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26d82c6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | "use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "installProcessErrorHandlers", {
enumerable: true,
get: function() {
return installProcessErrorHandlers;
}
});
const _ispostpone = require("../lib/router-utils/is-postpone");
let _global = globalThis;
function installProcessErrorHandlers(shouldRemoveUncaughtErrorAndRejectionListeners) {
if (_global.nextInitializedProcessErrorHandlers) return;
_global.nextInitializedProcessErrorHandlers = true;
// The conventional wisdom of Node.js and other runtimes is to treat
// unhandled errors as fatal and exit the process.
//
// But Next.js is not a generic JS runtime — it's a specialized runtime for
// React Server Components.
//
// Many unhandled rejections are due to the late-awaiting pattern for
// prefetching data. In Next.js it's OK to call an async function without
// immediately awaiting it, to start the request as soon as possible
// without blocking unncessarily on the result. These can end up
// triggering an "unhandledRejection" if it later turns out that the
// data is not needed to render the page. Example:
//
// const promise = fetchData()
// const shouldShow = await checkCondition()
// if (shouldShow) {
// return <Component promise={promise} />
// }
//
// In this example, `fetchData` is called immediately to start the request
// as soon as possible, but if `shouldShow` is false, then it will be
// discarded without unwrapping its result. If it errors, it will trigger
// an "unhandledRejection" event.
//
// Ideally, we would suppress these rejections completely without warning,
// because we don't consider them real errors. (TODO: Currently we do warn.)
//
// But regardless of whether we do or don't warn, we definitely shouldn't
// crash the entire process.
//
// Even a "legit" unhandled error unrelated to prefetching shouldn't
// prevent the rest of the page from rendering.
//
// So, we're going to intentionally override the default error handling
// behavior of the outer JS runtime to be more forgiving
// Remove any existing "unhandledRejection" and "uncaughtException" handlers.
// This is gated behind an experimental flag until we've considered the impact
// in various deployment environments. It's possible this may always need to
// be configurable.
if (shouldRemoveUncaughtErrorAndRejectionListeners) {
process.removeAllListeners('uncaughtException');
process.removeAllListeners('unhandledRejection');
}
// Install a new handler to prevent the process from crashing.
process.on('unhandledRejection', (reason)=>{
if ((0, _ispostpone.isPostpone)(reason)) {
// React postpones that are unhandled might end up logged here but they're
// not really errors. They're just part of rendering.
return;
}
// Immediately log the error.
// TODO: Ideally, if we knew that this error was triggered by application
// code, we would suppress it entirely without logging. We can't reliably
// detect all of these, but when cacheComponents is enabled, we could suppress
// at least some of them by waiting to log the error until after all in-
// progress renders have completed. Then, only log errors for which there
// was not a corresponding "rejectionHandled" event.
console.error(reason);
});
process.on('rejectionHandled', ()=>{
// TODO: See note in the unhandledRejection handler above. In the future,
// we may use the "rejectionHandled" event to de-queue an error from
// being logged.
});
// Unhandled exceptions are errors triggered by non-async functions, so this
// is unrelated to the late-awaiting pattern. However, for similar reasons,
// we still shouldn't crash the process. Just log it.
process.on('uncaughtException', (reason)=>{
if ((0, _ispostpone.isPostpone)(reason)) {
return;
}
console.error(reason);
});
}
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