From 5bd2aaae9bfc35c675dc7a2e29db5334dabad66f Mon Sep 17 00:00:00 2001
From: James Stuckey Weber <james@oddbird.net>
Date: Tue, 29 Oct 2024 13:52:30 -0400
Subject: [PATCH] Throw if multiple features use the same caniuse id

---
 scripts/caniuse.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/caniuse.ts b/scripts/caniuse.ts
index ef4906fde3c..276efa50110 100644
--- a/scripts/caniuse.ts
+++ b/scripts/caniuse.ts
@@ -36,6 +36,9 @@ for (const [id, data] of Object.entries(features)) {
         if (!mapping.has(caniuseId)) {
             throw new Error(`Invalid caniuse ID used for ${id}: ${caniuseId}`);
         }
+        if(mapping.get(caniuseId)){
+            throw new Error(`Duplicate caniuse ID "${caniuseId}" used for "${id}" and "${mapping.get(caniuseId)}"`);
+        }
         if (hiddenCaniuseItems.has(caniuseId)) {
             throw new Error(`A caniuse ID used for "${id}" ("${caniuseId}") is hidden on caniuse.com`);
         }