Dynamodb Streams 中 AttributeValue 的不兼容类型

Question

我正在尝试借助unmarshall中提供的官方功能来解组 dynamodb 流记录@aws-sdk/util-dynamodb。

\n

我正在打字稿中执行此操作，定义如下所示

\n

unmarshall: (data: Record<string, AttributeValue>, options?: unmarshallOptions | undefined)

\n

这里AttributValue是源自@aws-sdk/client-dynamodb.

\n

dynamodb 记录的传入类型如下所示

\n

export interface DynamoDBRecord {\n    awsRegion?: string | undefined;\n    dynamodb?: StreamRecord | undefined;\n    eventID?: string | undefined;\n    eventName?: 'INSERT' | 'MODIFY' | 'REMOVE' | undefined;\n    eventSource?: string | undefined;\n    eventSourceARN?: string | undefined;\n    eventVersion?: string | undefined;\n    userIdentity?: any;\n}\n

\n

export interface StreamRecord {\n    ApproximateCreationDateTime?: number | undefined;\n    Keys?: { [key: string]: AttributeValue } | undefined;\n    NewImage?: { [key: string]: AttributeValue } | undefined;\n    OldImage?: { [key: string]: AttributeValue } | undefined;\n    SequenceNumber?: string | undefined;\n    SizeBytes?: number | undefined;\n    StreamViewType?: 'KEYS_ONLY' | 'NEW_IMAGE' | 'OLD_IMAGE' | 'NEW_AND_OLD_IMAGES' | undefined;\n}\n

\n

export interface AttributeValue {\n    B?: string | undefined;\n    BS?: string[] | undefined;\n    BOOL?: boolean | undefined;\n    L?: AttributeValue[] | undefined;\n    M?: { [id: string]: AttributeValue } | undefined;\n    N?: string | undefined;\n    NS?: string[] | undefined;\n    NULL?: boolean | undefined;\n    S?: string | undefined;\n    SS?: string[] | undefined;\n}\n

\n

这里的Attribute价值来自于@types/aws-lambda/trigger/dynamodb-stream.d.ts

\n

当我这样做时，unmarshall(dynamodbRecord.dynamodb.NewImage)我收到错误

\n

\n

类型参数 '{ [key: string]: AttributeValue; }' 不可分配给类型为“Record<string, AttributeValue>”的参数。\xc2\xa0\xc2\xa0索引签名不兼容。\xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0Type 'AWSLambda.AttributeValue' 不可分配给类型 'import("/Users/hitesh/learnapp/la-aws/node_modules/@aws-sdk/client- dynamodb/dist-types/models/models_0").AttributeValue'。\xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0Property '$unknown' 在类型“AttributeValue”中缺失，但在类型“$UnknownMember”中必需。

\n

\n

为什么我们对AttributeValuein@aws-sdk/client-dynamodb和的定义不同@types/aws-lambda/trigger/dynamodb-stream.d.ts？

\n

Answer 1

我在这里使用类型断言作为解决方法：

import type { AttributeValue } from '@aws-sdk/client-dynamodb'
// ...

unmarshall(dynamodbRecord.dynamodb.NewImage as Record<string, AttributeValue>)

我很乐意删除不必要的类型断言！