---
title: "@smithy/smithy-client Breaking Changes on npm | Since.dev"
description: "What each @smithy/smithy-client release removed, renamed or changed: 261 breaking changes in 1 version on npm, each with its source."
canonical_url: https://since.dev/packages/npm/@smithy/smithy-client
last_updated: 2026-05-08
---

# @smithy/smithy-client breaking changes

Every breaking API change we have recorded in @smithy/smithy-client on npm: 261 breaking changes in 1 version. Below are its newest version, removals and renames first, each with its source.

Newest change May 8, 2026

## 4.13.0

261 breaking changes, first published May 8, 2026.

- **Removed** `Client.config`  

Client.config was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Client.constructor`  

new Client() was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Client.destroy`  

Client.destroy was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Client.initConfig`  

Client.initConfig was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Client.middlewareStack`  

Client.middlewareStack was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Client.send`  

Client.send was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Command.classBuilder`  

Command.classBuilder was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Command.input`  

Command.input was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Command.middlewareStack`  

Command.middlewareStack was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)
- **Removed** `Command.resolveMiddleware`  

Command.resolveMiddleware was removed in @smithy/smithy-client 4.13.0 [npmjs.com](https://www.npmjs.com/package/@smithy/smithy-client/v/4.13.0)

And 251 more in this version.

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