Backticks used in JSDoc in a particular way cause tsserver to crash

[westonpace]

TypeScript Version: 3.5.1

Search Terms: JSDoc backticks tsserver crash no intellisense

Code

/**
* @param `arg` str: string argument that will be shown in message
*/
function hello(arg: string) {
    console.log(arg);
}

hello('World');

Expected behavior:
This compiles fine with tsc. When loaded into VSCode however tsserver crashes without any meaningful error message.

Actual behavior:
tsserver should not crash. An error would be fine if this is invalid JSDoc (I don't actually know JSDoc).

Playground Link:
Since this only happens in tsserver I have no playground link

Related Issues:
I believe this may be related to this change: c3a9429

The issue is not present in 3.4

The function parseBracketNameInPropertyAndParamTag calls parseExpectedTokenJSDoc(SyntaxKind.BacktickToken); and parseExpectedTokenJSDoc then calls ts.tokenToString(t) on SyntaxKind.BacktickToken and this returns undefined. This undefined then blows up in an assert later on.

[rbuckton]

It looks like this was fixed by #32429.