在 function 回调处理程序上断言 javascript object 的架构

Question

I have an object with structure like this: {prop_1: function_1, prop_n: function_n} . I use jest to unit-test my code, which you may check here: https://jestjs.io .

Functions provided by prop_${i} have some requirement object {prop_1:requirementCallback_1, prop_n: requirementCallback_n} needed such that requirementCallback_${i} , for example, that given function returns a defined value or it asserts some expected number of input arguments. Therefore, it is advisable from my point of view that we run requirement values against function_{i} to verify such conditions.

I am not familiar to Typescript, but its name suggests that the language may have some out-of-the-box solution to check such conditions. What do you think about this scenario?

Answer 1

Does the object have dynamic properties? then try:

//change void to your appropriate return type
type MyObjectType = Record<string, (someStringArg: string, someNumberArg: number) => void >

If you are trying to have defined properties with same funtion types then try:

type SameFunctionType = (string_arg1: string, number_arg2: number)=>void//or any return type for the function
interface MyObjectType{
  prop_1: SameFunctionType;
  prop_n: SameFunctionType;
}

If you are trying to have defined properties with different funtion types then try:

interface MyObjectType{
  prop_1: ()=>number;
  prop_2: (arg1: Date)=>number;
}