Fix last analysis error

.lune/install.luau

@@ -3,12 +3,20 @@ local fs = require("@lune/fs")
 local constants = require("./lib/constants")
 local run = require("./lib/run")
 
-local function toPascalCase(text: string)
-	return text:gsub("(.+)(%.%w+)$", function(name, ext)
-		return name:gsub("(%a)(%w+)", function(first, rest)
-			return `{first:upper()}{if rest then rest else ""}`
-		end):gsub("%-", "") .. ext
-	end)
+local function toPascalCase(filename: string)
+	local name, ext = filename:match("(.+)(%.%w+)$")
+
+	local function upperFirstLetter(first: string, rest: string)
+		return `{first:upper()}{if rest then rest else ""}`
+	end
+
+	if name and ext then
+		name = filename:gsub("(%a)(%w+)", upperFirstLetter :: any):gsub("%-", "")
+
+		return name .. ext
+	else
+		return filename
+	end
 end
 
 local function convertPackageNames()