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fix: check if document is truthy before create node #866

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2 changes: 1 addition & 1 deletion packages/core-js/internals/microtask.js
Expand Up @@ -39,7 +39,7 @@ if (!queueMicrotask) {
process.nextTick(flush);
};
// browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
} else if (MutationObserver && !IS_IOS) {
} else if (MutationObserver && !IS_IOS && document) {
toggle = true;
node = document.createTextNode('');
new MutationObserver(flush).observe(node, { characterData: true });
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