In my case it's VS Code. Writing plain CSS is less productive in such an editor.
I use a combination of vscode-styled-components and prettier which works out pretty well.
So it only highlights the properties. Any solution for autocompleting of properties?
I tried https://github.com/lXSPandora/vscode-styled-components-snippets but failed to make it work at current.
@jiyinyiyong -- You want this -- https://github.com/Microsoft/typescript-styled-plugin
Took me sometime to figure it out. VS Code uses 2.5.3 by default, but the plugin only works with 2.6.1 I installed in node_modules/. After that it looks great!
@jiyinyiyong -- You want this -- https://github.com/Microsoft/typescript-styled-plugin
So apparently vscode-styled-components is now all you need. What a time to be alive!

Found myself already installed it.. are they the same?

so many versions of this all with the same logo, but different creators...
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I use a combination of vscode-styled-components and prettier which works out pretty well.