Function getModifierState

src/tinykeys.ts:151–156

* There's a bug in Chrome that causes event.getModifierState not to exist on * KeyboardEvent's for F1/F2/etc keys.

(event: KeyboardEvent, mod: string)

 * KeyboardEvent's for F1/F2/etc keys.
 */
function getModifierState(event: KeyboardEvent, mod: string) {
	return typeof event.getModifierState === "function"
		? event.getModifierState(mod) ||
				(ALT_GRAPH_ALIASES.includes(mod) && event.getModifierState("AltGraph"))
		: false
}

/**
 * Parses a keybinding string into its parts.