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/** Wait for the given key; if key is omitted, any key will trigger. It resolves the event. */ | |
function waitForKey(key){ | |
return new Promise(resolve => { | |
var onkeydown = e => { | |
if(typeof key === 'undefined' || e.key === key){ | |
document.removeEventListener('keydown', onkeydown); | |
resolve(e); | |
} | |
}; | |
document.addEventListener('keydown', onkeydown); |
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