How to use the undef function from is

Find comprehensive JavaScript is.undef code examples handpicked from public code repositorys.

api.js

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if (api) {
  return;
}

const apiConf = config.get('api');
if (!config.isValid() || is.undef(apiConf) || is.empty(apiConf)) {
  throw new Error('Global config is not valid. Please use the \'config-tuya\' command first.');
}

api = new Cloud({

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