[BUG] [typescript-fetch] Compile error when using "noImplicitOverride" in tsconfig and ES2022 #14515

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

This is similar to issue #12948 but only happens when you use ES2022 as the target because there cause?: unknown has been added to Error in lib.es2022.error.d.ts

openapi-generator version

6.2.0

OpenAPI declaration file content or url

N/A

Generation Details

N/A

Steps to reproduce

• clone https://github.com/OpenAPITools/openapi-generator/tree/master/samples/client/petstore/typescript-fetch/builds/es6-target
• Modify tsconfig.json

diff --git a/samples/client/petstore/typescript-fetch/builds/es6-target/tsconfig.json b/samples/client/petstore/typescript-fetch/builds/es6-target/tsconfig.json
index 250280d9ab0..ec9f49f3844 100644
--- a/samples/client/petstore/typescript-fetch/builds/es6-target/tsconfig.json
+++ b/samples/client/petstore/typescript-fetch/builds/es6-target/tsconfig.json
@@ -5,6 +5,11 @@
     "module": "commonjs",
     "moduleResolution": "node",
     "outDir": "dist",
+    "noImplicitOverride": true,
+    "lib": [
+      "es2022",
+      "dom"
+    ],
     "typeRoots": [
       "node_modules/@types"
     ]

• See the build fail with

src/runtime.ts:245:17 - error TS4115: This parameter property must have an 'override' modifier because it overrides a member in base class 'Error'.

245     constructor(public cause: Error, msg?: string) {
                    ~~~~~~~~~~~~~~~~~~~


Found 1 error in src/runtime.ts:245

Related issues/PRs

Suggest a fix

As this problem only occurs with ES2022 I guess one would have to introduce a special switch to know what ES-Version the generated code needs to compile with.