52 lines
2.4 KiB
JavaScript
52 lines
2.4 KiB
JavaScript
export function isHangingPromiseRejectionError(err) {
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if (typeof err !== 'object' || err === null || !('digest' in err)) {
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return false;
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}
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return err.digest === HANGING_PROMISE_REJECTION;
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}
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const HANGING_PROMISE_REJECTION = 'HANGING_PROMISE_REJECTION';
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class HangingPromiseRejectionError extends Error {
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constructor(expression){
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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;
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}
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}
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const abortListenersBySignal = new WeakMap();
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/**
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* This function constructs a promise that will never resolve. This is primarily
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* useful for dynamicIO where we use promise resolution timing to determine which
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* parts of a render can be included in a prerender.
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*
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* @internal
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*/ export function makeHangingPromise(signal, expression) {
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if (signal.aborted) {
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return Promise.reject(new HangingPromiseRejectionError(expression));
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} else {
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const hangingPromise = new Promise((_, reject)=>{
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const boundRejection = reject.bind(null, new HangingPromiseRejectionError(expression));
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let currentListeners = abortListenersBySignal.get(signal);
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if (currentListeners) {
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currentListeners.push(boundRejection);
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} else {
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const listeners = [
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boundRejection
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];
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abortListenersBySignal.set(signal, listeners);
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signal.addEventListener('abort', ()=>{
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for(let i = 0; i < listeners.length; i++){
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listeners[i]();
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}
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}, {
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once: true
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});
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}
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});
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// We are fine if no one actually awaits this promise. We shouldn't consider this an unhandled rejection so
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// we attach a noop catch handler here to suppress this warning. If you actually await somewhere or construct
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// your own promise out of it you'll need to ensure you handle the error when it rejects.
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hangingPromise.catch(ignoreReject);
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return hangingPromise;
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}
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}
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function ignoreReject() {}
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//# sourceMappingURL=dynamic-rendering-utils.js.map
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