fix: preserve inside triple-slash.directive

[RedCMD]

fixes #1066

• typescript-basics: fix highlighting for triple-slash reference directives with preserve="true" #1066

[jeffy-g]

Nice fix, thanks!

One question: will this also be propagated to VS Code’s derived JavaScript/JSX TextMate grammars? VS Code notes that JavaScript.tmLanguage.json is derived from TypeScriptReact.tmLanguage from this repo.

Currently, in .js files /// <reference ... preserve="true" /> still falls back to a regular line comment highlight. If propagation is out of scope here, should we track it as a follow-up in VS Code?

[RedCMD]

https://github.com/microsoft/vscode/blob/main/extensions/javascript/syntaxes/Readme.md
claims it'll propagate
and this PR seems to suggest so microsoft/vscode#232238

the bigger problem is that the grammar in this repo hasn't been updated in years