chore(core/httpAuthSchemes): fix type declaration of resolved credentials

Author: kuhe

packages/core/src/submodules/httpAuthSchemes/aws_sdk/resolveAwsSdkSigV4Config.ts

@@ -1,5 +1,5 @@
 import { setCredentialFeature } from "@aws-sdk/core/client";
-import { AttributedAwsCredentialIdentity } from "@aws-sdk/types";
+import type { AttributedAwsCredentialIdentity, MergeFunctions } from "@aws-sdk/types";
 import {
   doesIdentityRequireRefresh,
   isIdentityExpired,
@@ -81,9 +81,8 @@ export interface AwsSdkSigV4AuthResolvedConfig {
   /**
    * Resolved value for input config {@link AwsSdkSigV4AuthInputConfig.credentials}
    * This provider MAY memoize the loaded credentials for certain period.
-   * See {@link MemoizedProvider} for more information.
    */
-  credentials: AwsCredentialIdentityProvider;
+  credentials: MergeFunctions<AwsCredentialIdentityProvider, MemoizedProvider<AwsCredentialIdentity>>;
   /**
    * Resolved value for input config {@link AwsSdkSigV4AuthInputConfig.signer}
    */

packages/types/src/function.spec.ts

@@ -0,0 +1,16 @@
+import { Exact } from "@smithy/types";
+
+import type { MergeFunctions } from "./function";
+
+{
+  const function1 = ({ a }: { a: boolean }) => ({ a: a });
+  const function2 = ({ b }: { b: boolean }) => ({ b: b });
+
+  const function3: MergeFunctions<typeof function1, typeof function2> = null as any;
+
+  // it should merge the first arg and return value objects of function1 and function2
+  // into function3.
+
+  type assert0 = Exact<typeof function3, ({ a, b }: { a: boolean; b: boolean }) => { a: boolean; b: boolean }>;
+  const assert0: assert0 = true as const;
+}

packages/types/src/function.ts

@@ -0,0 +1,11 @@
+/**
+ * Resolves a function that accepts both the object argument fields of F1 and F2.
+ * The function returns an intersection of what F1 and F2 return.
+ *
+ * @public
+ */
+export type MergeFunctions<F1, F2> = F1 extends (arg: infer A1) => infer R1
+  ? F2 extends (arg: infer A2) => infer R2
+    ? (arg: A1 & A2) => R1 & R2
+    : never
+  : never;

packages/types/src/index.ts

@@ -13,6 +13,7 @@ export * from "./endpoint";
 export * from "./eventStream";
 export * from "./extensions";
 export * from "./feature-ids";
+export * from "./function";
 export * from "./http";
 export * from "./identity";
 export * from "./logger";