default when optional params and fix types

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

@@ -157,11 +157,11 @@ export class {{classname}}RequestFactory extends BaseAPIRequestFactory {
         {{/bodyParam}}
 
         {{#hasAuthMethods}}
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         {{/hasAuthMethods}}
         {{#authMethods}}
         // Apply auth methods
-        authMethod = defaultSecurityAuthentication || _config.authMethods["{{name}}"]
+        authMethod = this.defaultSecurityAuthentication || _config.authMethods["{{name}}"]
         if (authMethod) {
             await authMethod.applySecurityAuthentication(requestContext);
         }

modules/openapi-generator/src/main/resources/typescript/services/ObjectParamAPI.mustache

@@ -26,7 +26,7 @@ export abstract class AbstractObject{{classname}} {
      {{/summary}}
      * @param param the request object
      */
-    public abstract {{nickname}}(param: req.{{classname}}{{operationIdCamelCase}}Request, options?: Configuration): {{#useRxJS}}Observable{{/useRxJS}}{{^useRxJS}}Promise{{/useRxJS}}<{{{returnType}}}{{^returnType}}void{{/returnType}}>;
+    public abstract {{nickname}}(param: req.{{classname}}{{operationIdCamelCase}}Request {{^hasRequiredParams}} = {}{{/hasRequiredParams}}, options?: Configuration): {{#useRxJS}}Observable{{/useRxJS}}{{^useRxJS}}Promise{{/useRxJS}}<{{{returnType}}}{{^returnType}}void{{/returnType}}>;
 
     {{/operation}}
 }

modules/openapi-generator/src/main/resources/typescript/types/ObjectParamAPI.mustache

@@ -47,7 +47,7 @@ export class Object{{classname}} {
      {{/summary}}
      * @param param the request object
      */
-    public {{nickname}}(param: {{classname}}{{operationIdCamelCase}}Request, options?: Configuration): {{#useRxJS}}Observable{{/useRxJS}}{{^useRxJS}}Promise{{/useRxJS}}<{{{returnType}}}{{^returnType}}void{{/returnType}}> {
+    public {{nickname}}(param: {{classname}}{{operationIdCamelCase}}Request {{^hasRequiredParams}}= {}{{/hasRequiredParams}}, options?: Configuration): {{#useRxJS}}Observable{{/useRxJS}}{{^useRxJS}}Promise{{/useRxJS}}<{{{returnType}}}{{^returnType}}void{{/returnType}}> {
         return this.api.{{nickname}}({{#allParams}}param.{{paramName}}, {{/allParams}} options){{^useRxJS}}.toPromise(){{/useRxJS}};
     }