In the source for the vue-typeahead-bootstrap component, there are props with a type and validator defined:
data: {
type: Array,
required: true,
validator: d => d instanceof Array
},
serializer: {
type: Function,
default: (d) => d,
validator: d => d instanceof Function
},
These type and validator options seem redundant, since the validator is enforcing the same data type as each respective prop's type. As far as I'm aware, Vue already checks prop types internally, which would make this unnecessary. What is the purpose of this approach? Could the custom validators simply be removed?
It is true that Vue already checks prop types internally, but the validator option allows you to specify a custom validation function for props in addition to the built-in type checking.
The validator function is called whenever the value of the prop is set, and it receives the new value as an argument. You can use this function to perform additional checks on the prop value, beyond just checking its type.
For example, in the data prop in the example you have provided, the validator function is checking that the value of the data prop is an array. This is in addition to the built-in type checking, which checks that the value of the data prop is an array as well.
The validator function can be useful if you need to perform more complex checks on prop values, or if you want to enforce additional constraints on the prop values beyond just their type.
As for whether the custom validators can simply be removed, it depends on the specific use case. If the custom validators are not necessary for your application, then you can remove them. However, if the custom validators are performing important checks or constraints on the prop values, then you should keep them.