26 lines
663 B
JavaScript
26 lines
663 B
JavaScript
// @flow
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let listener: EventListener = function (event: Event) :void {};
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let tests = [
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// attachEvent
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function() {
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let target = new EventTarget();
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(target.attachEvent('foo', listener): void); // invalid, may be undefined
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(target.attachEvent && target.attachEvent('foo', listener): void); // valid
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},
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// detachEvent
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function() {
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let target = new EventTarget();
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(target.detachEvent('foo', listener): void); // invalid, may be undefined
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(target.detachEvent && target.detachEvent('foo', listener): void); // valid
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},
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function() {
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window.onmessage = (event: MessageEvent) => {
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(event.target: window);
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};
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},
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];
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