@opengis/fastify-table/dist/server/plugins/util/funcs/flattenObject.js

core-plugins

export default function flattenObject(obj, keys, parent = "") {
    return Object.keys(obj || {}).reduce((acc, key) => {
        const newKey = parent ? `${parent}.${key}` : key;
        if (typeof obj[key] === "object" &&
            obj[key] !== null &&
            !Array.isArray(obj[key])) {
            Object.assign(acc, flattenObject(obj[key], keys, newKey));
        }
        else if (keys ? keys.includes(newKey) : true) {
            acc[newKey] = obj[key];
        }
        return acc;
    }, {});
}