The extension is running from an --extensionDevelopmentPath provided when launching the editor.
--extensionDevelopmentPath
The extension is installed normally (for example, from the marketplace or VSIX) in the editor.
The extension is running from an --extensionTestsPath and the extension host is running unit tests.
--extensionTestsPath
The extension is running from an
--extensionDevelopmentPathprovided when launching the editor.