add only-allow pnpm hook

Author: velzie

package.json

@@ -13,7 +13,8 @@
 		"build:chrome": "cd packages/chrome && pnpm build",
 		"dev": "node --no-warnings=ExperimentalWarning devserver.ts",
 		"watch": "rspack build --watch",
-		"format": "prettier --write ."
+		"format": "prettier --write .",
+		"preinstall": "npx only-allow pnpm"
 	},
 	"devDependencies": {
 		"@mercuryworkshop/wisp-js": "^0.4.0",

packages/scramjet/package.json

@@ -7,7 +7,9 @@
 	"author": "Mercury Workshop",
 	"license": "AGPL-3.0-only",
 	"packageManager": "[email protected]",
-	"scripts": {},
+	"scripts": {
+		"preinstall": "npx only-allow pnpm"
+	},
 	"devDependencies": {
 		"@rsdoctor/rspack-plugin": "^1.3.6",
 		"@rslib/core": "^0.16.1",