supports:创建一个清单该清单描述了levelup或abstract leveldown数据库的功能 源码

级别支持 创建清单描述的能力或分贝。 用法 const supports = require ( 'level-supports' ) db . supports = supports ( { bufferKeys : true , additionalMethods : { approximateSize : true } } ) 然后,数据库的接收者可以像下面这样使用它: if ( ! db . supports . permanence ) { throw new Error ( 'Persistent storage is required' ) } if ( db . supports . bufferKeys && db . supports . promises ) { await db . put ( Buffer . from ( 'key