Function .toString() does not contain the arguments of the function.

[dkgof]

Running the code:

let testMethod = (a,b)=>{return a+b;};
console.log(testMethod.toString());

Results in the output:

"function testMethod() { [native code] }"

Same code run in chrome devtools outputs:

"(a,b)=>{return a+b;}"

It would be very nice if the arguments a and b were present, so it would be possible to detect arguments of a function programatically.

Or is this somehow possible in another way in jint?

[dkgof]

I found a way to work around it, by exposing a c# method to js, and using reflection to find the parameters:

engine.SetValue("getFunctionArguments", new Func<Delegate, string[]>((function)=>{
    List<string> foundParameters = new List<string>();
    foreach(var info in function.Target.GetType().GetProperties()) {
        if(info.Name == "FunctionDeclaration") {
            Esprima.Ast.IFunction functionDeclaration = (Esprima.Ast.IFunction) info.GetValue(function.Target);
            foreach(var param in functionDeclaration.Params.ToArray()) {
                foundParameters.Add(param.ToString());
            }
        }
    }
    return foundParameters.ToArray();
}));

Calling getFunctionArguments from JS, with the function i need arguments for, returns my wanted array of argument names.