fix: typescript docs not being put in a docs directory (#22124)

* fix: typescript docs not being put in a docs directory

* fix: platform agnostic path separator

Author: robertmarsal

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

@@ -100,6 +100,8 @@ public class TypeScriptClientCodegen extends AbstractTypeScriptClientCodegen imp
     private final DateTimeFormatter iso8601Date = DateTimeFormatter.ISO_DATE;
     private final DateTimeFormatter iso8601DateTime = DateTimeFormatter.ISO_DATE_TIME;
 
+    protected String apiDocPath = "docs/";
+
     public TypeScriptClientCodegen() {
         super();
 
@@ -400,6 +402,11 @@ public ModelsMap postProcessModels(ModelsMap objs) {
         return objs;
     }
 
+    @Override
+    public String apiDocFileFolder() {
+        return (outputFolder + "/" + apiDocPath).replace('/', File.separatorChar);
+    }
+
     private List<Map<String, String>> toTsImports(CodegenModel cm, Set<String> imports) {
         List<Map<String, String>> tsImports = new ArrayList<>();
         for (String im : imports) {
@@ -432,6 +439,8 @@ public void processOpts() {
         apiPackage = this.apiPackage + ".apis";
         testPackage = this.testPackage + ".tests";
 
+        additionalProperties.put("apiDocPath", apiDocPath);
+
         additionalProperties.putIfAbsent(FRAMEWORK_SWITCH, FRAMEWORKS[0]);
         supportingFiles.add(new SupportingFile("index.mustache", "index.ts"));