From bccae1632f4fd5b524e2eced370423a5a49b2dc0 Mon Sep 17 00:00:00 2001
From: limichange <limichange@hotmail.com>
Date: Wed, 10 Jun 2020 05:36:45 +0800
Subject: [PATCH] workflow: alert user working on repo if not using yarn
 (#1237)

---
 package.json         | 3 ++-
 scripts/checkYarn.js | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 scripts/checkYarn.js

diff --git a/package.json b/package.json
index a38b05a6b23..331d5fdf2c5 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,8 @@
     "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s",
     "dev-compiler": "npm-run-all --parallel \"dev template-explorer\" serve",
     "serve": "serve",
-    "open": "open http://localhost:5000/packages/template-explorer/local.html"
+    "open": "open http://localhost:5000/packages/template-explorer/local.html",
+    "preinstall": "node ./scripts/checkYarn.js"
   },
   "types": "test-dts/index.d.ts",
   "tsd": {
diff --git a/scripts/checkYarn.js b/scripts/checkYarn.js
new file mode 100644
index 00000000000..19d9f5157fb
--- /dev/null
+++ b/scripts/checkYarn.js
@@ -0,0 +1,5 @@
+if (!/yarn\.js$/.test(process.env.npm_execpath || '')) {
+  console.warn(
+    "\u001b[33mYou don't seem to be using yarn. This could produce unexpected results.\u001b[39m"
+  )
+}