Sure, here is the map in JavaScript for the data provided which uses the country code as the key and the country name as the value

const countryCodeToNameMap = new Map([ 
  ['AF', 'Afghanistan'], 
  ['AX', 'Åland Islands'], 
  ['AL', 'Albania'], 
  ['DZ', 'Algeria'], 
  ['AS', 'American Samoa'], 
  ['AD', 'AndorrA'], 
  ['AO', 'Angola'], 
  ['AI', 'Anguilla'], 
  ['AQ', 'Antarctica'], 
  ['AG', 'Antigua and Barbuda'], 
  ['AR', 'Argentina'], 
  ['AM', 'Armenia'], 
  ['AW', 'Aruba'], 
  ['AU', 'Australia'], 
  ['AT', 'Austria'], 
  ['AZ', 'Azerbaijan'], 
  ['BS', 'Bahamas'], 
  ['BH', 'Bahrain'], 
  ['BD', 'Bangladesh'], 
  ['BB', 'Barbados'], 
  ['BY', 'Belarus'], 
  ['BE', 'Belgium'], 
  ['BZ', 'Belize'], 
  ['BJ', 'Benin'], 
  ['BM', 'Bermuda'], 
  ['BT', 'Bhutan'], 
  ['BO', 'Bolivia'], 
  ['BA', 'Bosnia and Herzegovina'], 
  ['BW', 'Botswana'], 
  ['BV', 'Bouvet Island'], 
  ['BR', 'Brazil'], 
  ['IO', 'British Indian Ocean Territory'], 
  ['BN', 'Brunei Darussalam'], 
  ['BG', 'Bulgaria'], 
  ['BF', 'Burkina Faso'], 
  ['BI', 'Burundi']
]);
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