type
  JDict*[K, V] = ref object

proc `[]`*[K, V](d: JDict[K, V], k: K): V {.importcpp: "#[#]".}
proc `[]=`*[K, V](d: JDict[K, V], k: K, v: V) {.importcpp: "#[#] = #".}

proc newJDict*[K, V](): JDict[K, V] {.importcpp: "{@}".}

proc contains*[K, V](d: JDict[K, V], k: K): bool {.importcpp: "#.hasOwnProperty(#)".}

proc del*[K, V](d: JDict[K, V], k: K) {.importcpp: "delete #[#]".}