Guidance on using with Typescript and Yarn workspaces

Hey there, Jetpack looks great and I am hoping to be able to use it after struggling with serverless-webpack for the last few days.

I have a typescript monorepo using yarn workspaces, and found [this issue](https://github.com/FormidableLabs/serverless-jetpack/issues/74) in which you say to build manually with a script. However, it's not clear how to configure this with Jetpack. Right now I have

```
package:
include:
- "**/dist/**"
- "!**/node_modules/aws-sdk/**"
- "!**/node_modules/@prisma/**"
- "!**/node_modules/.prisma/**"
- "!**/node_modules/typescript/**"
- "!**/node_modules/.cache/**"

custom:
jetpack:
# Search for hoisted dependencies to one parent above normal.
base: "../.."
```

This is including my entire hoisted `node_modules` folder (including aws-sdk, typescript, other dev dependencies, etc) and so is too large for lambda. Further, it's not clear how to connect it to the function.

Would it be:
```
functions:
stripe:
timeout: 30
handler: dist/stripe-webhook.paymentIntentWebhook
events:
- http:
path: '/webhooks/payment_intent'
method: POST
cors: true
```
???

Any guidance is much appreciated. Thanks