chore(config-resolver): update RegionHash and PartitionHash

packages/config-resolver/src/regionInfo/EndpointVariant.ts

@@ -0,0 +1,9 @@
+import { EndpointVariantTag } from "./EndpointVariantTag";
+
+/**
+ * Provides hostname information for specific host label.
+ */
+export type EndpointVariant = {
+  hostname: string;
+  tags: EndpointVariantTag[];
+};

packages/config-resolver/src/regionInfo/EndpointVariantTag.ts

@@ -0,0 +1,5 @@
+/**
+ * The tag which mentions which area variant is providing information for.
+ * Can be either "fips" or "dualstack".
+ */
+export type EndpointVariantTag = "fips" | "dualstack";

packages/config-resolver/src/regionInfo/PartitionHash.ts

@@ -1,8 +1,17 @@
+import { EndpointVariant } from "./EndpointVariant";
+
 /**
  * The hash of partition with the information specific to that partition.
  * The information includes the list of regions belonging to that partition,
  * and the hostname to be used for the partition.
  */
 export type PartitionHash = {
-  [key: string]: { regions: string[]; regionRegex: string; hostname?: string; endpoint?: string };
+  [key: string]: {
+    regions: string[];
+    regionRegex: string;
+    // TODO: Remove hostname after fully switching to variants.
+    hostname: string;
+    variants: EndpointVariant[];
+    endpoint?: string;
+  };
 };

packages/config-resolver/src/regionInfo/RegionHash.ts

@@ -1,7 +1,15 @@
-import { RegionInfo } from "@aws-sdk/types";
+import { EndpointVariant } from "./EndpointVariant";
 
 /**
  * The hash of region with the information specific to that region.
  * The information can include hostname, signingService and signingRegion.
  */
-export type RegionHash = { [key: string]: Partial<Omit<RegionInfo, "partition" | "path">> };
+export type RegionHash = {
+  [key: string]: {
+    // TODO: Remove hostname after fully switching to variants.
+    hostname: string;
+    variants: EndpointVariant[];
+    signingService?: string;
+    signingRegion?: string;
+  };
+};

packages/config-resolver/src/regionInfo/getRegionInfo.spec.ts

@@ -29,11 +29,13 @@ describe(getRegionInfo.name, () => {
     ...((regionCase === RegionCase.REGION || regionCase === RegionCase.REGION_AND_ENDPOINT) && {
       [mockRegion]: {
         hostname: mockHostname,
+        variants: [{ hostname: mockHostname, tags: [] }],
       },
     }),
     ...((regionCase === RegionCase.ENDPOINT || regionCase === RegionCase.REGION_AND_ENDPOINT) && {
       [mockEndpointRegion]: {
         hostname: mockEndpointHostname,
+        variants: [{ hostname: mockEndpointHostname, tags: [] }],
       },
     }),
   });
@@ -42,9 +44,8 @@ describe(getRegionInfo.name, () => {
     [mockPartition]: {
       regions: [mockRegion, `${mockRegion}2`, `${mockRegion}3`],
       regionRegex: mockRegionRegex,
-      ...((regionCase === RegionCase.REGION || regionCase === RegionCase.REGION_AND_ENDPOINT) && {
-        hostname: mockHostname,
-      }),
+      hostname: mockHostname,
+      variants: [{ hostname: mockHostname, tags: [] }],
       ...((regionCase === RegionCase.ENDPOINT || regionCase === RegionCase.REGION_AND_ENDPOINT) && {
         endpoint: mockEndpointRegion,
       }),

packages/config-resolver/src/regionInfo/getResolvedPartition.spec.ts

@@ -13,6 +13,7 @@ describe(getResolvedPartition.name, () => {
         regions: [mockRegion, `${mockRegion}2`, `${mockRegion}3`],
         regionRegex: mockRegionRegex,
         hostname: mockHostname,
+        variants: [{ hostname: mockHostname, tags: [] }],
       },
     };
     expect(getResolvedPartition(mockRegion, { partitionHash: mockPartitionHash })).toBe(mockPartition);
@@ -24,6 +25,7 @@ describe(getResolvedPartition.name, () => {
         regions: [`${mockRegion}2`, `${mockRegion}3`],
         regionRegex: mockRegionRegex,
         hostname: mockHostname,
+        variants: [{ hostname: mockHostname, tags: [] }],
       },
     };
     expect(getResolvedPartition(mockRegion, { partitionHash: mockPartitionHash })).toBe("aws");