[!] Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)

[East-Apollo]

• Rollup Plugin Name: @rollup/plugin-typescript
• Rollup Plugin Version: 8.5.0
• Rollup Version: 2.79.1
• Operating System (or Browser): macOsx
• Node Version: 14.16.0
• Link to reproduction (⚠️ read below):

Expected Behavior

There are two sub projects in my project
/packages/A/src/**
/packages/shared/src/**

I referenced the shared project packages.json configuration in Project A as follows:
"devDependencies": {
"B": "workspace:*",
}

Project A refers to a method from Project shared, and I hope to build it normally

/projects/A/src/A.ts
/projects/A/rollup.config.js

/projects/shared/src/somemod.ts

// A.ts
import {theAnswer} from "shared/src/somemod";
console.log(theAnswer);

When I run the build in /projects/A/, the build failes with the described error.
[!] Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)

Actual Behavior

During the actual process of building and packaging, I was constantly prompted:
[!] Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)

I have already configured the relevant plugins and it is normal to directly include this method in project A. However, I envision a directory for storing public methods.

How can I solve this problem

Additional Information