How to implement OpenAPI client side generator for React-Native app? [WITHOUT TYPESCRIPT]

I am trying to implement OpenAPI Client side code generator in my react-native app where we are not using TypeScript. But all of the article which i have seen till now are are recommending to create react-native app with TypeScript template by using typescript-axios generator. Ref: How to automate API code generation (OpenAPI/Swagger) and boost productivity I want to know how can we implement the same without typescript. I have seen that Javascript is also there in OpenAPI client side generators. But i don't know how to implement that