svelte/src/utils/fullCharCodeAt.ts

// Adapted from https://github.com/acornjs/acorn/blob/6584815dca7440e00de841d1dad152302fdd7ca5/src/tokenize.js
// Reproduced under MIT License https://github.com/acornjs/acorn/blob/master/LICENSE

export default function fullCharCodeAt(str: string, i: number): number {
	let code = str.charCodeAt(i)
	if (code <= 0xd7ff || code >= 0xe000) return code;

	let next = str.charCodeAt(i + 1);
	return (code << 10) + next - 0x35fdc00;
}