diff --git a/.github/funding.yml b/.github/funding.yml
deleted file mode 100644
index 6a93851..0000000
--- a/.github/funding.yml
+++ /dev/null
@@ -1,4 +0,0 @@
-github: sindresorhus
-open_collective: sindresorhus
-tidelift: npm/grunt-eslint
-custom: https://sindresorhus.com/donate
diff --git a/package.json b/package.json
index 6aa4986..68fcb05 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
 		"email": "sindresorhus@gmail.com",
 		"url": "https://sindresorhus.com"
 	},
+	"sideEffects": false,
 	"engines": {
 		"node": "^18.18.0 || ^20.9.0 || >=21.1.0"
 	},