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prettier Show constructor.js Source code

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  1. class C {
  2.     constructor() { }
  3. }
  4.  
  5. class D {
  6.     constructor():number { }
  7. }
  8.  
  9. // the return type of a constructor overrides the type of the class
  10. declare class Bar<T> {}
  11. declare class Foo<T> {
  12.   constructor<U>(iterable: U): Bar<U>;
  13. }
  14. (new Foo('x'): Bar<string>); // ok
  15. (new Foo(123): Bar<string>); // error, number !~> string
  16.  
  17. // also overrides when it returns a different specialization of the same class
  18. declare class Baz<T> {
  19.   constructor<U>(iterable: U): Baz<U>;
  20. }
  21. (new Baz('x'): Baz<string>); // ok
  22. (new Baz(123): Baz<string>); // error, number !~> string
  23.  
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