docs: add new page to faq

Author: dangreen

website/docs/faq/docs.js

@@ -28,4 +28,8 @@ exports.docs = [
     title: 'How to use react-chartjs-2 with TypeScript?',
     slug: '/faq/typescript',
   },
+  {
+    title: 'How to fix "Cannot find module \'react-chartjs-2\'" error?',
+    slug: '/faq/esm-only',
+  },
 ];

website/docs/faq/esm-only.md

@@ -0,0 +1,16 @@
+---
+slug: /faq/esm-only
+---
+
+# How to fix "Cannot find module 'react-chartjs-2'" error?
+
+Chart.js v4 and react-chartjs-2 v5 are [ESM-only packages](https://nodejs.org/api/esm.html). To use them in your project, it also should be ESM:
+
+```json title="package.json"
+{
+  "type": "module"
+}
+```
+
+If you are experiencing this problem with Jest, you should follow [this doc](https://jestjs.io/docs/ecmascript-modules) to enable ESM support. Or, we can recommend you migrate to [Vitest](https://vitest.dev/). Vitest has ESM support out of the box and [has almost the same API as Jest](https://vitest.dev/guide/migration.html#migrating-from-jest). [Here is our example of migration](https://github.com/reactchartjs/react-chartjs-2/commit/7f3ec96101d21e43cae8cbfe5e09a46a17cff1ef).
+