v12 (#5712)

Co-authored-by: MeiMei <30769358+mei23@users.noreply.github.com>
Co-authored-by: Satsuki Yanagi <17376330+u1-liquid@users.noreply.github.com>

src/client/scripts/keycode.ts

@@ -0,0 +1,33 @@
+export default (input: string): string[] => {
+	if (Object.keys(aliases).some(a => a.toLowerCase() == input.toLowerCase())) {
+		const codes = aliases[input];
+		return Array.isArray(codes) ? codes : [codes];
+	} else {
+		return [input];
+	}
+};
+
+export const aliases = {
+	'esc': 'Escape',
+	'enter': ['Enter', 'NumpadEnter'],
+	'up': 'ArrowUp',
+	'down': 'ArrowDown',
+	'left': 'ArrowLeft',
+	'right': 'ArrowRight',
+	'plus': ['NumpadAdd', 'Semicolon'],
+};
+
+/*!
+* Programatically add the following
+*/
+
+// lower case chars
+for (let i = 97; i < 123; i++) {
+	const char = String.fromCharCode(i);
+	aliases[char] = `Key${char.toUpperCase()}`;
+}
+
+// numbers
+for (let i = 0; i < 10; i++) {
+	aliases[i] = [`Numpad${i}`, `Digit${i}`];
+}