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Viewing file:     isBase64.js (935 B)      -rw-r--r--

import assertString from './util/assertString';
import merge from './util/merge';
var base64WithPadding = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/;
var base64WithoutPadding = /^[A-Za-z0-9+/]+$/;
var base64UrlWithPadding = /^(?:[A-Za-z0-9_-]{4})*(?:[A-Za-z0-9_-]{2}==|[A-Za-z0-9_-]{3}=|[A-Za-z0-9_-]{4})$/;
var base64UrlWithoutPadding = /^[A-Za-z0-9_-]+$/;
export default function isBase64(str, options) {
  var _options;
  assertString(str);
  options = merge(options, {
    urlSafe: false,
    padding: !((_options = options) !== null && _options !== void 0 && _options.urlSafe)
  });
  if (str === '') return true;
  var regex;
  if (options.urlSafe) {
    regex = options.padding ? base64UrlWithPadding : base64UrlWithoutPadding;
  } else {
    regex = options.padding ? base64WithPadding : base64WithoutPadding;
  }
  return (!options.padding || str.length % 4 === 0) && regex.test(str);
}