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typescript-lit-html-plugin
TypeScript server plugin that adds intellisense for lit-html template strings
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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typescript-styled-plugin
Discontinued TypeScript server plugin that adds intellisense to styled component css strings
Check out https://github.com/Microsoft/typescript-lit-html-plugin which will add support inside typescript (tsserver via typescript-language-server)
well, in theory https://github.com/runem/lit-analyzer/tree/master/packages/ts-lit-plugin should be enough. But the CSS and HTML part seems to be only partly working. CSS not at all, and HTML at least gives autocompletion for components, but f.e. not diagnostics or codeactions.
For CSS i'm currently also using https://github.com/microsoft/typescript-styled-plugin.