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AWS SDK for JavaScript v3

Package Structure

• @aws-sdk/client-* — one per service, generated by smithy-typescript; one-to-one with AWS services and operations
• @aws-sdk/lib-* — higher-level helpers (e.g. lib-dynamodb, lib-storage)
• @aws-sdk/* (no prefix) — utility packages (mostly internal; don't import deep paths)

Always import from the package root:

import { S3Client } from "@aws-sdk/client-s3"; // correct
// NOT: import { S3Client } from "@aws-sdk/client-s3/dist-cjs/S3Client"

Two Client Styles