scinote-web/app/javascript/packs/locales/utils.js

// with this utility function we can write nested locales like an json object
export function flattenMessages(nestedMessages, prefix = '') {
    return Object.keys(nestedMessages).reduce((messages, key) => {
        let value       = nestedMessages[key];
        let prefixedKey = prefix ? `${prefix}.${key}` : key;

        if (typeof value === 'string') {
            messages[prefixedKey] = value;
        } else {
            Object.assign(messages, flattenMessages(value, prefixedKey));
        }

        return messages;
    }, {});
}