docCommentTemplate not returned for function in export assignment

[mjbvz]

From microsoft/vscode#72054

TypeScript Version: 3.5.0-dev.20190410

Search Terms:

• docCommentTemplate
• jsdoc

Code
For the javascript or typescript:

/** */
exports.foo = (a) => {}

Trigger a docCommentTemplate request for the function

Expected behavior:
Template returned

Actual behavior:
No result returned:

}
[Trace  - 11:14:12 AM] Sending request: docCommentTemplate (34). Response expected: yes. Current queue length: 0
Arguments: {
    "file": "/Users/matb/projects/san/x.js",
    "line": 1,
    "offset": 4
}
[Trace  - 11:14:12 AM] Response received: docCommentTemplate (34). Request took 3 ms. Success: false . Message: No content available.

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