Function getDecoder

lib/internal/crypto/cipher.js:94–104

(decoder, encoding)

                                      'private');

function getDecoder(decoder, encoding) {
  const normalizedEncoding = normalizeEncoding(encoding);
  decoder ||= new StringDecoder(encoding);
  if (decoder.encoding !== normalizedEncoding) {
    if (normalizedEncoding === undefined) {
      throw new ERR_UNKNOWN_ENCODING(encoding);
    }
    assert.fail('Cannot change encoding');
  }
  return decoder;
}

function getUIntOption(options, key) {
  let value;