Description
Type: Bug
- Attempt to use the Instantiation Expressions in VSCode typescript language
function makeBox<T>(value: T){
return {value};
}
const makeStringBox = makeBox<string>;
const stringBox = makeStringBox('abc');- Observe Red squiggly lines that shouldn't be there.
VS Code version: Code - Insiders 1.70.0-insider (e9bda7aa4ff76648cfccc1a7bde465443803da71, 2022-08-02T16:56:25.649Z)
OS version: Windows_NT x64 10.0.19044
Modes:
System Info
| Item | Value |
|---|---|
| CPUs | Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz (16 x 3600) |
| GPU Status | 2d_canvas: enabled canvas_oop_rasterization: disabled_off 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 skia_renderer: enabled_on video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled |
| Load (avg) | undefined |
| Memory (System) | 31.92GB (17.88GB free) |
| Process Argv | |
| Screen Reader | no |
| VM | 0% |
A/B Experiments
vsliv695:30137379
vsins829:30139715
vsliv368:30146709
vsreu685:30147344
python383:30185418
vspor879:30202332
vspor708:30202333
vspor363:30204092
vslsvsres303:30308271
pythonvspyl392:30422396
pythontb:30258533
pythonptprofiler:30281269
vsdfh931:30280409
vshan820:30294714
pythondataviewer:30285072
vscod805:30301674
bridge0708:30335490
bridge0723:30353136
vsaa593cf:30376535
pythonvs932:30404738
wslgetstarted:30449409
vscscmwlcmt:30465136
cppdebug:30492333
vscaac:30438845
pylanb8912:30522163
vsclangdf:30492506
c4g48928:30535728
I've had this issue with both no npm packages installed. With typescript installed only. And with typescript and a tsconfig.json file.
Note: It is incredibly inconsistent. Sometimes it doesn't happen. Other times changing from the built-in version of typescript to the local version fixes it, sometimes just waiting fixes it. Until you change the code at all (adding/removing whitespace for example) and then it comes back. Installing a different version of typescript removes the error until you change the code as well.
I believe that this is a VSCode centric issue and not a Typescript issue for 2 reasons.
- Running
npx tscbuilds the package just fine without any issues from type errors. - As seen in this comment, the typescript playground doesn't show any errors with this. Instantiation expressions #47607 (comment) TS Playground