A guide on resolving TypeScript monorepo webpack loader problems

I recently created a typescript monorepo here with the following organized folder structure:

.
└── packages
    ├── package.json // Contains the monorepo workspace configuration
    ├── web-app // Includes the NextJS website files
    └── web-core // Holds the redux business logic components

Whenever I initiate yarn dev either in the root directory or within the web-app directory, I encounter this parsing error message:

error - ../web-core/index.ts
Module parse failed: Unexpected token (3:7)
You may need an appropriate loader to handle this file type, as currently no loaders are configured to process this file. Check out https://webpack.js.org/concepts#loaders
| export * from "./counter";
| export { default as MyProvider } from "./provider";
> export type { RootState } from "./store";
|

I understand that this is likely a webpack or babel issue within the web-core directory, but I would greatly appreciate some guidance on how to resolve this issue. Any help would be greatly appreciated. Thank you!

Answer №1

Have you considered removing the type keyword from the statement

export type { RootState } from "./store";
?

Answer №2

After much exploration, I have cracked the code. My strategy involves using a monorepo setup with NextJS in the 'web-app' directory and Redux in 'web-core'. In order to integrate 'web-core' into 'web-app', it is crucial to first compile 'web-core' before adding it to the 'web-app' package.json. Since my intention is not to release 'web-core' as a standalone npm package, building it is sufficient.

To accomplish this, I brought in 'next-transpile-modules' as a development dependency in 'web-app' and implemented the following code in 'next.config.js':

...

const withTM = require("next-transpile-modules")(["@issue/web-core"]);

module.exports = withTM(nextConfig);

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