KeyboardEvent Key: Polyfill the correct key names in Internet Explorer (577 bytes / 385 bytes gzipped)

keyboard-key.js

!function () {
	let KeyboardEventPrototype = KeyboardEvent.prototype
	let KeyboardEventPrototypeKeyDescriptor = Object.getOwnPropertyDescriptor(KeyboardEventPrototype, 'key')
	let KeyboardEventPrototypeKeyGetter = KeyboardEventPrototypeKeyDescriptor.get
	KeyboardEventPrototypeKeyDescriptor.get = function () {
		return {
			27: 'Escape',
			29: 'NonConvert',
			32: ' ',
			37: 'ArrowLeft',
			38: 'ArrowUp',
			39: 'ArrowRight',
			40: 'ArrowDown',
			46: 'Delete',
			72: 'AudioVolumeUp',
			73: 'AudioVolumeDown',
			74: 'AudioVolumeMute',
			91: 'Meta',
			92: 'Meta',
			93: 'ContextMenu',
			95: 'Standby',
			145: 'ScrollLock',
			176: 'MediaTrackNext',
			177: 'MediaTrackPrevious',
			181: 'LaunchMediaPlayer',
			229: 'Process',
			240: 'Attn',
			241: 'Finish',
			244: 'Zenkaku',
			247: 'CrSel',
			248: 'ExSel',
			251: 'ZoomToggle'
		}[this.which] || KeyboardEventPrototypeKeyGetter.call(this)
	}
	Object.defineProperty(KeyboardEventPrototype, 'key', KeyboardEventPrototypeKeyDescriptor)
}()