implicit conversion of symbol to string error in TypeScript-Aurelia template ts(2731)

Description

Generation of the typescript-aurelia code results in an error from typescript as follows.

Implicit conversion of a 'symbol' to a 'string' will fail at runtime. Consider wrapping this expression in 'String(...)'.ts(2731)

Error is in output file 'Api.ts' as shown below:

The change to typescript that picks up this problem is documented here:
https://devblogs.microsoft.com/typescript/announcing-typescript-4-7-rc/#stricter-checks-with-template-string-expressions

openapi-generator version

@openapitools/openapi-generator-cli": "^2.7.0"

OpenAPI declaration file content or url

modules/openapi-generator/src/main/resources/typescript-aurelia/Api.ts.mustache

Generation Details

Steps to reproduce

Generate an api client as documented. Does not matter the server side code as the error is in the template.

 # Update the api to a specific version 
 npx @openapitools/openapi-generator-cli generate -i 'https://localhost:44348/v4.0/swagger' -g typescript-aurelia -o './src/resources/bookings-api-client'

Suggest a fix

Solution is to do as suggested and wrap the symbol conversion in the string constructor String(..)

Start with modules/openapi-generator/src/main/resources/typescript-aurelia/Api.ts.mustache and reproduce the issue using the documented npx generation command. Inspect the generated Api.ts around the reported template expression. Done means the generated TypeScript-Aurelia client no longer produces the ts(2731) implicit symbol-to-string error.