src/vs/platform/userDataSync/common/settingsMerge.ts/getIgnoredSettingsFromConfig
function getIgnoredSettingsFromConfig(configurationService: IConfigurationService): ReadonlyArray<string> {
	let userValue = configurationService.inspect<string[]>('settingsSync.ignoredSettings').userValue;
	if (userValue !== undefined) {
		return userValue;
	}
	userValue = configurationService.inspect<string[]>('sync.ignoredSettings').userValue;
	if (userValue !== undefined) {
		return userValue;
	}
	return configurationService.getValue<string[]>('settingsSync.ignoredSettings') || [];
}