TypeScript Syntax highlighting is wrong when comment... | microsoft/TypeScript-TmLanguage

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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

System Info

Item	Value
CPUs	AMD Ryzen 9 5900X 12-Core Processor (24 x 4200)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	31.92GB (5.45GB free)
Process Argv	--crash-reporter-id 68f6fdac-c31a-432d-8c54-337698814abd
Screen Reader	no
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 5.15.90.1-microsoft-standard-WSL2
CPUs	AMD Ryzen 9 5900X 12-Core Processor (24 x 4200)
Memory (System)	15.58GB (5.49GB free)
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 5.15.90.1-microsoft-standard-WSL2
CPUs	AMD Ryzen 9 5900X 12-Core Processor (24 x 4200)
Memory (System)	15.58GB (5.49GB free)
VM	0%

Extensions: none

A/B Experiments

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Comienza localizando las reglas de gramática de TextMate para TypeScript en este repositorio y reproduce el problema con los ejemplos de TypeScript del informe. Compara el resaltado de los comentarios dentro de las definiciones de tipos con VS Code y el TypeScript playground. Se considera terminado cuando los casos afectados se resalten de forma coherente sin romper el comportamiento existente de la gramática.

Escrito por el modelo de indexación a partir del texto del issue.

TypeScript Syntax highlighting is wrong when comments are inside type definition

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