Function base64url

packages/core/test-servers/src/worker.test.ts:73–78

(buffer: ArrayBuffer)

};

const base64url = (buffer: ArrayBuffer): string => {
  const bytes = new Uint8Array(buffer);
  let binary = "";
  for (const byte of bytes) binary += String.fromCharCode(byte);
  return btoa(binary).replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/g, "");
};

const codeChallengeForVerifier = (verifier: string): Promise<string> =>
  crypto.subtle.digest("SHA-256", new TextEncoder().encode(verifier)).then(base64url);