chore(codegen): use Record type instead of Object

Author: trivikr

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AwsProtocolUtils.java

@@ -164,7 +164,7 @@ static void generateBuildFormUrlencodedString(GenerationContext context) {
 
         // Write a single function to handle combining a map in to a valid query string.
         writer.addImport("extendedEncodeURIComponent", "__extendedEncodeURIComponent", "@aws-sdk/smithy-client");
-        writer.openBlock("const buildFormUrlencodedString = (formEntries: { [key: string]: string }): "
+        writer.openBlock("const buildFormUrlencodedString = (formEntries: Record<string, string>): "
                 + "string => Object.entries(formEntries).map(", ").join(\"&\");",
                 () -> writer.write("([key, value]) => __extendedEncodeURIComponent(key) + '=' + "
                     + "__extendedEncodeURIComponent(value)"));

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/DocumentClientCommandGenerator.java

@@ -347,7 +347,7 @@ private void writeMemberOmitType(MemberShape member) {
             }
         } else if (memberTarget.isMapShape()) {
             MemberShape mapMember = ((MapShape) memberTarget).getValue();
-            writer.openBlock("{ [key: string]: ", "}", () -> {
+            writer.openBlock("Record<string, ", ">", () -> {
                 writeMemberOmitType(mapMember);
             });
         } else if (memberTarget instanceof CollectionShape) {

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonShapeSerVisitor.java

@@ -107,7 +107,7 @@ public void serializeMap(GenerationContext context, MapShape shape) {
 
         // Get the right serialization for each entry in the map. Undefined
         // inputs won't have this serializer invoked.
-        writer.openBlock("return Object.entries(input).reduce((acc: {[key: string]: any}, "
+        writer.openBlock("return Object.entries(input).reduce((acc: Record<string, any>, "
                 + "[key, value]: [$1T, any]) => {", "}, {});", symbolProvider.toSymbol(shape.getKey()),
             () -> {
                 writer.openBlock("if (value === null) {", "}", () -> {