How to Flow annotate a function that returns different types depending on parameters

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See example https://flow.org/try/#0PQKgBAAgZgNg9gdzAZwC4CcCWBjVYTABQhUArgHa6ZzlhSbkAmA8ugEoCmqp65AwnAqoAFAG9sg8qgC+ALjDjJqAPzyARnDgwOAQ3LSwAXgXSAlPICC6dDoCeAHmZqAVh1wA+MAB8w