Minimal reproduction -
File structure
tsup.config.ts
import { defineConfig } from 'tsup'
export default defineConfig({
entry: ['lib', 'types'],
dts: true,
})types/helpers.ts (only contains types)
export type Optional<T> = T | null | undefinedlib/index.ts
import { Optional } from '../types/helpers'
export function log(message?: Optional<string>) {
console.log(message ?? '<no-message>')
}This will output helpers.js with empty exports or full empty file if using esm format
egoist / tsup
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