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  1. // @flow
  2.  
  3. // misc basic
  4.  
  5. function test1() {
  6.   async function foo() {
  7.     return 42;
  8.   }
  9.  
  10.   async function bar() {
  11.     var a = await foo();
  12.     var b: number = a; // valid
  13.     var c: string = a; // Error: number ~> string
  14.   }
  15. }
  16.  
  17. //
  18. // void returns:
  19. //
  20.  
  21. // inference should produce return type Promise<void>
  22. // in the absence of an explicit return
  23. //
  24.  
  25. function test2() {
  26.   async function voidoid1() {
  27.     console.log("HEY");
  28.   }
  29.  
  30.   var voidoid2: () => Promise<void> = voidoid1; // ok
  31.  
  32.   var voidoid3: () => void = voidoid1; // error, void != Promise<void>
  33. }
  34.  
  35. // annotated return type of Promise<void> should work
  36. //
  37.  
  38. function test3() {
  39.   async function voidoid4(): Promise<void> { // ok
  40.     console.log("HEY");
  41.   }
  42. }
  43.  
  44. // other annotated return types should fail
  45. // (note: misannotated return types with explicit
  46. // return statements are covered in async.js)
  47. //
  48.  
  49. function test4() {
  50.   async function voidoid5(): void { // error, void != Promise<void>
  51.     console.log("HEY");
  52.   }
  53. }
  54.  
  55. function test5() {
  56.   async function voidoid6()
  57.   : Promise<number> { // error, number != void
  58.     console.log("HEY");
  59.   }
  60. }
  61.  
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