src/vs/workbench/services/themes/common/colorThemeData.ts/ColorThemeData/type
class ColorThemeData:	get type(): ColorScheme {
		switch (this.baseTheme) {
			case VS_LIGHT_THEME: return ColorScheme.LIGHT;
			case VS_HC_THEME: return ColorScheme.HIGH_CONTRAST;
			default: return ColorScheme.DARK;
		}
	}