asyncArrowFunction8_es5.errors.txt

tests/cases/conformance/async/es5/asyncArrowFunction/asyncArrowFunction8_es5.ts(1,21): error TS1055: Type 'PromiseConstructor' is not a valid async function return type in ES5/ES3 because it does not refer to a Promise-compatible constructor value.
  Type 'Promise<T | (T extends PromiseLike<infer U> ? U : T)>' is not assignable to type 'PromiseLike<T>'.
    Types of property 'then' are incompatible.
      Type '<TResult1 = T | (T extends PromiseLike<infer U> ? U : T), TResult2 = never>(onfulfilled?: (value: T | (T extends PromiseLike<infer U> ? U : T)) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>) => Promise<TResult1 | TResult2>' is not assignable to type '<TResult1 = T, TResult2 = never>(onfulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>) => PromiseLike<TResult1 | TResult2>'.
        Types of parameters 'onfulfilled' and 'onfulfilled' are incompatible.
          Types of parameters 'value' and 'value' are incompatible.
            Type 'T | (T extends PromiseLike<infer U> ? U : T)' is not assignable to type 'T'.
              'T | (T extends PromiseLike<infer U> ? U : T)' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.
                Type 'T extends PromiseLike<infer U> ? U : T' is not assignable to type 'T'.
                  'T extends PromiseLike<infer U> ? U : T' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.
                    Type 'unknown' is not assignable to type 'T'.
                      'unknown' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.
tests/cases/conformance/async/es5/asyncArrowFunction/asyncArrowFunction8_es5.ts(2,19): error TS1109: Expression expected.


==== tests/cases/conformance/async/es5/asyncArrowFunction/asyncArrowFunction8_es5.ts (2 errors) ====
    var foo = async (): Promise<void> => {
                        ~~~~~~~~~~~~~
!!! error TS1055: Type 'PromiseConstructor' is not a valid async function return type in ES5/ES3 because it does not refer to a Promise-compatible constructor value.
!!! error TS1055:   Type 'Promise<T | (T extends PromiseLike<infer U> ? U : T)>' is not assignable to type 'PromiseLike<T>'.
!!! error TS1055:     Types of property 'then' are incompatible.
!!! error TS1055:       Type '<TResult1 = T | (T extends PromiseLike<infer U> ? U : T), TResult2 = never>(onfulfilled?: (value: T | (T extends PromiseLike<infer U> ? U : T)) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>) => Promise<TResult1 | TResult2>' is not assignable to type '<TResult1 = T, TResult2 = never>(onfulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>) => PromiseLike<TResult1 | TResult2>'.
!!! error TS1055:         Types of parameters 'onfulfilled' and 'onfulfilled' are incompatible.
!!! error TS1055:           Types of parameters 'value' and 'value' are incompatible.
!!! error TS1055:             Type 'T | (T extends PromiseLike<infer U> ? U : T)' is not assignable to type 'T'.
!!! error TS1055:               'T | (T extends PromiseLike<infer U> ? U : T)' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.
!!! error TS1055:                 Type 'T extends PromiseLike<infer U> ? U : T' is not assignable to type 'T'.
!!! error TS1055:                   'T extends PromiseLike<infer U> ? U : T' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.
!!! error TS1055:                     Type 'unknown' is not assignable to type 'T'.
!!! error TS1055:                       'unknown' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.
      var v = { [await]: foo }
                      ~
!!! error TS1109: Expression expected.
    }