How to Prevent Unwanted Export Combination?

[aeroxy]

I have set up my project as shown in this Git repository: https://github.com/aeroxy/dts-problem-demo

My goal is to output a lib folder with CommonJS (CJS) modules using TypeScript (tsc) and a special server folder where the index.js is bundled by Rollup (UMD) from /src/server.ts.

The problem arises when I try to generate TypeScript declaration files (*.d.ts) for my /src/server.ts file. By default, TypeScript produces a server.d.ts declaration file, but I want it to match the name of the output file, which is index.js. To address this, I've employed the rollup-plugin-dts to bundle the index.d.ts from /src/server.ts.

However, I've encountered an issue. When I write my source code as follows:

export { Demo };
export type { IFoo };

The plugin rollup-plugin-dts compiles it to:

export { type IFoo, ServerDemo };

This is undesirable because export { type IFoo, ServerDemo } is not supported in some older versions of TypeScript projects. How can I turn off this automatic combination and make it compile to the expected:

export { Demo };
export type { IFoo };

Please note that in lib/server.d.ts, where TypeScript compiles based on my tsconfig, it doesn't exhibit the unexpected merging of exports.