Example of how to add a custom function with signature using constants

[VentuzVictorPerez]

Hi there,

I need to add a custom function to the JSONFormula instance. While I have been able to define and add the function, I'm having trouble specifying the data types for the function signature using the constants such as "TYPE_STRING" as I am unable to import it.

Expected Behaviour

"dataTypes" must be imported in some way.

Actual Behaviour

I am not able to import dataTypes constants.

Sample Code that illustrates the problem

I installed the package using NPM:

npm install @adobe/json-formula

import JsonFormula, { dataTypes }  from "@adobe/json-formula"; //  "import JsonFormula, { TYPE_STRING }  from "@adobe/json-formula";" also does not work.

function test () {
    
    const customFunctions = {
        myFunc: {
          _func: resolvedArgs => console.log(resolvedArgs[0]),
          _signature: [{ types: [dataTypes.TYPE_STRING] }] // <= "dataTypes" is not imported resulting in "undefined", using a '2' works though.
        }
      };

    const instance = new JsonFormula(customFunctions, 'null', []);
}

Could you please provide an example of how to add custom signatured functions?

Thanks!