WebStorm Typescript map Promise.All不会自动解析类型

Question

问题是，当它实际上可以自动解析类型时，它会强制我在Promise.all中指定类型。 getSquares3完美运行。 getSquares在没有指定泛型参数的情况下无法工作。 我使用的是WebStorm和2.0.6 TypeScript。该代码实际上可以编译，但WebStorm投诉最后一行返回语句。 代码说千言万语。

interface IFoo{
    square:number
}
(
    async () => {

        async function square(i:number) : Promise<IFoo>{
            return Promise.resolve({square: i*i});
        }

        async function getSquares3(): Promise<IFoo[]>{
            //I like this as I don't need to use Promise.all<IFoo>
            var squares = await Promise.all([square(1), square(4)]);
            return squares;
        }

        async function getSquares(): Promise<IFoo[]>{
            var promises = [1,2,3].map(n => square(n));
            //I don't like this as I have to use Promise.all<IFoo>
            var squares = await Promise.all<IFoo>(promises);
            return squares;
        }

        squares = await getSquares3();
        squares.forEach(s => console.log('square:' + s.square));


        var squares = await getSquares();
        squares.forEach(s => console.log('square:' + s.square));

    }
)();