toJsObject
Convert a map to a Plain Old JavaScript Object by transforming the keys to strings and the values to any of the JavaScript types. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#javascript_types
Parameters
transform
called on each entry to effect a mapping to a JavaScript Object. This function must convert the key to a string as Javascript Object keys are always strings. The value may be converted to an appropriate type as required.