import CSVFileValidator from 'csv-file-validator'

CSVFileValidator(file, config)
    .then(csvData => {
        csvData.data // Array of objects from file
        csvData.inValidMessages // Array of error messages
    })
    .catch(err => {})

const config = {
    headers: []
}

function(email) {
    return isEmailValid(email)
} 

const config = {
    headers: [
        { 
            name: 'First Name',
            inputName: 'firstName',
            required: true,
            requiredError: function (headerName, rowNumber, columnNumber) {
                return `${headerName} is required in the ${rowNumber} row / ${columnNumber} column`
            }
        },
        { 
            name: 'Last Name', 
            inputName: 'lastName', 
            required: false
        },
        { 
            name: 'Email', 
            inputName: 'email', 
            unique: true, 
            uniqueError: function (headerName) {
                return `${headerName} is not unique`
            }, 
            validate: function(email) {
                return isEmailValid(email)
            }, 
            validateError: function (headerName, rowNumber, columnNumber) {
                return `${headerName} is not valid in the ${rowNumber} row / ${columnNumber} column`
            }
        },
        { 
            name: 'Roles',
            inputName: 'roles',
            isArray: true
        }
    ]
}