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prettier Show F.js Source code

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  1. // You should be able to use an arrow function as an object with a call property
  2.  
  3. var a: { (x: number): string } = (x) => x.toString()
  4.  
  5. // ...and it should notice when the return type is wrong
  6. var b: { (x: number): number } = (x) => "hi"
  7.  
  8. // ...or if the param type is wrong
  9. var c: { (x: string): string } = (x) => x.toFixed()
  10.  
  11. // ...or if the arity is wrong
  12. var d: { (): string } = (x) => "hi"
  13.  
  14. // ...but subtyping rules still apply
  15. var e: { (x: any): void } = () => { } // arity
  16. var f: { (): mixed } = () => "hi" // return type
  17. var g: { (x: Date): void } = (x) => { x * 2 } // param type (date < number)
  18.  
  19. // A function can be an object
  20. var y : {} = (x) => "hi"
  21. var z : Object = (x) => "hi"
  22.  
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