Fixes the non-working query parameter when it's an Enum

bin/configs/typescript-echo-api.yaml

@@ -0,0 +1,9 @@
+generatorName: typescript
+outputDir: samples/client/echo_api/typescript/build
+inputSpec: modules/openapi-generator/src/test/resources/3_0/echo_api.yaml
+templateDir: modules/openapi-generator/src/main/resources/typescript
+additionalProperties:
+  artifactId: echo-api-typescript
+  hideGenerationTimestamp: "true"
+  npmVersion: 1.0.0
+  npmName: '@openapitools/typescript-echo-api'

modules/openapi-generator/src/main/resources/typescript/api/api.mustache

@@ -70,6 +70,10 @@ export class {{classname}}RequestFactory extends BaseAPIRequestFactory {
             requestContext.setQueryParam("{{baseName}}", ObjectSerializer.serialize({{paramName}}, "{{{dataType}}}", "{{dataFormat}}"));
             {{/isPrimitiveType}}
             {{^isPrimitiveType}}
+            {{#isEnumRef}}
+            requestContext.setQueryParam("{{baseName}}", ObjectSerializer.serialize({{paramName}}, "{{{dataType}}}", "{{dataFormat}}"));
+            {{/isEnumRef}}
+            {{^isEnumRef}}
             {{#isExplode}}
             const serializedParams = ObjectSerializer.serialize({{paramName}}, "{{{dataType}}}", "{{dataFormat}}");
             {{#isArray}}
@@ -86,6 +90,7 @@ export class {{classname}}RequestFactory extends BaseAPIRequestFactory {
             {{^isExplode}}
             requestContext.setQueryParam("{{baseName}}", ObjectSerializer.serialize({{paramName}}, "{{{dataType}}}", "{{dataFormat}}"));
             {{/isExplode}}
+            {{/isEnumRef}}
             {{/isPrimitiveType}}
         }
         {{/queryParams}}