Help text in object-literal @property JSDoc missing from Intellisense when hovering over that property

[justingrant]

TypeScript Version: typescript@3.7.0-dev.20190928

Search Terms:
typescript jsdoc object property help text intellisense

Code

/**
 * @typedef {Object} Works - This type shows property help
 */
interface Works {
  /** This is property `a` */
  a: number;
}
// If you hover over `a`, the JSDoc help text is shown
// (as expected) for that property.
const y: Works = { a: 1 };

/**
 * @typedef {Object} Broken - Property help is missing
 * @property {number} a - This help text never shows up
 */
interface Broken {
  a: number;
}
// If you hover over `a`, the JSDoc help text is missing
const x: Broken = { a: 1 };

Expected behavior:

Actual behavior:

Playground Link:
https://codesandbox.io/s/autumn-architecture-m084y

https://www.typescriptlang.org/play/#code/PQKhFgCgAIWgBALgTwA4FMAm6Bm0DeA8gEYBW6AxogL7QDqA9gE4DWAztALTQAqAFgEsOKDNDZ8GAdw6omDDExTQ+6ADaoosYFAEA7ROiY4AhhXT1m7Apuig4-IdEez5hpQANj7rTeMAuaF0AVwBbYkMAbihqKGBgaABJPGQGIOUGADdDaEzsz3cAGmhEFWgAKQBlABEGCmU1VGL0AA9EJw5xKV1Y+IAKYw4WjCosAEpoHGZivmM2lwUUADooCgZdNjbkAMZWDgBeAmh-aABGaGooyFiwTTgkNCxcAhJyKloAITkWdF0uaAAFOQLZD1dTtaAhIRsPQAc1uCHmbhB+GCYUMtGMfwcHBUYIMrUC6CyTDEEmk0CCGhgIG0kD0BiMpnMnwY31++F8AVR4SYlxikDiiWSqXSxJyYvyRRK5kqNTquMa+LajkhbGhujhkFW6zazQCLLZ0AO+COATOFygUCAA

Related Issues:

• Object member type defined by JSDoc @property tags are not recoganized #9620 seems to claim that this problem was fixed by fix the issue that @property types are not recoganized #9621, but clearly it's not fully fixed.
• JSDoc documentation for interface members does not show in tooltips for properties on anonymous objects that are typed to those interfaces #18358 also seems to claim to have fixed this problem, but the "working" example shown uses the "per-property" help text (like Works in this task), not the help text in @property tags.

I also found other issues which seemed related to class properties or destructured properties, but I'm assuming that this object-literal-properties issue may be different. Here's a few: #20894, #4261, #26611

[sandersn]

@typedef only works in JS files. Even if it worked in TS files, because interface is self-contained in Typescript, Typescript has no reason to look at jsdoc for additional info.

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.