code: function openWallet(filename) {
    try {
      // Delete the cached copy of the wallet. This allows testing of list-wallets.
      delete require.cache[require.resolve(filename)]
  
      const walletInfo = require(filename)
      return walletInfo
    } catch (err) {
      throw new Error(`Could not open ${filename}`)
    }
  }
docs: Open a wallet by file name.