Can't add local package in a monorepo lerna project

Here’s the solution if anyone stumble upon this scenario (monorepo with local TS packages):

You need to build them all first before building your website.

netlify.toml example:

[build]
  command = "npx lerna build" # build not only frontend, but all TS packages with a build script.
  functions = ""
  publish = "packages/frontend/public"

Besides that, leave it all in a default lerna + yarn workspaces configuration. It handles all the local and external packages gracefully.

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