cdktf 可选块

Question

如果未提供以下块的值，如何使块可选？

const BackupType=new TerraformVariable(this,"BackupType",{
      description:"(Required) The type of the backup. Possible values are Continuous and Periodic. Defaults to Periodic. Migration of Periodic to Continuous is one-way, changing Continuous to Periodic forces a new resource to be created."
    })
    const  BackupIntervalInMinutes=new TerraformVariable(this,"BackupIntervalInMinutes",{
      description:"(Optional) The interval in minutes between two backups. This is configurable only when type is Periodic. Possible values are between 60 and 1440."
    })
   const  BackupRetenti`enter code here`onInHours=new TerraformVariable(this,"BackupRetentionInHours",{
      description:"(Optional) The time in hours that each backup is retained. This is configurable only when type is Periodic. Possible values are between 8 and 720."
    })
   const  BackupStorageRedundancy=new TerraformVariable(this,"BackupStorageRedundancy",{
      description:"(Optional) The storage redundancy which is used to indicate type of backup residency. This is configurable only when type is Periodic. Possible values are Geo, Local and Zone."
    }) 

backup:{
      type:BackupType.value,
      intervalInMinutes:BackupIntervalInMinutes.value,
      retentionInHours:BackupRetentionInHours.value,
      storageRedundancy:BackupStorageRedundancy.value,
    },

Answer 1

如果未传递 terraform 变量，则该值将被合成为输入的引用，但在编译时它将没有数据，因此应以与未传递相同的方式处理。