26 lines
865 B
Plaintext
26 lines
865 B
Plaintext
"use strict";
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var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports["default"] = void 0;
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var _isBrowser = _interopRequireDefault(require("../../../utils/isBrowser"));
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var _isDocumentVisible = _interopRequireDefault(require("./isDocumentVisible"));
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var listeners = new Set();
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function subscribe(listener) {
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listeners.add(listener);
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return function unsubscribe() {
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listeners.has(listener) && listeners["delete"](listener);
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};
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}
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if (_isBrowser["default"]) {
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var revalidate = function revalidate() {
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if (!(0, _isDocumentVisible["default"])()) return;
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listeners.forEach(function (listener) {
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return listener();
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});
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};
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window.addEventListener('visibilitychange', revalidate, false);
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}
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var _default = exports["default"] = subscribe; |