non-ts package referencing ts package causes error (dev mode) #484

1. I have a monorepo structure like this

create-react-app
└── src
    ├── ...
    └── index.jsx
packages
└── shared
    └── src
        ├── index.ts
        └── helpers.ts

2. shared is a dependency of create-react-app

shared/src/index.ts

export * from "./helpers"

create-react-app/src/index.jsx

import {xxxx} from "shared"

3. Error cause (Simplified)

Module not found: Error: Can't resolve './helpers' in 'shared/src'

4. Situations (✅no cause, ❌cause error)

• ✅ Both packages are ts based
• ✅ Both packages are js based
• ❌ One js package referecing ts package, which ts package have internal relative imports.

5. My guess
   preconstruct dev mode creates symlink for module so that if dependent cannot resolve ts file then error causes.