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Checking for content type before delete using deleteContentType

// Example of payload validation:
module.exports = function(migration) {
  const barcelonaExist = migration.editContentType("barcelona");
  if (barcelonaExist) {

here is the link which I am following.

I want to delete barcelona only if it exist.
In above example migration.deleteContentType(“barcelona”) getting called every time.

any help would be appreciated.