JSDoc optional property in object

**TypeScript Version:** 3.9.x & 4.1.x <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** jsdoc optional There seems to be a regression since version 3.9.x where optional params in JSDocs are not converted correctly in declaration files. Several issues were created (linked below) and patches were made, however, it seems that **params nested inside objects** are still not correctly handled as optional when surrounded by brackets. **Code** ```ts /** * Does Foo * * @param {object} opts * @param {string} [opts.bar] - is optional * @returns void */ function foo(opts ) { // .. } ``` **Expected behavior: (as well as actual behavior <=3.8.3)** ```js declare function foo(opts: { bar?: string; }): void; ``` **Actual behavior:** ```js declare function foo(opts: { bar: string; }): void; ``` **Related Issues:** <!-- Did you find other bugs that looked similar? --> https://github.com/microsoft/TypeScript/issues/39111 was addressed with https://github.com/microsoft/TypeScript/pull/39487, but it doesn't seem that nested properties were covered in that fix. https://github.com/microsoft/TypeScript/pull/39123 and https://github.com/microsoft/TypeScript/pull/39457 seem to relate to Closure notation, not sure if they're related.