src/vs/workbench/contrib/tasks/common/taskConfiguration.ts/isCustomTask
	function isCustomTask(value: CustomTask | ConfiguringTask): value is CustomTask {
		let type = value.type;
		let customize = (value as any).customize;
		return customize === undefined && (type === undefined || type === null || type === Tasks.CUSTOMIZED_TASK_TYPE || type === 'shell' || type === 'process');
	}