navtree does not include entry for export default of an expression

[mjbvz]

From microsoft/vscode#79686

TypeScript Version: 3.7.0-dev.20191016

Search Terms:

• navtree
• outline
• tsserver

Code
For the code:

const abc = 12;

export default abc;

1. Make a navtree request against TS Server

Expected behavior:
An entry for the export default abc is included. VS Code needs this information in order to show the references code lens on the default export

Actual behavior:
No entry for the export itself is returned

[Trace  - 4:23:03 PM] <syntax> Response received: navtree (225). Request took 1 ms. Success: true 
Result: {
    "text": "\"foo\"",
    "kind": "module",
    "kindModifiers": "",
    "spans": [
        {
            "start": {
                "line": 1,
                "offset": 1
            },
            "end": {
                "line": 4,
                "offset": 4
            }
        }
    ],
    "childItems": [
        {
            "text": "abc",
            "kind": "const",
            "kindModifiers": "",
            "spans": [
                {
                    "start": {
                        "line": 1,
                        "offset": 7
                    },
                    "end": {
                        "line": 1,
                        "offset": 15
                    }
                }
            ],
            "nameSpan": {
                "start": {
                    "line": 1,
                    "offset": 7
                },
                "end": {
                    "line": 1,
                    "offset": 10
                }
            }
        }
    ]
}