chore: use union type on LoadedConfigSelectors

Author: trivikr

packages/middleware-flexible-checksums/src/NODE_REQUEST_CHECKSUM_CALCULATION_CONFIG_OPTIONS.ts

@@ -6,10 +6,12 @@ import { SelectorType, stringUnionSelector } from "./stringUnionSelector";
 export const ENV_REQUEST_CHECKSUM_CALCULATION = "AWS_REQUEST_CHECKSUM_CALCULATION";
 export const CONFIG_REQUEST_CHECKSUM_CALCULATION = "request_checksum_calculation";
 
-export const NODE_REQUEST_CHECKSUM_CALCULATION_CONFIG_OPTIONS: LoadedConfigSelectors<string> = {
+export const NODE_REQUEST_CHECKSUM_CALCULATION_CONFIG_OPTIONS: LoadedConfigSelectors<RequestChecksumCalculation> = {
   environmentVariableSelector: (env) =>
+    // @ts-expect-error Type 'string | undefined' is not assignable to type 'RequestChecksumCalculation | undefined'.
     stringUnionSelector(env, ENV_REQUEST_CHECKSUM_CALCULATION, RequestChecksumCalculation, SelectorType.ENV),
   configFileSelector: (profile) =>
+    // @ts-expect-error Type 'string | undefined' is not assignable to type 'RequestChecksumCalculation | undefined'.
     stringUnionSelector(profile, CONFIG_REQUEST_CHECKSUM_CALCULATION, RequestChecksumCalculation, SelectorType.CONFIG),
   default: DEFAULT_REQUEST_CHECKSUM_CALCULATION,
 };

packages/middleware-flexible-checksums/src/NODE_RESPONSE_CHECKSUM_VALIDATION_CONFIG_OPTIONS.ts

@@ -1,15 +1,17 @@
 import { LoadedConfigSelectors } from "@smithy/node-config-provider";
 
-import { DEFAULT_RESPONSE_CHECKSUM_VALIDATION, RequestChecksumCalculation } from "./constants";
+import { DEFAULT_RESPONSE_CHECKSUM_VALIDATION, ResponseChecksumValidation } from "./constants";
 import { SelectorType, stringUnionSelector } from "./stringUnionSelector";
 
 export const ENV_RESPONSE_CHECKSUM_VALIDATION = "AWS_RESPONSE_CHECKSUM_VALIDATION";
 export const CONFIG_RESPONSE_CHECKSUM_VALIDATION = "response_checksum_validation";
 
-export const NODE_RESPONSE_CHECKSUM_VALIDATION_CONFIG_OPTIONS: LoadedConfigSelectors<string> = {
+export const NODE_RESPONSE_CHECKSUM_VALIDATION_CONFIG_OPTIONS: LoadedConfigSelectors<ResponseChecksumValidation> = {
   environmentVariableSelector: (env) =>
-    stringUnionSelector(env, ENV_RESPONSE_CHECKSUM_VALIDATION, RequestChecksumCalculation, SelectorType.ENV),
+    // @ts-expect-error Type 'string | undefined' is not assignable to type 'ResponseChecksumValidation | undefined'.
+    stringUnionSelector(env, ENV_RESPONSE_CHECKSUM_VALIDATION, ResponseChecksumValidation, SelectorType.ENV),
   configFileSelector: (profile) =>
-    stringUnionSelector(profile, CONFIG_RESPONSE_CHECKSUM_VALIDATION, RequestChecksumCalculation, SelectorType.CONFIG),
+    // @ts-expect-error Type 'string | undefined' is not assignable to type 'ResponseChecksumValidation | undefined'.
+    stringUnionSelector(profile, CONFIG_RESPONSE_CHECKSUM_VALIDATION, ResponseChecksumValidation, SelectorType.CONFIG),
   default: DEFAULT_RESPONSE_CHECKSUM_VALIDATION,
 };

packages/middleware-flexible-checksums/src/stringUnionSelector.ts

@@ -15,7 +15,7 @@ export const stringUnionSelector = (
   key: string,
   union: Record<string, string>,
   type: SelectorType
-) => {
+): (typeof union)[keyof typeof union] | undefined => {
   if (!(key in obj)) return undefined;
 
   const value = obj[key]!.toUpperCase();