Function toBase64

test/fixtures/wpt/url/percent-encoding.window.js:28–33

(input)

// not use btoa directly as that only works with code points in the range U+0000 to U+00FF,
// inclusive.
function toBase64(input) {
  const bytes = new TextEncoder().encode(input);
  const byteString = Array.from(bytes, byte => String.fromCharCode(byte)).join("");
  const encoded = self.btoa(byteString);
  return encoded;
}