If you want to be able to printout or save the outline the ctr / command + r is not very useful.
One can do a simple find all on the following grep ^[^\n]*function[^{]+{
or some variant of it to suit the language and situation you are working in.
Once you do the find all you can copy and paste the result to a new document and depending on the number of functions should not take long to tidy up.
The answer is far from perfect, particularly for cases when the comments have the word function (or it's equivalent) in them, but I do think it's a helpful answer.
With a very quick edit this is the result I got on what I'm working on now.
PathMaker.prototype.start = PathMaker.prototype.initiate = function(point){};
PathMaker.prototype.path = function(thePath){};
PathMaker.prototype.add = function(point){};
PathMaker.prototype.addPath = function(path){};
PathMaker.prototype.go = function(distance, angle){};
PathMaker.prototype.goE = function(distance, angle){};
PathMaker.prototype.turn = function(angle, distance){};
PathMaker.prototype.continue = function(distance, a){};
PathMaker.prototype.curve = function(angle, radiusX, radiusY){};
PathMaker.prototype.up = PathMaker.prototype.north = function(distance){};
PathMaker.prototype.down = PathMaker.prototype.south = function(distance){};
PathMaker.prototype.east = function(distance){};
PathMaker.prototype.west = function(distance){};
PathMaker.prototype.getAngle = function(point){};
PathMaker.prototype.toBezierPoints = function(PathMakerPoints, toSource){};
PathMaker.prototype.extremities = function(points){};
PathMaker.prototype.bounds = function(path){};
PathMaker.prototype.tangent = function(t, points){};
PathMaker.prototype.roundErrors = function(n, acurracy){};
PathMaker.prototype.bezierTangent = function(path, t){};
PathMaker.prototype.splitBezier = function(points, t){};
PathMaker.prototype.arc = function(start, end){};
PathMaker.prototype.getKappa = function(angle, start){};
PathMaker.prototype.circle = function(radius, start, end, x, y, reverse){};
PathMaker.prototype.ellipse = function(radiusX, radiusY, start, end, x, y , reverse/*, anchorPoint, reverse*/ ){};
PathMaker.prototype.rotateArc = function(path /*array*/ , angle){};
PathMaker.prototype.rotatePoint = function(point, origin, r){};
PathMaker.prototype.roundErrors = function(n, acurracy){};
PathMaker.prototype.rotate = function(path /*object or array*/ , R){};
PathMaker.prototype.moveTo = function(path /*object or array*/ , x, y){};
PathMaker.prototype.scale = function(path, x, y /* number X scale i.e. 1.2 for 120% */ ){};
PathMaker.prototype.reverse = function(path){};
PathMaker.prototype.pathItemPath = function(pathItem, toSource){};
PathMaker.prototype.merge = function(path){};
PathMaker.prototype.draw = function(item, properties){};