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| 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 | 634x 722x 634x 722x 722x 722x 722x 691x 691x 25x 14x 14x 14x 11x 11x 11x 634x 4293x | import { captureException } from "@sentry/react";
import { ComponentType, LazyExoticComponent, lazy } from "react";
import { browserStorageEventPrefix } from "shared/constants/browserStorage";
// Keyed per chunk, not once for the whole app. A shared flag is cleared by any
// import that succeeds, and the app's own chunk succeeds on every load - so a
// view whose chunk stays broken would set the flag, reload, have it cleared
// again, and reload forever without ever reaching an error boundary.
const retryKey = (chunkName: string): string =>
`${browserStorageEventPrefix}-chunk-retry-${chunkName}`;
// Exported so the retry behavior can be unit tested without rendering
// https://raphael-leger.medium.com/react-webpack-chunkloaderror-loading-chunk-x-failed-ac385bd110e0
export const importWithRetry = async (
chunkName: string,
importComponent: () => Promise<{ default: ComponentType }>,
): Promise<{ default: ComponentType }> => {
const key = retryKey(chunkName);
const alreadyRetried = localStorage.getItem(key) === "true";
try {
const component = await importComponent();
localStorage.removeItem(key);
return component;
} catch (error) {
if (!alreadyRetried) {
localStorage.setItem(key, "true");
location.reload();
// Return a never-resolving promise to prevent the error from
// reaching Sentry while the page reloads
// eslint-disable-next-line @typescript-eslint/no-empty-function
return new Promise(() => {});
}
// Reported as a new error rather than the caught one, which the module
// loader throws with the document URL as its only frame: that frame carries
// none of the build's stamps, so the injected-script filter discards it
const detail = error instanceof Error ? error.message : String(error);
captureException(
new Error(`Chunk load failed after retry: ${chunkName} - ${detail}`),
);
// The flag stays set: clearing it here would let the next load reload
// once more for the same broken chunk, forever. This chunk importing
// successfully clears it, which is what makes a later failure retry again
// eslint-disable-next-line no-restricted-syntax -- Okay to throw if module loading fails after page reload.
throw error;
}
};
export const lazyWithRetry = (
chunkName: string,
importComponent: () => Promise<{ default: ComponentType }>,
): LazyExoticComponent<ComponentType> =>
lazy(async () => await importWithRetry(chunkName, importComponent));
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