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tests/cases/compiler/promiseChaining1.ts(7,50): error TS2345: Argument of type '(x: S) => string' is not assignable to parameter of type '(x: S) => Function'.
Type 'string' is not assignable to type 'Function'.
==== tests/cases/compiler/promiseChaining1.ts (1 errors) ====
// same example but with constraints on each type parameter
class Chain2<T extends { length: number }> {
constructor(public value: T) { }
then<S extends Function>(cb: (x: T) => S): Chain2<S> {
var result = cb(this.value);
// should get a fresh type parameter which each then call
var z = this.then(x => result)/*S*/.then(x => "abc")/*Function*/.then(x => x.length)/*number*/; // Should error on "abc" because it is not a Function
~~~~~~~~~~
!!! error TS2345: Argument of type '(x: S) => string' is not assignable to parameter of type '(x: S) => Function'.
!!! error TS2345: Type 'string' is not assignable to type 'Function'.
return new Chain2(result);
}
}
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