Drop TextEncoder requirement

The need for TextEncoder is limited and it is not supported (without expensive polyfills) on IE or Edge.

It is easily replaced as follows:

// modified from source: http://stackoverflow.com/a/11058858
export function str2ab(str: string) {
  const buf = new ArrayBuffer(str.length);
  const bufView = new Uint8Array(buf);
  for (let i = 0; i < str.length; i++) {
    bufView[i] = str.charCodeAt(i);
  }
  return buf;
}

crypto.subtle.digest('SHA-256', str2ab(code))

[tikurahul]

Sorry about the delay. Have been swamped with a lot of other things.

AppAuth-JS 1.1.2 is now live. https://www.npmjs.com/package/@openid/appauth

Now uses TypeScript 3.2.1.

[jurepurgar]

OK great. Let us know when it is available 😃