Mark formik as side-effect free (#3501)

This will allow Formik's code to be removed by tree-shaking bundlers like Webpack or esbuild.
jaredpalmer · Sep 11, 2023 · fe4ed7e · fe4ed7e · vercel · Sep 11, 2023
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diff --git a/.changeset/wise-games-battle.md b/.changeset/wise-games-battle.md
@@ -0,0 +1,5 @@
+---
+"formik": patch
+---
+
+Mark `formik` as side-effect free in `package.json`
diff --git a/packages/formik/package.json b/packages/formik/package.json
@@ -37,6 +37,7 @@
   "peerDependencies": {
     "react": ">=16.8.0"
   },
+  "sideEffects": false,
   "scripts": {
     "test": "tsdx test --env=jsdom",
     "test:watch": "npm run test -- --watchAll",