Add a package sideEffects field.

jaydenseric · jaydenseric · commit 4de0644a10a5 · 2021-05-21T22:01:38.000+10:00
diff --git a/package.json b/package.json
@@ -2,6 +2,7 @@
   "name": "prop-types",
   "version": "15.7.2",
   "description": "Runtime type checking for React props and similar objects.",
+  "sideEffects": false,
   "main": "index.js",
   "license": "MIT",
   "files": [
