$mul

Update records by multiplying the value of a numeric column by a specified factor. The $mul method is used to adjust numeric fields by multiplying the current value with a given number, often used in scenarios like applying a percentage increase or scaling values.

await Member.$update({
    $where: { 
        age: { 
            $eq: 16 
        } 
    },
    $update: {
        $mul: {
          age: 3
        }
    }
});