extends Error {
    constructor(expression){
        super(`During prerendering, ${expression} rejects when the prerender is complete. Typically these errors are handled by React but if you move ${expression} to a different context by using \`setTimeout\`, \`after\`, or similar functions you may observe this error and you should handle it in that context.`), this.expression = expression, this.digest = HANGING_PROMISE_REJECTION;
    }
}
/**
 * This function constructs a promise that will never resolve. This is primarily
 * useful for dynamicIO where we use promise resolution timing to determine which
 * parts of a render can be included in a prerender.
 *
 * @internal
 */ export function makeHangingPromise(signal, expression) {
    const hangingPromise = new Promise((_, reject)=>{
        signal.addEventListener('abort', ()=>{
            reject(new HangingPromiseRejectionError(expression));
        }, {
            once: true
        });
    });
    // We are fine if no one actually awaits this promise. We shouldn't consider this an unhandled rejection so
    // we attach a noop catch handler here to suppress this warning. If you actually await somewhere or construct
    // your own promise out of it you'll need to ensure you handle the error when it rejects.
    hangingPromise.catch(ignoreReject);
    return hangingPromise;
}
function ignoreReject() {}

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