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require(`yargs`)
  .demand(1)
  .command(
    `detect <input..>`,
    `Detects the language of one or more strings.`,
    {},
    (opts) => detectLanguage(opts.input)
  )
  .command(
    `list [target]`,
    `Lists available translation languages. To return language names in a language other than English, specify a target language.`,
    {},
    (opts) => {
      if (opts.target) {
        listLanguagesWithTarget(opts.target);
      } else {
        listLanguages();
      }
    }
  )
  .command(
    `translate <toLang> <input..>`,
    `Translates one or more strings into the target language.`,
    {},
    (opts) => translateText(opts.input, opts.toLang)
  )
  .command(
    `translate-with-model <toLang> <model> <input..>`,
    `Translates one or more strings into the target language using the specified model.`,
    {},
    (opts) => translateTextWithModel(opts.input, opts.toLang, opts.model)
  )
  .example(`node $0 detect "Hello world!"`, `Detects the language of a string.`)
  .example(`node $0 detect "Hello world!" "Goodbye"`, `Detects the languages of multiple strings.`)
  .example(`node $0 list`, `Lists available translation languages with names in English.`)
  .example(`node $0 list es`, `Lists available translation languages with names in Spanish.`)
  .example(`node $0 translate ru "Good morning!"`, `Translates a string into Russian.`)
  .example(`node $0 translate ru "Good morning!" "Good night!"`, `Translates multiple strings into Russian.`)
  .example(`node $0 translate-with-model ru nmt "Good morning!" "Good night!"`, `Translates multiple strings into Russian using the Premium model.`)
  .wrap(120)
  .recommendCommands()
  .epilogue(`For more information, see https://cloud.google.com/translate/docs`)
  .help()
  .strict()
  .argv;