TypeScript Syntax highlighting is wrong when comments are inside type definition

Type: Bug

Syntax highlighting in TypeScript is wrong in cases where there are comments in the type.

type MyType =
  | null //
  | undefined;

let test:
  | null //
  | undefined;

let test2:
  | "a" //
  | null;

let a: null | "a"; //

let b: //
  null | "a";

let c: "a" | null;

let d:
  | "a" //
  | null;

let e:
  | "a" //
  | null
  | undefined;

let f:
  | "a"
  | null //
  | undefined;

let g:
  | "a"
  | null
  //
  | undefined;

type A = {
  a: null | undefined;
  b:
  | null //
  | undefined;
  c: //
  null | undefined;
  d:
  | "a" //
  | undefined
  | null //
  | true;
};

Below is a screenshot of the same code in VSCode and in the TypeScript playground. The typescript playground textmate grammar seems to handle all these cases correctly, but the VSCode one doesn't. Please note that there are some differences in the theme (property names are blue, keywords in type definitions are green), but the VSCode grammar is inconsistent with itself.

Keywords: Textmate Grammar

VS Code version: Code - Insiders 1.82.0-insider (d62534a60f7eb4280bcbee66bbd84a2e15f13765, 2023-08-10T05:33:20.243Z)
OS version: Windows_NT x64 10.0.22000
Modes:
Remote OS version: Linux x64 5.15.90.1-microsoft-standard-WSL2
Remote OS version: Linux x64 5.15.90.1-microsoft-standard-WSL2

vsliv695:30137379
vsins829:30139715
vsliv368:30146709
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
vstes627:30244334
vslsvsres303:30308271
pythontb:30258533
vsc_aacf:30263846
pythonptprofiler:30281269
vshan820:30294714
vscod805:30301674
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
pythonvs932:30404738
py29gd2263:30784851
vsclangdf:30492506
c4g48928:30535728
dsvsc012:30540252
pynewext54:30618038
2i9eh265:30646982
showlangstatbar:30737417
24365598:30687740
pythonfmttext:30716741
fixshowwlkth:30771523
showindicator:30805243
pythongtdpath:30726887
i26e3531:30792625
gsofa:30797620
welcomedialog:30812478
pythonnosmt12:30779711
pythonidxpt:30768918
pythonnoceb:30776497
copilotsettingt:30808721
dsvsc013:30777762
dsvsc014:30777825
diffeditorv2:30786206
pythonmhint1:30815193

まず、このリポジトリ内の TypeScript TextMate 文法ルールを見つけ、報告にある TypeScript の例で問題を再現します。型定義内のコメントのハイライトを VS Code および TypeScript playground と比較します。既存の文法の動作を壊すことなく、影響を受けるケースが一貫してハイライトされれば完了です。