Export a object with comment ,but the comment is missing after build a *.d.ts file

I export an object,then I build to a declare file like `index.d.ts`,but the file has no comment about that object. ### Source code ```javascript //src/cache/index.ts import * as localStorage from "./localStorage" export default { /** * This is a comment2 */ localStorage } //src/index.ts import cache from "./cache/index" export default { /** * This is a comment1 */ cache } ``` ### Index.d.ts ```javascript declare const _default: { /** * This is a comment1 */ cache: { localStorage: typeof import("./cache/localStorage");//#### This field's comment is missing #### }; }; export default _default; ```