function encodeUrlSafeBase64NoPadding_(value) {
  var encodedValue = Utilities.base64EncodeWebSafe(value);
  encodedValue = encodedValue.slice(0, encodedValue.indexOf('='));
  return encodedValue;
}
Wrapper around base64 encoded to strip padding.
@param {string} value
@return {string} Web safe base64 encoded with padding removed.