Dotted type in jsdoc is not parsed correctly

[flaviut]

TypeScript Version: 2.4.0-dev.20170605
Code

import React from 'react';

/**
 * @param {React.FormEventHandler<Checkbox>} a
 */
function foo(a) {}

Expected behavior:
The language service parses the jsdoc as documented in https://github.com/Microsoft/TypeScript/wiki/JSDoc-support-in-JavaScript

Actual behavior:
[js] '}' expected. at the <. This appears to be a problem with the dotted type, i.e. import React, {FormEventHandler} from react; …{FormEventHandler<Checkbox>} … works fine.

Reproduced using visual studio code (I don't know how to manually launch and use the language service).

[DanielRosenwasser]

Does it work if you write import * as React from "react"?

[flaviut]

Nope:

import * as React from 'react';

/**
 * @param {React.FormEventHandler<Checkbox>} a
 */
function foo(a) {}

'}' expected.

---

This error also happens, as expected, so I think that confirms that the type can be correctly resolved:

import React from 'react';

/**
 * @param {React.FormEventHandler} a
 */
function foo(a) {}

Generic type 'FormEventHandler' requires 1 type argument(s).

[Volox]

Is this also somehow related to #14233 ? Is there a semantic difference from namespace and dotted notation in Typescript?

[sandersn]

JSDoc syntax requires a dot before the type arguments: React.FormEventHandler.<CheckBox>. Closure Compiler syntax does not, though.

#17176 should have fixed this because now JSDoc and Typescript use the same parser for all types, so this should be parsed as a normal Typescript-syntax type reference.