Add symbol for element status (#49)

* add symbol for element status (Core.Element)
* remove isElement from createElement table
* rename element.type to element.component

lib/Core.lua

@@ -23,6 +23,9 @@ Core.Portal = Symbol.named("Portal")
 -- Marker used to specify that the value is nothing, because nil cannot be stored in tables.
 Core.None = Symbol.named("None")
 
+-- Marker used to specify that the table it is present within is a component.
+Core.Element = Symbol.named("Element")
+
 --[[
 	Utility to retrieve one child out the children passed to a component.
 
@@ -71,8 +74,8 @@ function Core.createElement(elementType, props, children)
 	end
 
 	local element = {
-		isElement = true,
-		type = elementType,
+		component = elementType,
+		type = Core.Element,
 		props = props,
 	}
 

lib/Reconciler.lua

@@ -37,7 +37,7 @@ local function isPortal(element)
 		return false
 	end
 
-	return element.type == Core.Portal
+	return element.component == Core.Portal
 end
 
 local Reconciler = {}
@@ -52,7 +52,7 @@ local function isPrimitiveElement(element)
 		return false
 	end
 
-	return type(element.type) == "string"
+	return type(element.component) == "string"
 end
 
 --[[
@@ -63,7 +63,7 @@ local function isFunctionalElement(element)
 		return false
 	end
 
-	return type(element.type) == "function"
+	return type(element.component) == "function"
 end
 
 --[[
@@ -74,7 +74,7 @@ local function isStatefulElement(element)
 		return false
 	end
 
-	return type(element.type) == "table"
+	return type(element.component) == "table"
 end
 
 --[[
@@ -156,7 +156,7 @@ function Reconciler._reifyInternal(element, parent, key, context)
 	if isPrimitiveElement(element) then
 		-- Primitive elements are backed directly by Roblox Instances.
 
-		local rbx = Instance.new(element.type)
+		local rbx = Instance.new(element.component)
 
 		-- Update Roblox properties
 		for key, value in pairs(element.props) do
@@ -208,7 +208,7 @@ function Reconciler._reifyInternal(element, parent, key, context)
 			_context = context,
 		}
 
-		local vdom = element.type(element.props)
+		local vdom = element.component(element.props)
 		if vdom then
 			instanceHandle._reified = Reconciler._reifyInternal(vdom, parent, key, context)
 		end
@@ -227,7 +227,7 @@ function Reconciler._reifyInternal(element, parent, key, context)
 			_reified = nil,
 		}
 
-		local instance = element.type._new(element.props, context)
+		local instance = element.component._new(element.props, context)
 
 		instanceHandle._instance = instance
 		instance:_reify(instanceHandle)
@@ -307,7 +307,7 @@ function Reconciler._reconcileInternal(instanceHandle, newElement)
 
 	-- If the element changes type, we assume its subtree will be substantially
 	-- different. This lets us skip comparisons of a large swath of nodes.
-	if oldElement.type ~= newElement.type then
+	if oldElement.component ~= newElement.component then
 		local parent = instanceHandle._parent
 		local key = instanceHandle._key
 
@@ -352,7 +352,7 @@ function Reconciler._reconcileInternal(instanceHandle, newElement)
 	elseif isFunctionalElement(newElement) then
 		instanceHandle._element = newElement
 
-		local rendered = newElement.type(newElement.props)
+		local rendered = newElement.component(newElement.props)
 		local newChild
 
 		if instanceHandle._reified then