Stop execution of a recusive function that reads a JSON object with two nested object types

I have a JSON object built from two nested objects, both of which have a label property. My function checks that, for a given rank n, the array of QuestionModel[] or ResponseModel[] does not have equal labels.

type ResponseModel = {
    label: string;
    questions?: QuestionModel[];
};

export type QuestionModel = {
    label: string;
    responses?: ResponseModel[];
};

const duplicatedLabel = async (data: QuestionModel[] | ResponseModel[]): Promise<boolean> => {
    const labelSet = new Set<string>();
    for (let obj of data) {
        if (labelSet.has(obj.label)) {
            return true;
        } else {
            labelSet.add(obj.label);
        }

        if ("questions" in obj) return await duplicatedLabel(obj.questions!);
        if ("responses" in obj) return await duplicatedLabel(obj.responses!);
    }
    return false;
};

For example, this JSON document is poorly constructed, with two equal labels at the same level yes. The function should return true, but it doesn't.

[
    {
        "label": "your destination?",
        "responses": [
            {
                "label": "USA",
                "questions": [
                    {
                        "label": "do you have a visa?",
                        "responses": [
                            {
                                "label": "yes"
                            },
                            {
                                "label": "yes"
                            }
                        ]
                    }
                ]
            },
            {
                "label": "Canada",
                "questions": [
                    {
                        "label": "do you have a work licence?",
                        "responses": [
                            {
                            "label": "yes"
                            },
                            {
                            "label": "no"
                            }
                        ]
                    }
                ]
            }
        ]
    }
]

The function always returns false

Via Active questions tagged javascript - Stack Overflow https://ift.tt/ZwBOhfG