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fix rrweb-io#469 try to get original MutationObserver
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We found Angular's zone module will patch MutationObserver which
make the browser hang in some scenarios.
Reference: angular/angular#26948
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Yuyz0112 authored and eoghanmurray committed Feb 3, 2021
1 parent 9356c7b commit 5eccaa6
Showing 1 changed file with 22 additions and 1 deletion.
23 changes: 22 additions & 1 deletion src/record/observer.ts
Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,12 @@ import {
import MutationBuffer from './mutation';
import { stringify } from './stringify';

type WindowWithAngularZone = Window & {
Zone?: {
__symbol__?: (key: string) => string;
};
};

export const mutationBuffer = new MutationBuffer();

function initMutationObserver(
Expand All @@ -65,7 +71,22 @@ function initMutationObserver(
recordCanvas,
slimDOMOptions,
);
const observer = new MutationObserver(
let mutationBufferCtor = window.MutationObserver;
const angularZoneSymbol = (window as WindowWithAngularZone)?.Zone?.__symbol__?.(
'MutationObserver',
);
if (
angularZoneSymbol &&
((window as unknown) as Record<string, typeof MutationObserver>)[
angularZoneSymbol
]
) {
mutationBufferCtor = ((window as unknown) as Record<
string,
typeof MutationObserver
>)[angularZoneSymbol];
}
const observer = new mutationBufferCtor(
mutationBuffer.processMutations.bind(mutationBuffer),
);
observer.observe(document, {
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