Based on function documented on [](https://stackoverflow.com/questions/48928932/call-library-function-from-html-with-google-script-run) with some enhancements for my usecase.

callLibraryFunction.gs

// Function - callLibraryFunction
// based on function documented on
// https://stackoverflow.com/questions/48928932/call-library-function-from-html-with-google-script-run
// with some enhancements for my usecase.
//
function callLibraryFunction(functionPathAndName, ...args){

    let fnPathArray = functionPathAndName.split(".");
    let fnPathLength = fnPathArray.length
    let libFunc = fnPathArray[fnPathArray.length - 1];
    let argLength = args.length
    
    // check - library loaded
    libraryPath1 = "typeof " + fnPathArray[0]
    libraryPath1Type = eval(libraryPath1)
    if (libraryPath1Type !== 'object') {
      console.error("Library not found - " + fnPathArray[0])
      return false
    }

    // check - deconstruct array if size 1
    // because it could mean that this is a string
    if (argLength = 1){
      args = args[0]
    }

    // check - if arg is an actual array, label it is an array
    let argType = typeof args
    // check if args is an array
    if (argType === 'object') {
      let validArray = Array.isArray(args)
      if (validArray){
        argType = 'array'
      }
    }
    
  // Old school way of debugging  
  // console.log({functionPathAndName, args, fnPathArray, fnPathLength, libFunc, argLength, argType})
  
    // Retun by triggering function
    if (fnPathLength === 3){
      return this[fnPathArray[0]][fnPathArray[1]][libFunc].call(this, args);
    }
    if (fnPathLength === 2){
      return this[fnPathArray[0]][libFunc].call(this, args);
    }
    else {
      console.error("Incompatible number of libraries... STAP!")
      throw new Error({functionPathAndName, args, fnPathArray, fnPathLength, libFunc, argLength, argType})
    } 
}

function test_callLibraryFunction(){
  
  let argsObj = {"hello":"mello","tello":"sello"}
  let argsArr = ["hello","mello","sello"]
  let argsStr = '1,2,3,4'
  let result = ""
  
  result = LibraryLayer1.SubLibrary1.ping(argsArr)
  console.log({result})

  result = callLibraryFunction("LibraryLayer1.SubLibrary1.ping",argsObj)
  console.log({result})
  
  result = callLibraryFunction("LibraryLayer1.SubLibrary1.ping",argsArr)
  console.log({result})
  
  result = callLibraryFunction("LibraryLayer1.SubLibrary1.ping",argsStr)
  console.log({result})
  
  result = callLibraryFunction("LibraryLayer1.SubLibrary1.ping",1,2,3,4,5)
  console.log({result})

  result = callLibraryFunction("LibraryLayer1.SubLibrary1.ping")
  console.log({result})
}

• TODO: Notes about this function