title: Override OpenAPI Generator BasePath on Generation
body: <p>I am creating a TypeScript Axios REST API client with <a href="https://openapi-generator.tech/" rel="noreferrer">OpenAPI Generator</a>. I'm doing this in my terminal using <code>npx @openapitools/openapi-generator-cli generate -i ../swagger.json -g typescript-axios -o ./rest/</code>.</p>
  <p>Since my host is depending on my .env variables, I want to read my API_URL from my env variables and pass it to the generating process of the generator.</p>
  <p>I found <a href="https://openapi-generator.tech/docs/generators/typescript-axios#client-modification-feature" rel="noreferrer">in the docs</a> that changing the BasePath is in some way possible, but I can't figure out the way to do it. Adding <code>--basePath=1.2.3.4:8080</code> does not work, and I don't understand what &quot;Defined by ToolingExtension&quot; means.</p>