fix(typescript-axios): warn when useErasableSyntax and stringEnums are both enabled

TypeScript enum declarations are not erasable syntax and will fail
with erasableSyntaxOnly. Log a warning guiding users to disable
stringEnums (the default generates erasable-compatible const objects).

Author: thobed

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptAxiosClientCodegen.java

@@ -22,6 +22,8 @@
 import lombok.Getter;
 import lombok.Setter;
 import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.meta.features.DocumentationFeature;
 import org.openapitools.codegen.meta.features.SecurityFeature;
@@ -39,6 +41,8 @@
 
 public class TypeScriptAxiosClientCodegen extends AbstractTypeScriptClientCodegen {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(TypeScriptAxiosClientCodegen.class);
+
     public static final String NPM_REPOSITORY = "npmRepository";
     public static final String WITH_INTERFACES = "withInterfaces";
     public static final String SEPARATE_MODELS_AND_API = "withSeparateModelsAndApi";
@@ -186,6 +190,13 @@ public void processOpts() {
             additionalProperties.put(USE_ERASABLE_SYNTAX, this.useErasableSyntax);
         }
 
+        if (this.useErasableSyntax && this.stringEnums) {
+            LOGGER.warn("useErasableSyntax and stringEnums are both enabled. "
+                    + "TypeScript 'enum' declarations are not erasable syntax and will fail with "
+                    + "erasableSyntaxOnly. Consider disabling stringEnums (the default generates "
+                    + "erasable-compatible const objects instead).");
+        }
+
         if (additionalProperties.containsKey(NPM_NAME)) {
             addNpmPackageGeneration();
         }