The syntax of the output declaration file is incorrect

[eavidy]

• Version: 3.4.5
• Rollup Version: 4.17.2
• Operating System and version (if applicable): Mac OS
• Node Version (if applicable): 20.14.0
• Does it work with tsc (if applicable): yes

Reproduction

Repo: https://github.com/eavidy/test_case/tree/rollup-plugin-ts git clone -b rollup-plugin-ts [email protected]:eavidy/test_case.git

package.json

{
  "name": "tess",
  "version": "1.0.0",
  "type": "module",
  "devDependencies": {
    "rollup": "^4.17.2",
    "rollup-plugin-ts": "^3.4.5",
    "tslib": "^2.6.2",
    "typescript": "^5.4.5"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "node",
    "lib": ["ESNext"],
    "strict": true,
    "declaration": true
  },
  "exclude": ["node_modules", "dist"]
}

rollup.config.js

//@ts-check
import { defineConfig } from "rollup";
import tsPlugin from "rollup-plugin-ts";

export default defineConfig({
  input: ["./src/mod.ts"],
  output: {
    dir: "dist",
  },
  plugins: [tsPlugin({})],
});

src/mod.ts

export * from "./sub.js";

src/sub.ts

export function array() {}
array.function = 1;

run pnpm rollup -c

Expected Behavior

The output declaration file is correct

Actual Behavior

A declaration file with syntax errors was output (Contains incorrect characters: "generated@68")

declare function array(): void;
declare namespace array {
    var generated@68: number;
    export { generated@68 as function };
}
export { array };