Broken syntax highlighting for generic function with optional type in Typescript JSX

Type: Bug

Inside of a new .tsx file, create the following code:

type GenericType<T> = boolean;

const testGeneric = <T = void,>(): GenericType<T> => {
  return true;
};

const testGeneric2 = <T,>(): GenericType<T> => {
  return true;
};

Every => after the <T = void,> will be incorrectly highlighted.

Screenshot 2023-02-24 at 11 37 44 AM

VS Code version: Code 1.75.1 (Universal) (441438abd1ac652551dbe4d408dfcec8a499b8bf, 2023-02-08T21:34:59.000Z) OS version: Darwin arm64 22.2.0 Modes: Sandboxed: No

System Info

|Item|Value| |---|---| |CPUs|Apple M1 Pro (8 x 24)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: disabled_off
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
metal: disabled_off
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_renderer: enabled_on
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: disabled_off| |Load (avg)|2, 2, 2| |Memory (System)|16.00GB (0.09GB free)| |Process Argv|--crash-reporter-id b866acdc-8967-448e-b6c1-00876386ce17| |Screen Reader|no| |VM|0%|

Extensions (20)

Extension|Author (truncated)|Version ---|---|--- vscode-tailwindcss|bra|0.9.7 vscode-eslint|dba|2.4.0 vsc-material-theme-icons|equ|2.5.0 prettier-vscode|esb|9.10.4 git-graph|mhu|1.30.0 theme-monokai-pro-vscode|mon|1.2.0 vscode-docker|ms-|1.24.0 isort|ms-|2022.8.0 python|ms-|2023.2.0 vscode-pylance|ms-|2023.2.40 jupyter|ms-|2023.1.2010391206 jupyter-keymap|ms-|1.0.0 jupyter-renderers|ms-|1.0.14 vscode-jupyter-cell-tags|ms-|0.1.6 vscode-jupyter-slideshow|ms-|0.1.5 code-spell-checker|str|2.17.1 vscode-stylelint|sty|1.2.4 vscode-icons|vsc|12.2.0 gitblame|wad|10.1.0 vscode-todo-highlight|way|1.0.5 (6 theme extensions excluded)

A/B Experiments

``` vsliv368cf:30146710 vsreu685:30147344 python383:30185418 vspor879:30202332 vspor708:30202333 vspor363:30204092 vswsl492:30256859 vslsvsres303:30308271 pythonvspyl392:30443607 vserr242cf:30382550 pythontb:30283811 vsjup518:30340749 pythonptprofiler:30281270 vshan820:30294714 vstes263:30335439 pythondataviewer:30285071 vscod805cf:30301675 binariesv615:30325510 bridge0708:30335490 bridge0723:30353136 cmake_vspar411:30581797 vsaa593:30376534 pythonvs932:30410667 cppdebug:30492333 vsclangdc:30486549 c4g48928:30535728 dsvsc012cf:30540253 azure-dev_surveyone:30548225 vscccc:30610679 pyindex848:30662994 nodejswelcome1:30587005 3biah626:30602489 pyind779:30671433 89544117:30613380 pythonsymbol12:30671437 2i9eh265:30646982 funwalk2cf:30671525 ```

microsoft / TypeScript-TmLanguage

Broken syntax highlighting for generic function with optional type in Typescript JSX #967