Intellisense for JavaScript how?

[axnaz]

Project:
CompletionTest.zip

Made Intellisense as in the tutorial
and added ContentType for JavaScript

https://docs.microsoft.com/en-us/visualstudio/extensibility/walkthrough-displaying-statement-completion?view=vs-2022&tabs=csharp

Only works for "plaintext"
Doesn't work for "JavaScript"

(win11 vs2022 and vs2019 - dont work for js)

PLS help!!!
i need to work for javascript