console.log(js({a:4, b: "hello"}))

js.nim

import std/genasts
import std/jsconsole
import std/strutils
import std/macros
import std/tables
import std/strformat
import std/sequtils
from std/jsffi import JsObject

macro js*(args: untyped): untyped =
    args.expectKind nnkTableConstr
    var argsWithType = ""
    var argsWithOutType = ""
    var jscode = ""
    for arg in args:
      let ntype = case arg[1].kind
      of nnkIntLit:
        "int"
      of nnkStrLit:
        "string"
      else:
         "create a pr!!!"

      let ele = arg.repr.split(": ")
      let id = ele[0]
      let value = ele[1]
      argsWithType.add(&"{id}: {ntype}, ")
      argsWithOutType.add(&"{value}, ")
      jscode.add(&"{id}: {value}, ")
    
    jscode = jscode.replace('"','\'')
    jscode = &"{{ {jscode}  }} /*@*/"
    
    let procJs= parseStmt(&"proc toJs({argsWithType}): JsObject {{.importjs: \"{jscode}\".}}")
    let procInvoke = parseStmt(&"toJs({argsWithOutType})")
        
    quote do:
        `procJs`
        `procInvoke`


console.log(js({a:4, b: "hello"}))