=== tests/cases/compiler/inferentiallyTypingAnEmptyArray.ts === // April 2014, Section 4.6: // In the absence of a contextual type, the type of an array literal is C[], where C is the // Undefined type(section 3.2.6) if the array literal is empty, or the best common type of // the element expressions if the array literal is not empty. // When an array literal is contextually typed(section 4.19) by an object type containing a // numeric index signature of type T, each element expression is contextually typed by T and // the type of the array literal is the best common type of T and the types of the element // expressions. // // While the spec does not say it, an inferential type causes an empty array literal to have // the undefined[] type. In other words, the first clause from the excerpt above applies even // though there is a "contextual type" present. This is the intention, even though the spec // seems to imply the contrary. // Therefore, the following access to bar should not cause an error because we infer // the undefined[] type. declare function foo(arr: T[]): T; >foo : (arr: T[]) => T >T : T >arr : T[] >T : T >T : T foo([]).bar; >foo([]).bar : any >foo([]) : any >foo : (arr: T[]) => T >[] : undefined[] >bar : any