Function signature with return type in typescript

example.ts

// This function takes two params and returns a variable of type Immutable.Map<String, any>. 
// Function is just for explaining the format of a function in typescript. Functionally this function does not do anything :)
// param1 : Type is Immutable.Map<String, any>
// param2 : Type is number
// returns a value of type Immutable.Map<Strin, any>

const functionVar = (param1: Immutable.Map<String, any>, param2: number): Immutable.Map<String, any> => {  
  return state;
};