Pass a function as a prop in Vue.js that evaluates to either true or false

I'm currently facing an issue with passing a function that returns either true or false as a prop. The function in question looks like this:

canBeUsed(): boolean {
      if (this.usable) {
        return true
      } 
     return false
     }

The component receiving the props has the following code snippet:

props: {
canBeUsed: {
type: Boolean
}
}

Unfortunately, I keep getting a warning stating

Invalid prop: type check failed for prop "canBeUsed". Expected Boolean, got Function

This error occurs because I am passing a function that ultimately resolves to a boolean value. Despite this, the functionality works fine. However, I would like to address this warning. Any assistance on resolving this is highly appreciated. Thank you!

Answer №1

It seems like you are currently implementing the following:

<component :can-be-used="canBeUsed"></component>

While this does pass the function as a prop, it is important to note that your prop should be of boolean type, so you should pass the result of the function instead:

<component :can-be-used="canBeUsed()"></component>

If the function is complex, calling it on every template rerendering may lead to performance issues. In such cases, using a computed prop would be more efficient.

<component :can-be-used="canBeUsed"></component>
computed: {
  canBeUsed(){
     if (this.usable) {
        return true
     } 
     return false
  }
}

This way, the prop value will only be reevaluated when necessary.

Answer №2

Modify the property type to be a Function:

properties: {
  readyForUse: {
    format: Function
  }
}

Answer №3

Have you considered passing this.usable directly to the component props?

<component :can-use="usable"></component>

If all that matters for your component is whether usable is true or false, then this approach should suffice. The parent can handle the data processing to determine the value of this.usable.

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