Declare a delegate type in Typescript

Question

Coming from a C# background, I want to create a datatype that defines a function signature. In C#, this is a delegate declared like this:

delegate v         


        

Answer 1

Type definition for a callable expression (this is a draft ok, for humans... not a BNF or anything formal):

callableType: (paramsDef) => returnType

paramsDef:    MULTIPLE paramDef SEPARATED BY ,

paramDef:     EITHER   paramName: paramType
                  OR   optionalParamName?: paramTypeWhenDefined
                  OR   ...manyParamName: eachParamType[]

Example:

var func = something as ((...x: any[]) => any);

Then you can:

var result = func("a", "b", 2);