const transformFields = (fields)=>{
    // If  it's a string, and it doesn't contain documentId, should be an array
    if (typeof fields === 'string') {
        // '*' => '*'
        if (fields === '*') {
            return fields;
        }
        // '' => 'documentId'
        if (fields === '') {
            return 'documentId';
        }
        // 'name,description' => 'name,description,documentId'
        if (!fields.split(',').includes('documentId')) {
            return `${fields},documentId`;
        }
    }
    // It's not an array, ignore it
    if (!fields || !Array.isArray(fields)) {
        // If fields is empty, return it as is
        return fields;
    }
    // Ensure we are always selecting the documentId
    // ['name', 'description'] => ['name', 'description', 'documentId']
    if (!fields.includes('documentId')) {
        fields.push('documentId');
    }
    return fields;
};

export { transformFields };
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