Created Observe method for Replica class under ReplicaController

aftman.toml

@@ -0,0 +1,8 @@
+# This file lists tools managed by Aftman, a cross-platform toolchain manager.
+# For more information, see https://github.com/LPGhatguy/aftman
+
+# To add a new tool, add an entry to this table.
+[tools]
+rojo = "rojo-rbx/rojo@7.4.1"
+wally = "UpliftGames/wally@0.3.2"
+selene = "Kampfkarren/selene@0.27.1"

default.project.json

@@ -1,22 +1,6 @@
 {
 	"name": "ReplicaService",
-	"servePlaceIds": null,
 	"tree": {
-		"$className": "DataModel",
-		"ReplicatedStorage": {
-			"$className": "ReplicatedStorage",
-			"$ignoreUnknownInstances": true,
-			"$path": "src/ReplicatedStorage"
-		},
-		"ServerScriptService": {
-			"$className": "ServerScriptService",
-			"$ignoreUnknownInstances": true,
-			"$path": "src/ServerScriptService"
-		},
-		"ServerStorage": {
-			"$className": "ServerStorage",
-			"$ignoreUnknownInstances": true,
-			"$path": "src/ServerStorage"
-		}
+		"$path": "src"
  	}
 }

selene.toml

@@ -0,0 +1 @@
+std = "roblox"

src/ReplicatedStorage/ReplicaController.lua → src/ReplicaController.lua

@@ -683,6 +683,21 @@ Replica = {}
 Replica.__index = Replica
 
 -- Listening:
+function Replica:Observe(path, listener) --> [ScriptConnection] listener(new_value)
+	if type(listener) ~= "function" then
+		error("[ReplicaController]: Only a function can be set as listener in Replica:Observe()")
+	end
+
+	local path_array = (type(path) == "string") and StringPathToArray(path) or path
+	if #path_array < 1 then
+		error("[ReplicaController]: Passed empty path - a value key must be specified")
+	end
+
+	listener(self.Data[path])
+
+	return self:ListenToChange(path, listener)
+end
+
 function Replica:ListenToChange(path, listener) --> [ScriptConnection] listener(new_value)
 	if type(listener) ~= "function" then
 		error("[ReplicaController]: Only a function can be set as listener in Replica:ListenToChange()")
@@ -1086,4 +1101,4 @@ rev_ReplicaDestroy.OnClientEvent:Connect(function(replica_id) -- (replica_id)
 	DestroyReplicaAndDescendantsRecursive(replica)
 end)
 
-return ReplicaController
+return ReplicaController