const DIGEST_ALGORITHM = "SHA-256";
const HEX_RADIX = 16;
const HEX_WIDTH = 2;
const HEX_PAD = "0";

const hexOf = function hexOf(bytes: ArrayBuffer): string {
    return [...new Uint8Array(bytes)].map((byte) => byte.toString(HEX_RADIX).padStart(HEX_WIDTH, HEX_PAD)).join("");
};

export const diagramDigest = async function diagramDigest(source: string): Promise<string> {
    return hexOf(await crypto.subtle.digest(DIGEST_ALGORITHM, new TextEncoder().encode(source)));
};