Specifying Eclipse / JSDT Javascript Variable Type

Question

I am trying to use Eclipse to develop server side Javascript.

The API I use has a function doStuff(string, object)(names changed to protect the perpetrators) that returns the value of different types (subclasses of the same type) depending on the (values) of the arguments passed to them.

I created a Javascript library to describe this function:

/**
  * function doStuff(s, o)
  * @memberOf Global
  * @param {String} s
  * @param {Object} o
  * @type ResultType
  * @returns {ResultType}
  */
doStuff = function(str, obj} {return new ResultType();}

Since it can return multiple types, I declared it to return the base type. However, this means that Eclipse does not know what type it actually is, and therefore I get later false errors when trying to access the fields of this object.

So there could be FooResultType, BarResultType, each of which is ResultTypes, but has additional fields / functions

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( FooResultType)

/**
  * @type FooResultType
  */
  v = doStuff("stringvalue", someObject);

.

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Answer 1

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/**
  * @returns {FooResultType}
  */
  var v = doStuff("stringvalue", someObject);

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