[BUG] Description

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• Have you validated the input using an OpenAPI validator (example)?
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Description

axios-typescript generator does not honor required properties in a derived model schema.

Start with a base schema and derive some schemas from it -- use the same property names/types,
but in derived schemas, mark some properties as required. See components/schemas/base,
components/schemas/thing2, components/schemas/thing3, in the sample OpenAPI input

In the generated api.json, the generated Typescript classes for Thing2 and Thing3 merely extend Base,

/**
 * Base type.
 * @export
 * @interface Base
 */
export interface Base {
    /**
     * A
     * @type {string}
     * @memberof Base
     */
    a?: string;
    /**
     * B
     * @type {string}
     * @memberof Base
     */
    b?: string;
    /**
     * map of string -> msg
     * @type {{ [key: string]: Msg; }}
     * @memberof Base
     */
    msgs1?: { [key: string]: Msg; };
    /**
     * messages object, a map of string -> msg
     * @type {{ [key: string]: Msg; }}
     * @memberof Base
     */
    msgs2?: { [key: string]: Msg; };
}

/**
 * Thing2
 * @export
 * @interface Thing2
 */
export interface Thing2 extends Base {
}
/**
 * Thing3
 * @export
 * @interface Thing3
 */
export interface Thing3 extends Thing1 {
}

which leaves the types of the properties a and b as still optional

Those types should change the types of a and b from a?: string; b?:string
to a: string; b:string in Thing2 and Thing3 to reflect the JSON schema.
This will allow better diagnostics in client code that uses the generated types, i.e. one can use

const thing3 : Thing3 = ....;
const t3a :string = thing3.a;
const t3b :string = thing3.b;

and allow passing t3a and t3b to other code that uses the type string without
having to deal with undefined.

openapi-generator version

4.3.0-SNAPSHOT

OpenAPI declaration file content or url

openapi.yaml (Gist)

Generation Details

openapi-generator generate -g typescript-axios -o gen/__typescript-axios -i openapi.yaml

Steps to reproduce

run the command

Related issues/PRs

Suggest a fix

Start with the linked openapi.yaml and run the shown typescript-axios generation command. Compare the generated Thing2 and Thing3 declarations with the required properties in the derived schemas. Done means inherited required properties are emitted as non-optional TypeScript properties, while unrelated optional properties remain unchanged.