We don't have the decimal type between the possible types to use in the data of a vuejs component (String, Number, Boolean, Array, Object, Date, Function, Symbol), so how to define a variable of this type ?
A decimal variable is of type Number, you could define it as number then use a validator to check if it's decimal :
props:{
price:{
type:Number,
validator(value){
return value%1!==0
}
}
}