Convert a letter to associate emoji

JavaScript version
const letterToEmoji = (c) => String.fromCodePoint(c.toLowerCase().charCodeAt(0) + 127365);
TypeScript version
const letterToEmoji = (c: string): string => String.fromCodePoint(c.toLowerCase().charCodeAt(0) + 127365);
Examples
letterToEmoji('a'); // 🇦
letterToEmoji('b'); // 🇧