| 1 | /**
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| 2 | * @param {?} type
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| 3 | * @param {?=} detail
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| 4 | * @param {?=} params
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| 5 | * @return {?}
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| 6 | */
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| 7 | export function CustomEvent(type, detail, params) {
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| 8 | if (detail === void 0) { detail = undefined; }
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| 9 | if (params === void 0) { params = { bubbles: false, cancelable: false }; }
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| 10 | var /** @type {?} */ event = document.createEvent('CustomEvent');
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| 11 | event.initCustomEvent(type, params.bubbles, params.cancelable, detail);
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| 12 | return event;
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| 13 | }
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| 14 | if ("Event" in window) {
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| 15 | CustomEvent.prototype = ((window)).Event.prototype;
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| 16 | }
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