@smithy/util-middleware

An internal package

This package provides shared utilities for middleware.

Usage

You probably shouldn't, at least directly.

Smithy Typescript Codegen Changelog

0.36.1 (2025-10-06)

Features

• Added 'pnpm' to 'PackageManager' (#1658)

Bug Fixes

• Fixed CBOR eventstream codegen (#1731)

0.36.0 (2025-09-30)

Features

• Upgraded smithy version to 1.62.0 (#1714)
• Replaced 'uuid' with '@smithy/uuid' (#1706)

0.35.0 (2025-09-18)

Features

• Command class examples now generate with a reference to the Client constructor input type (#1690)

Bug Fixes

• Fixed header type codegen for event streams (#1694)

0.34.1 (2025-09-10)

Bug Fixes

• Fixed event stream serialization when the @eventStreamPayload member is a string (#1674)

0.34.0 (2025-07-30)

Features

• Upgraded smithy version to 1.61.0 (#1640)

0.33.0 (2025-07-10)

Features

• Upgraded smithy version to 1.60.3 (#1640)
• Upgraded fast-xml-parser to 5.2.5 (#1641)

Bug Fixes

• Avoided using model.getServiceShapes() for endpoint generation (#1642)

0.32.0 (2025-06-26)

Features

• BigIntger and BigDecimal numeric support for Smithy RPCv2 CBOR protocol (#1603)

0.31.1 (2025-06-23)

Bug Fixes

• use undefined placeholder for unhandled trait (#1629)
• Added EndpointRequired config resolver to replace CustomEndpoint (#1628)
• Corrected criteria for event stream member detection (#1624)
• Located event stream member more carefully (#1623)

Chores

• Omitting the endpoint polymorphs from resolved config types (#1626)
• Allowed protocol generators to declare error aliases (#1622)
• Allowed endpoint params to be explicitly undefined if not required (#1618)

0.31.0 (2025-06-09)

Features

• Upgraded smithy version to 1.58.0 (#1616)
• Added schema code generation and related allow-list (#1599)

Chores

• Updated synthetic error namespace (#1611)
• Generated default endpoint ruleset to make code generation consistent for ruleset trait (#1589)

0.30.0 (2025-05-08)

Features

• Upgraded smithy version to 1.57.1 (#1576)
• Added authSchemePreference client config (#1567)
• Improved generated protocol test assertion messages (#1572)

Bug Fixes

• Allowed overwriting a protocol's priority during protocol selection (#1585)

0.29.1 (2025-04-24)

Chores

• Bumped version to match release of smithy-aws-typescript-codegen

0.29.0 (2025-04-11)

Features

• Upgraded smithy version to 1.55.0 (#1560)

Bug Fixes

• Fixed bug with JMESPath flatten level codegen (#1559)

0.28.0 (2025-04-01)

Bug Fixes

• Used backticks for example strings containing doublequotes (#1556)
• Generated client.initConfig reference for tracking config object custody (#1550)
• Used generic type for client config (#1549)
• Allowed authscheme resolver to access client ref (#1548)

Documentation

• Added doc examples to operations (#1078)
• Replaced GitHub org from 'awslabs' to 'smithy-lang' (#1545)

0.27.0 (2025-03-04)

Features

• Support MultiSelect List in OperationContextParams (#1536)
• Support MultiSelect Flatten in OperationContextParams (#1537)
• Upgrade smithy version to 1.53.0 (#1538)
• Upgrade smithy version to 1.54.0 (#1540)

Bug Fixes

• Fixed union member serialization in CBOR (#1526)
• Fixed allocation of strings starting with underscore and other cases (#1527)

Documentation

• Moved description block before deprecated tag (#1516)

0.26.0 (2025-01-22)

Features

• Dropped support for Node.js 16 (#1487)
• Upgraded smithyGradleVersion to 1.2.0 (#1499)
• Passed client configuration to loadNodeConfig calls (#1471)
• Removed String extension in LazyJsonString (#1468)
• Upgraded vitest to 2.1.8 (#1496)

Bug Fixes

• Fixed code generation issue for operationContextParam (#1475)
• Resolved obj and array JS literals from JMESPath types for waiters (#1462)

0.25.0 (2024-11-18)

Features

• Upgraded smithyVersion to 1.52.0 (#1434)
• Added default accepts=application/cbor header for Smithy RPC v2 CBOR protocol (#1427)
• Added | undefined for optional type properties to support exactOptionalPropertyTypes (#1448)

Bug Fixes

• Added uuid types import when adding uuid import (#1428)

0.24.0 (2024-09-30)

Features

• Use spread operator for Command endpoint params only when necessary (#1396)
• Improve IDE type navigation assistance for command classes (#1373)

Bug Fixes

• Allow empty string field values for headers (#1412)

0.23.0 (2024-09-09)

Features

• codegen: Added Smithy RPCv2 CBOR protocol generator (#1280)

• codegen: Added support for string array parameters in endpoints (#1376)

• codegen: Added support for operation context params in endpoints (#1379)

Bug Fixes

• Added logic to resolve the service specific endpoint once per client instance instead of for each request (#1382)

• Fixed a bug that prevented a concrete client type (e.g., S3Client) to be converted to a NodeJsClient (#1389)

Documentation

0.22.0 (2024-08-06)

Features

• codegen: Enabled the new identity and auth behavior by default and add a legacy auth mode (#1352)

• codegen: Added logic to skip the application of the CustomEndpoints plugin for models using Endpoints-2.0 (#1337)

• codegen: Added automatic default idempotency tokens in headers for requests when a token is not explicitly provided (#1327)

• codegen: Added a set of built-in integration plugins to code-generator (#1321)

Bug Fixes

• codegen: Fixed inconsistent ordering issue when writing client params during code-generation (#1355)

• codegen: Fixed incorrect usage of string templates when generating commands (#1354)

• codegen: Fixed serialization of :event-type in event-streams where the member target-id was being used instead of the member name (#1349)

• codegen: Fixed issue where content-type was being set when input body was empty (#1304)

0.21.1 (2024-06-05)

Features

• Added logging for CredentialsProviderError (#1290)

Bug Fixes

• Fixed issues with serializing millisecond precision timestamps for certain formats (#1289, #1295)
• Fixed issue where export was used instead of the clearer export type (#1284)

0.21.0 (2024-05-22)

Breaking Changes

• Update Engines to Node.js 16, Node.js 14 is not officialy supported anymore (#1258)

Features

• Bumped TypeScript to ~5.2.x in smithy JS packages (#1275)
• @smithy/fetch-http-handler, @smithy/node-http-handler: Improveed stream collection performance (#1272)
• Improved support for fetch and web-streams in Node.js (#1256)
• @smithy/node-http-handler, "@smithy/util-stream: Handle web streams in streamCollector and sdkStreamMixin
• Added service client doc generator only when typedoc is selected (#1253)

Bug Fixes

• @smithy/types: Fixed type transforms account for no-args operation methods (#1262)
• Check dependencies when adding imports (#1239)
• Fixed typo in HttpResponse docs (#958)
• Fixed URI escape path (#1224) (#1226)

0.20.1 (2024-04-05)

Features

• Updated SigV4 with its own header formatter to avoid import of entire eventstream-codec package (#1233)
• Updated Smithy Version to 1.47.0 (#1225)

Bug Fixes

• Fix middleware-endpoint to check for s3 arn parts (#1227)

0.20.0 (2024-03-21)

Features

• codegen: Identity and Auth, support for the @auth Smithy trait. See https://smithy.io/2.0/spec/authentication-traits.html#auth-trait.
• codegen: Support request compression (#1129)
• codegen: Allow commands to be constructed without arg if all arg fields optional (#1206)
• codegen: Generate unified error dispatcher (#1150)
• codegen: Generate Commands using Command classBuilder (#1118)
• codegen: Paginator factory (#1115)
• codegen: Generate paginators using a factory (#1114)
• codegen: XML serde reduction (#1108)
• codegen: Add requestBuilder, generate requests using a builder pattern (#1107)
• codegen-docs: Add deprecation message in shape docs (#1209)
• codegen-docs: Move documentation before release tag and deprecation (#1211)
• codegen-docs: Move deprecation after description in docs (#1212)
• codegen-docs: Add more information about BLOB values in structures (#1182)
• @smithy/types: Assertive client type helper (#1076)
• @smithy/*: dist-cjs artifacts are now generated as a bundle (#1146)
• @smithy/util-base64: Encoders now accept strings (#1176)
• @smithy/node-http-handler: Enable ctor arg passthrough for requestHandler (#1167)
• @smithy/node-http-handler: Add checked socket exhaustion warning when throughput is slow (#1164)
• @smithy/node-http-handler: Allow http(s).Agent ctor arg in lieu of instance (#1165)
• @smithy/node-http-handler: Reduce buffer copies (#867)

Bug Fixes

• codegen: Empty the contents of the dependencyVersions.properties file when creating it (#1213)
• codegen: Import _json function at call sites (#1174)
• codegen: Model bucketing edge case with resource shape (#1123)
• codegen: Use TopDownIndex::getContainedOperations() for operation iterations (#1109)
• codegen: Accommodate services with the world Client in their names (#1102)
• @smithy/middleware-retry: Retry after clock skew correction (#1170)
• @smithy/middleware-retry: Warn streaming requests are not retryable (#1092)
• @smithy/core: Handle multi-part token paths in paginator (#1160)
• @smithy/util-utf8: Use Node.js implementations in react-native (#1070)
• @smithy/smithy-client: Apply filtering when walking json arrays (#1086)
• @smithy/util-body-length-browser: Increase performance of body length calculation for larger payloads on browser (#1088)
• @smithy/middleware-serde: Allow error deserializers to populate error response body (#1180)
• @smithy/shared-ini-file-loader: Process sso-session names with config prefix separator (#1173)
• @smithy/shared-ini-file-loader: Process config files for profile names containing prefix separator (#1100)
• @smithy/shared-ini-file-loader: Allow dot, solidus, percent and colon characters in profile names (#1067)

Documentation

• Add readme content for signature-v4 (#1087)
• Sigv4 README.md brackets (#1103)
• Fix README smithy-build.json examples (#1082)

0.19.0 (2023-11-02)

Features

• Updated codegen plugins to match idiomatic plugin names(#1057)
• Added flag for blocking imds v1 fallback behavior (#1059)
• Upgraded@babel/traverse from 7.21.2 to 7.23.2 (#1041)
• Upgraded browserify-sign from 4.2.1 to 4.2.2 (#1058)
• Updated to use migrated util-endpoints (#1044)
• Re-exported existing endpoint types (#1055)
• Added util-endpoints package (#1043)
• Allow TypeScriptIntegration to write prior to the config object literal (#1054)
• Updated to transform inputs for platform specific type helpers (#1046)
• Made unionShape deserializer overridable (#1040, #1045)
• Update to generate enum Record keys when target is enum (#1037)
• Removed "| string" and "| number" from enum targeted members (#1028)
• Added -p for mkdir in build-generated-test-packages (#1010)
• Added logging for buildAndCopyToNodeModules() (#1003)
• Reorganized models in smithy-typescript-codegen-test (#995)
• Updated to export empty model index if no model_* files exist (#996)
• Read service specific endpoints for environment or config (#1014)
• Updated to populate sso-session and services sections when loading config files (#993)
• Added export CONFIG_PREFIX_SEPARATOR from loadSharedConfigFiles (#992)
• Updated to pass configuration file as second parameter to configSelector (#990)
• Updated to populate subsection using dot separator in section key when parsing INI files (#989)
• Added support for reading values from main section when parsing INI files (#986)

Bug Fixes

• Exported RuntimeExtension and Client ExtensionConfiguration interfaces (#1057)
• Removed TARGET_NAMESPACE from TypeScriptSettings (#1057)
• Updated Server Codegen to generate without a protocol (#1057)
• Updated to use partial record for enum keyed types (#1049)
• Allowed lowercase type names for endpoint parameters (#1050)
• Added parsing for profile name with invalid '+' character (#1047)
• Added missing map shape reference (#1038)
• Adds parsing for profile name with invalid '@' character (#1036)
• Treat absence of prefix whitespace as section keys when reading ini files (#1029)
• Added missing dependency of @smithy/shared-ini-file-loader (#1027)
• Fixed operation index file codegen (#1025)
• Removed extra $ from HttpApiKeyAuthSigner (#1006)
• Added await to signer.sign() in httpSigningMiddleware (#1005)
• Fixed @httpApiKeyAuth scheme property (#1001)
• Fixed HttpAuthSchemeParameters codegen (#998)
• Fixed resolveHttpAuthSchemeConfig imports (#997)
• Updated default keepalive=false for fetch (#1016)

0.18.0 (2023-10-04)

Features

• Add SSDK codegen test (#825)
• Add test script when specs are generated (#821)
• Move vitest config to js (#833)
• Add PackageContainer interface (#837)
• Add codegen for improved streaming payload types (#840)
• Set public release tags on client config interface components (#850)
• Check for Optional Configuration in client constructor (#859)
• Add matchSettings() to RuntimeClientPlugins (#856)
• Add experimentalIdentityAndAuth flag (#857)
• Add extensions to client runtime config (#852)
• Use ASCII replacement for character 0xE2 (#866)
• Add more auth traits to generic client tests (#882)
• Rename defaultClientConfiguration to defaultExtensionConfiguration (#888)
• Update codegen to use defaultExtensionConfiguration (#889)
• Add matchSettings() to TypeScriptIntegration and TypeScriptCodegenPlugin (#901)
• Add codegen and TS integration points for config (#881)
• Add generic @httpApiKeyAuth support (#883)
• Add generic @httpBearerAuth support (#884)
• Add generic @aws.auth#sigv4 support (#885)
• Update HttpAuthOption and HttpAuthScheme codegen (#907)
• Update ExtensionConfigurations to generate for clients only (#911)
• Add codegen for http component in runtime extension (#913)
• Add codegen for HttpAuthExtensionConfiguration (#910)
• Add HttpAuthScheme interfaces for auth scheme resolution (#928)
• Add service and operation names to HandlerExecutionContext (#934)
• Add httpSigningMiddleware to authorize and sign requests (#930)
• Make writeDocs() with Runnable public (#939)
• Refactor HttpAuthScheme properties to builders (#941)
• Reorganize http auth module constants (#942)
• Rename to generateDefaultHttpAuthSchemeProviderFunction() (#946)
• Add traitId to HttpAuthScheme (#947)
• Add customizing default httpAuthSchemeProvider and httpAuthSchemeParametersProvider (#943)
• Add partial support for aws.auth#sigv4a (#950)
• Update @smithy.rules#endpointRuleSet codegen (#945)
• Add collect*() methods to dedupe ConfigFields and HttpAuthSchemeParameter (#948)
• Add httpAuthSchemeMiddleware to select an auth scheme (#929)
• Add SmithyContextCodeSection to CommandGenerator (#957)
• Add link for retryModes input enum (#962)
• Add aliases for httpSigningMiddleware (#970)
• Update endpoint rules engine tests (#976)
• Upgrade to Smithy 1.39.0 (#976)

Bug fixes

• Fix types import (#831)
• Allow lowercase endpoint param (#923)
• Generate jsdocs for operations with no documentation (#971)
• Fix missing release tag on shape members (#854)

0.17.1 (2023-07-07)

Bug fixes

• Fixed @smithy/protocol-http import in HttpApiKeyAuth spec (#817)

0.17.0 (2023-07-06)

Features

• Upgraded to Smithy 1.33.0 (#808)
• Updated enum validator to not remove "internal" tagged members (#807)

Bug fixes

• Fixed @aws-smithy/server-common version (#806)

0.16.0 (2023-06-30)

Features

• Updated code generator to use @smithy scoped npm packages (#791, #766)
• Improved blob payload input and output types (#777)
• Added packageDocumentation and improved interface inheritance (#770)
• Updated code generator to use runtime-agnostic util-stream package (#775)

Bug fixes

• Fixed endpoint parameter name conflict (#772)
• Stopped trimming collection query param output values (#764)

0.15.0 (2023-05-10)

Features

• Add Gradle composite build (#761)
• Improve generated command documentation (#757)
• Bump SSDK libs version to 1.0.0-alpha.10 (#738)
• Use aggregated client runtime generator (#736)
• Add SerdeElision KnowledgeIndex and serde helper function (#735, #759)
• Shorten internal serde function names (#730)
• Reduce generated HTTP request header code (#729)
• Improve documentation truncation (#728)
• Export enum as const to reduce generated code (#726)
• Add structural hint to commmand examples (#723)
• Skip generating unused sensitive filter functions (#722)
• Add DefaultReadmeGenerator (#721)
• Add TSDocs release tags (#719)
• Add thrown exceptions to generated command documentation (#715)
• Remove internal enum values from validation message (#713)
• Omit aggregated client from paginators (#712)
• Add NodeJS runtime support to SSDK (#703)
• Remove reflected values from validation message (#695)
• Add AddClientRuntimeConfig for generic clients (#693)

Bug Fixes

• Fix creating empty model files when chunking (#714)

0.14.0 (2023-02-09)

Features

• Upgrade TypeScript lib to use es2018 for SSDK libs (#678)
• Bump SSDK libs version to 1.0.0-alpha.8 (#689)
• Add a code generator setting to generate @required members without | undefined. WARNING: Using this mode may lead to backwards incompatible impact for clients when a service removes @required from a member. (#566, #688)

0.13.0 (2023-01-31)

Features

• Upgrade tsconfig.es.json target to ES2020 (#603)
• Upgrade to Java 17 (#621)
• Upgrade to node >= 14.0.0 (#623, #625, #628)
• Upgrade to Smithy 1.27.2 (#682)
• Add mavenCentral as plugin repository (#629)
• Add intEnum generation with validation and tests (#605, #654)
• Use util-base64 instead of platform-based dependencies (#627, #631)
• Use util-base8 instead of platform-based dependencies (#672, #677)
• Add util-retry dependency (#650)
• Replace Hash with Checksum (#668)
• Allow deferred resolution for api key config (#588)
• Stream improvement serde (#593)
• Support delegation of determining errors for an operation (#598)
• Reduce object copying in iterators (#638)
• Refactor writeAdditionalFiles and writeAdditionalExports logic into integration.customize() (#607)
• Expose static endpoint param instructions provider (#590)
• Add unit tests for endpoints v2 generator (#674)
• Use util-utf8 on server and tests ()
• Bump ssdk lib version to 1.0.0-alpha.7(#675)
• Clients parse datetime offsets (#681)

Bug Fixes

• Call parseErrorBody when parsing error structures (#597)
• Fix broken reference to fail() after jest-upgrade (#645)
• Validate required input query params (#647, #646)
• Include x-amz-request-id in request id deser (#606)
• Add idempotencyToken generation if member is queryParam (#655)
• Fix Error printout for protocol-response tests (#657)
• Fix codegen for windows platforms (#661)
• Fix consistency with type aliases (#670, #671)
• Fix misc endpoints 2.0 bugs (#592, #600, #614, #615, #616, #617, #618, #619, #622, #626, #634, #644, #652, #658)

0.12.0 (2022-09-19)

Features

• Migrated the code generator to use Smithy's new and recommended DirectedCodegen. (#585)
• Added support for endpoints v2. (#586)
• Updated Smithy version to 1.25.x which bring Smithy IDL v2 support. (#589)
• Updated SSDK library version to 1.0.0-alpha6. (#583)
• Added different package description for client v/s server. (#582)
• Overrode typescript version for typedoc. (#561)
• Removed namespaces that only contain log filters. (#574)
• Added support for event stream for RPC protocols. (#573)
• Added fallback to status code for unmodeled errors. (#565)
• Added support for generating protocol specific event payload. (#554)
• Used Record type instead of Object. (#556, #557, #558, #562)
• Removed explicit reference to MetadataBearer from error shapes. (#545)
• Added codegen indicator comment to generated files. (#538)
• Added check to stop pagination on same token. (#534)

Bug Fixes

• Fixed code generation for server protocol tests. (#577)
• Fixed missing Content-Type header in some events. (#567)

0.11.0 (2022-04-04)

Features

• Removed MetadataBearer from output type. (#530)
• Updated Smithy version to 1.19.x. (#531)
• Updated typescript to ~4.6.2. (#527)
• Set bodyLengthChecker type to BodyLengthCalculator. (#524)

Bug Fixes

• Added missing export for httpApiKeyAuth middleware. (#528)

0.10.0 (2022-03-02)

Features

• Bumped SSDK library versions to 1.0.0-alpha5. (#520)
• Added support for List<String> in function parameters list. (#516)
• Updated generation of exceptions for easier handling. (#502)
• Updated clean script to delete *.tsbuildinfo. (#514)

Bug Fixes

• Fixed scripts for npm by extracting run command out. (#519)
• Fixed the generation of collections of documents in protocol tests. (#513)

0.9.0 (2022-02-14)

Features

• Updated Smithy version to 1.17.x. (#505)
• Added support for @httpApiKeyAuth. (#473)
• Added a default prepack script to generated packages. (#479)
• Added TypeScript contextual keywords to the reserved words list. (#500)
• Changed generated builds to run concurrently. (#498)
• Added support for defaultsMode. (#495)
• Updated generated packages to use @tsconfig/recommended. (#493)
• Removed filterSensitiveLog from exceptions. (#488)
• Bumped SSDK library versions to 1.0.0-alpha4. (#480)
• Removed test dependencies and configuration from generated packages. (#483)
• Updated minimum supported Node version to 12. (#481, #482)
• Added option to configure package manager, supporting yarn and npm. (#476)
• Switched pattern validation to re2-wasm to avoid native dependency. (#467)

Bug Fixes

• Updated protocol tests to check for ErrorName. (#490)
• Added escaping for regex literals in path segments. (#477)
• Fix greedy label matching. (#474)

Documentation

• Updated README example. (#501)

0.8.0 (2021-11-23)

Features

• Updated Smithy version dependency to be more specific. (#465)
• Updated Smithy version to 1.14.x. (#468)

Bug Fixes

• Fixed the generated comment for link to client config. (#466)

0.7.0 (2021-11-03)

Features

• Updated parsing of timestamps and unions to be stricter. (#412, #414)
• Reduced published package size. (#427, #443, #446, #444, #452)
• Added handling for more complex Accept header values. (#431)
• Moved source files to src folder. (#434, #437, #438)
• Added ability to ts-ignore a default import. (#445)
• Updated Smithy version to 1.12.0. (#448)
• Switched to re2 for pattern validation. (#451)

Bug Fixes

• Used base64 en/decoder from context in bindings. (#419)
• Downgraded typescript to ~4.3.5. (#418)
• Fixed XML protocol test to compare payload with outmost node. (#433)
• Fixed handling of multi-value query parameters to align with API Gateway behavior. (#449)

0.6.0 (2021-09-02)

Features

• Updated parsing of request and response payloads for Http binding protocols to be stricter. (#405)
• Updated number parsing to be stricter based on size. (#397, #404)
• Added handling for Content-Type and Accept headers in SSDK. (#394)
• Added a generator for @httpMalformedRequestTests. (#393)
• Added warning for unsupported Node.js version. (#392)

Bug Fixes

• Allowed setting prefix path for rpc protocols. (#406)
• Fixed SSDK codegen for different casing of operation name, by using operation symbol name consistently. (#402)
• Fixed processing of runtime config for generic clients. (#401)

0.5.0 (2021-07-23)

Features

• Bumped tslib version to 2.3.0. (#387)
• Calculate content-length for SSDKs. (#386)

Bug Fixes

• Update dependency versioning to pull from smithy-aws-typescript-codegen or use latest. (#388)