feat(sync): add flatten() function (#43)

packages/charm-sync/src/flatten.luau

@@ -0,0 +1,28 @@
+local types = require(script.Parent.types)
+type AtomMap = types.AtomMap
+
+type NestedAtomMap = {
+	[string]: NestedAtomMap | () -> (),
+}
+
+local function flatten(atoms: NestedAtomMap): AtomMap
+	local result: AtomMap = {}
+
+	local function visit(node: NestedAtomMap, path: string)
+		for key, value in node do
+			local location = if path == "" then key else path .. "/" .. key
+
+			if type(value) == "table" then
+				visit(value, location)
+			else
+				result[location] = value
+			end
+		end
+	end
+
+	visit(atoms, "")
+
+	return result
+end
+
+return flatten