Produces a GraphQL Value AST given a JavaScript object. Function will match JavaScript/JSON values to GraphQL AST schema format by using suggested GraphQLInputType. For example:

astFromValue("value", GraphQLString)

A GraphQL type must be provided, which will be used to interpret different JavaScript values.

JSON Value	GraphQL Value
Object	Input Object
Array	List
Boolean	Boolean
String	String / Enum Value
Number	Int / Float
Mixed	Enum Value
null	NullValue