How to check the type of a js value, such as whether it is undefined

[2A5F]

Now it can only be converted into a string to check

var some = rt.Evaluate("");
some.ToString() == "[undefined]"

Can you provide an API that returns JsValue instead of just dynamic

[2A5F]

Well, I found that some == Undefined.Value, but other types seem to be unable to check

[ClearScriptLib]

Hello @2A5F,

Can you provide an API that returns JsValue instead of just dynamic

ClearScript doesn't have such APIs because (a) scripts can return .NET values as well as script values, and (b) ClearScript's API is designed to support languages other than JavaScript.

You can use this summary to identify and interact with data returned from script code:

• All .NET values are returned in their native .NET form.
• Script numeric, Boolean, and string values are converted to their equivalent .NET types.
• JavaScript undefined is converted to Undefined.Value.
• All script objects implement IScriptObject.
• [V8] JavaScript BigInt is converted to BigInteger.
• [V8] All JavaScript objects implement IJavaScriptObject, which provides additional type information.
• [V8] Generic JavaScript objects implement IDictionary<string, object>.
• [V8] JavaScript arrays implement IList and IList<object>.
• [V8] JavaScript array buffers implement IArrayBuffer.
• [V8] JavaScript data views implement IDataView.
• [V8] JavaScript typed arrays implement ITypedArray<T>.

Good luck!