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Fix ESM XHR instrumentation tree shaking #2768

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Merged
Hector Hernandez (hectorhdzg) merged 1 commit into from
Sep 8, 2026
Merged

Fix ESM XHR instrumentation tree shaking #2768

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3 changes: 2 additions & 1 deletion shared/AppInsightsCore/src/utils/EnvUtils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -290,7 +290,8 @@ export function useXDomainRequest(): boolean | undefined {
* Checks if XMLHttpRequest is supported
* @returns True if supported, otherwise false
*/
/*#__NO_SIDE_EFFECTS__*/
// Do not mark this function as side-effect-free. Rollup can remove capability checks
// guarded by this return value, which prevents XHR instrumentation from being installed.
export function isXhrSupported(): boolean {
let isSupported = false;
try {
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