@angular/forms/signals

ValidationError

interface

Common interface for all validation errors.

API

    
      interface ValidationError {}

string

Identifies the kind of error.

string | undefined

Human readable error message.

interface

Validation error with a field.

This is returned from field state, e.g., catField.errors() would be of a list of errors with field: catField bound to state.

    
      interface WithField extends ValidationError {}

interface

Validation error with optional field.

This is generally used in places where the result might have a field. e.g., as a result of a validateTree, or when handling form submission.

    
      interface WithOptionalField extends ValidationError {}

interface

Validation error with no field.

This is used to strongly enforce that fields are not allowed in validation result.

    
      interface WithoutField extends ValidationError {}

Common interface for all validation errors.

This can be returned from validators.

It's also used by the creation functions to create an instance (e.g. requiredError, minError, etc.).