Dom lib required for TS to compile in Node app

[mikewim]

Describe the bug

Dom lib required by typescript in order to successfully compile node app

Your environment

SDK version number

@aws-sdk/lib-dynamodb@3.36.0

Is the issue in the browser/Node.js/ReactNative?

Node.js

Details of the Node.js

v12.22.4

Steps to reproduce

• Create a fresh TS workspace
• Set minimal tsconfig.json and do not include "dom" in lib array
• Install @aws-sdk/lib-dynamodb@3.36.0
• import { DynamoDBDocumentClient } from "@aws-sdk/lib-dynamodb"; into hello world file
• run tsc to compile project

Observed behavior

The source code fails to compile with error:

Expected behavior

lib installed into node app should not require "dom" types to compile

Additional context

If you add "dom" to lib array in tsconfig.json, source code will compile successfully

[simonbuchan]

Getting typescript isomorphic code to compile without assertions across environments generally sucks, but in the public interface looks something like:

// Declare interfaces that will get merged with the real definitions in lib.dom and @types/node
declare global {
  export interface ReadableStream {}

  export namespace NodeJS {
    export interface Readable {}
  }

  // ...
}

export type InputStream = ReadableStream | NodeJS.Stream;

Really, it's missing a typescript feature, maybe declare interface ReadableStream {} that evaluates to never if not otherwise defined?

[ibqn]

I hit this error with @aws-sdk/util-dynamodb package

$ yarn build
yarn run v1.22.10
$ tsc
lambda-fns/node_modules/@aws-sdk/util-dynamodb/dist-types/ts3.4/models.d.ts:12:59 - error TS2304: Cannot find name 'Blob'.
12 export declare type NativeAttributeBinary = ArrayBuffer | Blob | Buffer | DataView | File | Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array;
                                                             ~~~~

lambda-fns/node_modules/@aws-sdk/util-dynamodb/dist-types/ts3.4/models.d.ts:12:86 - error TS2304: Cannot find name 'File'.
12 export declare type NativeAttributeBinary = ArrayBuffer | Blob | Buffer | DataView | File | Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array;
                                                                                        ~~~~


Found 2 errors.

error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[jfirebaugh]

For discussions of how this might be fixed, see https://stackoverflow.com/questions/65848540 and microsoft/TypeScript#31894.

[thw0rted]

Sadly I think the most common solution you'll find in the wild is people adding a triple-slash reference to DOM types, which, yes, pollutes the global namespace of anyone who includes your library with all the DOM types.

You might also be interested in following microsoft/TypeScript-DOM-lib-generator#1207 which, if implemented, could allow you to import individual types from the DOM without having them exist in global scope.

[github-actions]

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