feat(docs): Under prerequisites, considerations for nodejs

docs/src/SUMMARY.md

@@ -4,6 +4,7 @@
 - [Quickstart](./quickstart.md)
 - [Prerequisites](./prerequisites/index.md)
   - [npm (optional)](./prerequisites/npm.md)
+  - [considerations](./prerequisites/considerations.md)
   - [Non-`rustup` setups](./prerequisites/non-rustup-setups.md)
 - [Commands](./commands/index.md)
   - [`new`](./commands/new.md)

docs/src/prerequisites/considerations.md

@@ -0,0 +1,38 @@
+# nodejs
+
+Currently, `wasm-pack` generated npm modules require us to you have [fetch] polyfill in your node project.
+
+If there is a module from `wasm-pack build --target nodejs` you may encounter some errors regarding global `Headers`, `Request`, `Response` and `fetch` Web APIs.
+
+## Common errors:
+
+```js
+ReqwestError(reqwest::Error { kind: Builder, source: "JsValue(ReferenceError: Headers is not defined
+ReqwestError(reqwest::Error { kind: Builder, source: "JsValue(ReferenceError: Request is not defined
+
+    var ret = getObject(arg0) instanceof Response;
+ReferenceError: Response is not defined
+```
+
+## Workarround
+Import or declare fetch and objects: Headers, Request, Response
+
+```ts
+// CommonJS
+const fetch = require('node-fetch');
+
+// ES Module
+import fetch from 'node-fetch';
+
+// @ts-ignore
+global.fetch = fetch;
+// @ts-ignore
+global.Headers = fetch.Headers;
+// @ts-ignore
+global.Request = fetch.Request;
+// @ts-ignore
+global.Response = fetch.Response;
+```
+
+[fetch]: https://github.com/node-fetch/node-fetch
+