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com/google/javascript/jscomp/TightenTypes$NativeCallFunctionCall.java

getAssignments(ConcreteScope)

class TightenTypes.NativeCallFunctionCall {
    public Collection<Assignment> getAssignments(ConcreteScope scope) {
      ConcreteType thisType = (firstArgument != null)
          ? inferConcreteType(scope, firstArgument)
          : getTopScope().getTypeOfThis();
      ConcreteType recvType = inferConcreteType(scope, receiver);

      if (recvType instanceof ConcreteInstanceType &&
          ((ConcreteInstanceType) recvType).isFunctionPrototype()) {
        recvType = thisType.getPropertyType(propName);
      }
      List<ConcreteType> argTypes = Lists.newArrayList();
      // Skip the first argument for call() as it is the 'this' object.
      for (Node arg = firstArgument.getNext();
           arg != null;
           arg = arg.getNext()) {
        argTypes.add(inferConcreteType(scope, arg));
      }
      return getFunctionCallAssignments(recvType, thisType, argTypes);
    }

}