Adding npm link docs

Author: dylburger

packages/sdk/README.md

@@ -19,3 +19,63 @@ The [quickstart](https://pipedream.com/docs/connect/quickstart) is the easiest w
 ## Example app
 
 Clone and run the [example app](https://github.com/PipedreamHQ/pipedream-connect-examples/) to get started.
+
+## Developing on the SDK
+
+Clone this repo and initialize global dependencies. We use `asdf` to manage these dependencies — [install it here](https://asdf-vm.com/). Then run
+
+```bash
+asdf install
+```
+
+Install deps locally:
+
+```bash
+npm i
+```
+
+To build the package:
+
+```bash
+npm run build
+```
+
+You can use `npm link` to point other code to the local version of the SDK you're developing on. This lets you test the SDK in other local apps, end-to-end.
+
+First run `npm link` in the `sdk` directory:
+
+```bash
+# From repo root
+cd packages/sdk
+npm link
+```
+
+Since we're using a fixed version of Node.js (provided by `asdf` above), this will install the package to the `asdf` Node environment. To use this package elsewhere, you'll need to use the same version of Node.js. Please reference the latest version of [the `.tool-versions` file](https://github.com/PipedreamHQ/pipedream/blob/master/.tool-versions) and add that either to the `.tool-versions` file in your local project where you'd like to use the SDK.
+
+For example:
+
+```bash
+cd your_project_directory
+echo `nodejs 22.10.0` >> `.tool-versions` # Please reference the latest version being used in the Pipedream public repo
+```
+
+Then, in your local project, run
+
+```bash
+npm link @pipedream/sdk
+```
+
+To confirm you successfully installed the correct version of the SDK, tied to your local copy of the Pipedream SDK:
+
+```bash
+cd node_modules/@pipedream
+ls -l
+```
+
+and you should see the `sdk` package pointing to your local directory:
+
+```bash
+❯ ls -l
+total 0
+lrwxr-xr-x  1 dylburger  staff  34 Oct 29 20:09 sdk -> ../../../../pipedream/packages/sdk
+```