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platformio-vscode-ide
PlatformIO IDE for VSCode: The next generation integrated development environment for IoT
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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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The PlatformIO extension currently requires Microsoft's proprietary C/C++ extension, so it can't (officially) be used in the Arch community build. Here's a feature request to remove the dependency on the C/C++ extension: https://github.com/platformio/platformio-vscode-ide/issues/1802
That's probably because you installed the FOSS Arch community build of VS Code, which is not allowed to use Microsoft's marketplace for legal reasons. So it uses the Open VSX Registry instead, a vendor-neutral marketplace without proprietary extensions.
You may find workarounds in that issue, but the simplest solution is to install Microsoft's proprietary distribution of VS Code called Visual Studio Code. You can either download a tar.gz archive from https://code.visualstudio.com or install the visual-studio-code-bin package from the Arch User Repository.