feat: add support for translating @ to at_ in variable names for TypeScript clients

[ceesvanegmond]

I'm having the same issue as #12171. This PR applies the same principe, but for TypeScript clients

---

Summary by cubic

Translate leading @ in OpenAPI property names to at_ for TypeScript clients to avoid collisions and duplicate type fields (e.g., @type becomes atType/at_type). Implemented in AbstractTypeScriptClientCodegen, so it applies to all TS client generators.

• Bug Fixes
  • Map leading @ to at_ in toVarName within AbstractTypeScriptClientCodegen.
  • Respect MODEL_PROPERTY_NAMING (e.g., camelCase vs original) when forming the final name.
  • Add tests for typescript-fetch and typescript-angular confirming @id => atId/at_id.

^{Written for commit c8f02db. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractTypeScriptClientCodegen.java">

<violation number="1" location="modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractTypeScriptClientCodegen.java:593">
P2: Schemas containing both `@foo` and `at_foo` now generate the same TypeScript member name (`atFoo`), so one property's value overwrites/aliases the other in clients such as typescript-fetch. Preserve uniqueness after this translation (or disambiguate colliding model property names) rather than relying on a fixed `at_` prefix.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

P2: Schemas containing both @foo and at_foo now generate the same TypeScript member name (atFoo), so one property's value overwrites/aliases the other in clients such as typescript-fetch. Preserve uniqueness after this translation (or disambiguate colliding model property names) rather than relying on a fixed at_ prefix.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractTypeScriptClientCodegen.java, line 593:

<comment>Schemas containing both `@foo` and `at_foo` now generate the same TypeScript member name (`atFoo`), so one property's value overwrites/aliases the other in clients such as typescript-fetch. Preserve uniqueness after this translation (or disambiguate colliding model property names) rather than relying on a fixed `at_` prefix.</comment>

<file context>
@@ -588,6 +588,10 @@ public String toVarName(String name) {
 
+        // translate @ for properties (like @type) to at_.
+        // Otherwise an additional "type" property will leed to duplcates
+        name = name.replaceAll("^@", "at_");
+
         name = sanitizeName(name, "[^\\w$]");
</file context>

[wing328]

thanks for the PR

cc @TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @topce (2018/10) @akehir (2019/07) @petejohansonxo (2019/11) @amakhrov (2020/02) @davidgamero (2022/03) @mkusaka (2022/04) @joscha (2024/10) @KannaKim (2026/07)