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@smithy/types
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This package is mostly used internally by generated clients. Some public components have independent applications.
| undefined
from input and output structuresGenerated shapes' members are unioned with undefined
for
input shapes, and are ?
(optional) for output shapes.
If you would like to skip these steps, use the AssertiveClient
or
UncheckedClient
type helpers.
Using AWS S3 as an example:
import { S3 } from "@aws-sdk/client-s3";
import type { AssertiveClient, UncheckedClient } from "@smithy/types";
const s3a = new S3({}) as AssertiveClient<S3>;
const s3b = new S3({}) as UncheckedClient<S3>;
// AssertiveClient enforces required inputs are not undefined
// and required outputs are not undefined.
const get = await s3a.getObject({
Bucket: "",
Key: "",
});
// UncheckedClient makes output fields non-nullable.
// You should still perform type checks as you deem
// necessary, but the SDK will no longer prompt you
// with nullability errors.
const body = await (
await s3b.getObject({
Bucket: "",
Key: "",
})
).Body.transformToString();
This is mostly relevant to operations with streaming bodies such as within the S3Client in the AWS SDK for JavaScript v3.
Because blob payload types are platform dependent, you may wish to indicate in your application that a client is running in a specific environment. This narrows the blob payload types.
import { GetObjectCommand, S3Client } from "@aws-sdk/client-s3";
import type { NodeJsClient, SdkStream, StreamingBlobPayloadOutputTypes } from "@smithy/types";
import type { IncomingMessage } from "node:http";
// default client init.
const s3Default = new S3Client({});
// client init with type narrowing.
const s3NarrowType = new S3Client({}) as NodeJsClient<S3Client>;
// The default type of blob payloads is a wide union type including multiple possible
// request handlers.
const body1: StreamingBlobPayloadOutputTypes = (await s3Default.send(new GetObjectCommand({ Key: "", Bucket: "" })))
.Body!;
// This is of the narrower type SdkStream<IncomingMessage> representing
// blob payload responses using specifically the node:http request handler.
const body2: SdkStream<IncomingMessage> = (await s3NarrowType.send(new GetObjectCommand({ Key: "", Bucket: "" })))
.Body!;
FAQs
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The npm package @smithy/types receives a total of 18,597,313 weekly downloads. As such, @smithy/types popularity was classified as popular.
We found that @smithy/types demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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