@polkadot/util/is/testChain.js

// Copyright 2017-2022 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
const REGEX_DEV = /(Development|Local Testnet)$/;
export function isTestChain(chain) {
  if (!chain) {
    return false;
  }

  return !!REGEX_DEV.test(chain.toString());
}