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fix: Ensure CSS support is checked more robustly #42

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Merged
merged 1 commit into from
Feb 3, 2023
Merged

fix: Ensure CSS support is checked more robustly #42

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32 changes: 28 additions & 4 deletions packages/rrweb/src/record/observer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -53,10 +53,34 @@ type WindowWithAngularZone = IWindow & {

export const mutationBuffers: MutationBuffer[] = [];

const isCSSGroupingRuleSupported = typeof CSSGroupingRule !== 'undefined';
const isCSSMediaRuleSupported = typeof CSSMediaRule !== 'undefined';
const isCSSSupportsRuleSupported = typeof CSSSupportsRule !== 'undefined';
const isCSSConditionRuleSupported = typeof CSSConditionRule !== 'undefined';
function isCSSStyleSheetMonkeyPatchable(
prop:
| 'CSSGroupingRule'
| 'CSSMediaRule'
| 'CSSSupportsRule'
| 'CSSConditionRule',
): boolean {
return Boolean(
typeof window[prop] !== 'undefined' &&
// Note: Generally, this check _shouldn't_ be necessary
// However, in some scenarios (e.g. jsdom) this can sometimes fail, so we check for it here
window[prop].prototype &&
// @ts-ignore ensure it is actually set
window[prop].prototype.insertRule &&
window[prop].prototype.deleteRule
);
}

const isCSSGroupingRuleSupported = isCSSStyleSheetMonkeyPatchable(
'CSSGroupingRule',
);
const isCSSMediaRuleSupported = isCSSStyleSheetMonkeyPatchable('CSSMediaRule');
const isCSSSupportsRuleSupported = isCSSStyleSheetMonkeyPatchable(
'CSSSupportsRule',
);
const isCSSConditionRuleSupported = isCSSStyleSheetMonkeyPatchable(
'CSSConditionRule',
);

// Event.path is non-standard and used in some older browsers
type NonStandardEvent = Omit<Event, 'composedPath'> & {
Expand Down