How to access FieldError object by index

[tylerbunting]

Hi there, firstly I have never made a discussion on GitHub before so apologies if I use any incorrect terminology.

So I am creating a form to create a template. These templates can have multiple cards so all components are stored in a field called cardComponents which utilizes useFieldArray. Within these cards there is an optional field for buttons which is also using useFieldArray. The input fields for these buttons are stored in a different react component. I pass this component the errors like so:

<CreateTemplateButtonFields cardIndex={cardIndex} control={componentsControl} register={componentsRegister} sources={sources} errors={componentsErrors.cardComponents?.[cardIndex]?.buttons} buttonConfig={buttonField} />

The value being passed to the errors prop has type: FieldError | undefined so I pass the props like this:

interface CreateTemplateButtonFieldsProps { cardIndex: number; control: Control<ComponentsFormValues>; register: UseFormRegister<ComponentsFormValues>; sources: MessageSource[]; buttonConfig?: CreateTemplateComponent; errors?: FieldError; }

I am trying to access the values of these errors within the components like so:

<TextField fullWidth label="Title" error={Boolean(props.errors?.[index]?.title)} helperText={props.errors?.[index]?.title.message} {...props.register(cardComponents.${props.cardIndex}.buttons.${index}.title as const)} />

However, I am getting the following error underneath props.errors?.[index]:

Element implicitly has an 'any' type because expression of type 'number' can't be used to index type 'FieldError'.
No index signature with a parameter of type 'number' was found on type 'FieldError'.

When I breakpoint the props.errors or console.log it, the value printed is an array.

How do I access these values by index?

My button fields include: title, type and payload which should all be strings.

Thank you for the help.

[tatsmaki]

Would be nice to have code-sandbox to reproduce your case.

[tylerbunting]

Give me 5 minutes ill get one linked in here.

[tylerbunting]

Closing as realised error was to do with field type being either string | object.