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prettier Show spread.js Source code

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  1. // @flow
  2.  
  3. function fun(x: 'hi', y: 123) {}
  4. fun(...['hi', 123]); // No error
  5. fun(...['hi'], ...[123]); // No error
  6. fun(...['hi'], ...[], ...[123]); // No error
  7. fun(...['hi'], ...[], ...[123], ...[true]); // Error - true is unused
  8. fun(...['hi'], ...[true], ...[123]); // Error: true ~> 123 and 123 is unused
  9.  
  10. declare var arrOf123: Array<123>;
  11. fun('hi', ...arrOf123); // No error - ignore the fact arrOf123 could be empty
  12.  
  13.  
  14. function funWithRestArray(x: 'hi', y: 123, ...rest: Array<number>) {}
  15. funWithRestArray(...['hi', 123]); // No error
  16. funWithRestArray(...['hi'], ...[123]); // No error
  17. funWithRestArray(...['hi'], ...[], ...[123]); // No error
  18. funWithRestArray(...['hi'], ...[], ...[123], ...[456, 789]); // No error
  19. funWithRestArray(...['hi'], ...[true], ...[123]); // Error: true ~> 123
  20.  
  21. funWithRestArray('hi', 123, ...arrOf123); // Ok
  22. funWithRestArray('hi', ...arrOf123); // No error - ignore the fact arrOf123 could be empty
  23. funWithRestArray('hi', ...arrOf123, ...arrOf123); // No error - ignore the fact arrOf123 could be empty
  24.  
  25. // 2 errors
  26. // 1. 'bye' ~> 123 in case the first spread is empty
  27. // 2. 'bye' ~> number in case the first spread is not empty
  28. funWithRestArray('hi', ...arrOf123, 'bye', ...arrOf123);
  29.  
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