> ## Documentation Index
> Fetch the complete documentation index at: https://docs.appsignal.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bundling with esbuild

If you're bundling your Node.js app with [esbuild](https://esbuild.github.io/), it's necessary to mark the packages to instrument as external.

For example, if you are running an application with Mongoose and you want to send instrumentation data to AppSignal, you must flag the Mongoose dependency as `external` in your build script command as in the example below:

<CodeGroup>
  ```json JSON theme={null}
  {
    //...
    "build:appsignal": "esbuild src/appsignal.ts --bundle --platform=node --external:mongoose --external:@appsignal/nodejs"
    //...
  }
  ```
</CodeGroup>