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// eslint-disable-next-line func-names
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(function() {
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'use strict';
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let windowFocused = false;
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window.addEventListener('blur', () => {
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windowFocused = false;
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});
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window.addEventListener('focus', () => {
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windowFocused = true;
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});
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window.isFocused = () => windowFocused;
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})();
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