From 1ee679395d96a48c100e31a50eb0719ebff3e42c Mon Sep 17 00:00:00 2001
From: Lucien Greathouse <me@lpghatguy.com>
Date: Thu, 3 Oct 2019 17:12:08 -0700
Subject: [PATCH] Add 'invariant' function for debugging

---
 plugin/src/invariant.lua | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 plugin/src/invariant.lua

diff --git a/plugin/src/invariant.lua b/plugin/src/invariant.lua
new file mode 100644
index 00000000..3923095b
--- /dev/null
+++ b/plugin/src/invariant.lua
@@ -0,0 +1,27 @@
+local Config = require(script.Parent.Config)
+
+local invariant
+
+if Config.isDevBuild then
+	function invariant(message, ...)
+		message = string.format(message, ...)
+
+		error("Invariant violation: " .. message, 2)
+	end
+else
+	function invariant(message, ...)
+		message = string.format(message, ...)
+
+		local fullMessage = string.format(
+			"Rojo detected an invariant violation within itself:\n" ..
+			"%s\n\n" ..
+			"This is a bug in Rojo. Please file an issue:\n" ..
+			"https://github.com/rojo-rbx/rojo/issues",
+			message
+		)
+
+		error(fullMessage, 2)
+	end
+end
+
+return invariant
\ No newline at end of file