[BUG][typescript-axios] Incorrect handling of property.title with unicode content in version 6.x.x

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

After updating to version 7 of generator, it can not longer generate code for enum union correctly.

I think it's based on incorrect usage of property "title" to generate type:

[main] INFO o.o.codegen.InlineModelResolver - Inline schema created as ______. To have complete control of the model name, set the title field or use the inlineSchemaNameMapping option (--inline-schema-name-mappings in CLI).

We have property with "title" set to unicode value (becouse it's supposed to be human-readable property name. We're using drf-spectacular to generate api schema from django-rest-framework, and it put field verbose name there.).

From version 6 openapi-generator tries to use it for generation of enum names, which leads to this error.

Diff of the generated code inv v5.x vs v6.x looks like this:

--- a/src/model/personal-info-account.ts
+++ b/src/model/personal-info-account.ts
@@ -13,8 +13,6 @@
  */


-import { BlankEnum } from './blank-enum';
-import { CountryEnum } from './country-enum';

 /**
  *
@@ -24,9 +22,9 @@ import { CountryEnum } from './country-enum';
 export interface PersonalInfoAccount {
     /**
      *
-     * @type {CountryEnum | BlankEnum}
+     * @type {}
      * @memberof PersonalInfoAccount
      */
-    'country'?: CountryEnum | BlankEnum;
+    'country'?: ;
 }

And it generated one additional file with empty name:

// cat src/model/.ts
// ...
// May contain unused imports in some cases
// @ts-ignore
import { BlankEnum } from './blank-enum';
// May contain unused imports in some cases
// @ts-ignore
import { CountryEnum } from './country-enum';

/**
 * @type
 * @export
 */
export type  = BlankEnum | CountryEnum;

openapi-generator version

6.5.0 (any 6.x.x)

This issue was not present in 5.4.0.

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  description: API Client
  title: App
  version: 1.0.0
paths:
  /account/personal_info/:
    get:
      operationId: account_personal_info_retrieve
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PersonalInfoAccount'
          description: ''
      security:
        - cookieAuth: []
        - basicAuth: []
      tags:
        - account
components:
  schemas:
    BlankEnum:
      enum:
      - ''
    CountryEnum:
      enum:
      - UA
      - US
      type: string
    PersonalInfoAccount:
      properties:
        country:
          title: Країна
          oneOf:
          - $ref: '#/components/schemas/CountryEnum'
          - $ref: '#/components/schemas/BlankEnum'
      type: object

Generation Details

openapi-generator-cli generate -i schema.yml -g typescript-axios -o src -p apiPackage=api,modelPackage=model,withSeparateModelsAndApi=true

Steps to reproduce

1. Save schema to schema.yml
2. Run openapi-generator
3. Look at the invalid files:

• src/model/.ts
• src/model/personal-info-account.ts

Related issues/PRs

Not found.

Suggest a fix

title should not be used to generate enum name, becouse it's human-readable text and can contain unicode characters.

Start by running the provided openapi-generator-cli command with the schema.yml example and inspect the generated src/model/.ts and src/model/personal-info-account.ts files. Trace the typescript-axios generator's handling of the property title and inline enum naming, then confirm that Unicode titles no longer produce empty filenames or invalid TypeScript types.