fix: fetch template to correctly generate interfaces with useAbortSignal=true

src/NSwag.CodeGeneration.TypeScript.Tests/FetchTests.cs

@@ -232,5 +232,34 @@ public async Task When_no_includeHttpContext()
             Assert.DoesNotContain("httpContext?: HttpContext", code);
             Assert.DoesNotContain("context: httpContext", code);
         }
+
+        [Fact]
+        public async Task When_abort_signal_and_generate_client_interfaces()
+        {
+            // Arrange
+            var generator = new WebApiOpenApiDocumentGenerator(new WebApiOpenApiDocumentGeneratorSettings
+            {
+                SchemaSettings = new NewtonsoftJsonSchemaGeneratorSettings { SchemaType = SchemaType.Swagger2 }
+            });
+
+            var document = await generator.GenerateForControllerAsync<DiscussionController>();
+            var json = document.ToJson();
+
+            // Act
+            var codeGen = new TypeScriptClientGenerator(document, new TypeScriptClientGeneratorSettings
+            {
+                Template = TypeScriptTemplate.Fetch,
+                UseAbortSignal = true,
+                GenerateClientInterfaces = true,
+                TypeScriptGeneratorSettings =
+                {
+                    TypeScriptVersion = 2.7m
+                }
+            });
+            var code = codeGen.GenerateFile();
+
+            // Assert
+            Assert.Contains("signal?: AbortSignal): Promise<void>;", code);
+        }
     }
 }

src/NSwag.CodeGeneration.TypeScript/Templates/FetchClient.liquid

@@ -4,7 +4,7 @@
 {%    for operation in Operations %}
 
     {% template Client.Method.Documentation %}
-    {{ operation.MethodAccessModifier }}{{ operation.ActualOperationName }}({% for parameter in operation.Parameters %}{{ parameter.VariableName }}{% if GenerateOptionalParameters and parameter.IsOptional %}?{% endif %}: {{ parameter.Type }}{{ parameter.TypePostfix }}{% if parameter.IsLast == false %}, {% endif %}{% endfor %}): Promise<{{ operation.ResultType }}>;
+    {{ operation.MethodAccessModifier }}{{ operation.ActualOperationName }}({% for parameter in operation.Parameters %}{{ parameter.VariableName }}{% if GenerateOptionalParameters and parameter.IsOptional %}?{% endif %}: {{ parameter.Type }}{{ parameter.TypePostfix }}{% if parameter.IsLast == false %}, {% endif %}{% endfor %}{% if UseAbortSignal %}{% if operation.Parameters.size > 0 %}, {% endif %}signal?: AbortSignal{% endif %}): Promise<{{ operation.ResultType }}>;
 {%-    endfor %}}
 {%- endif -%}