import { Failure } from '../base';
import { Validator, ValidatorOptions } from './validator';
import { ValidatorBase } from './validatorBase';
/**
 * Parameters used to construct a {@link Validation.FieldValidator | FieldValidator}.
 * @public
 */
export interface FieldValidatorOptions<TC> extends ValidatorOptions<TC> {
    optional?: boolean;
}
/**
 * An in-place {@link Validation.Validator | Validator} for properties
 * an an object.
 * @public
 */
export declare class FieldValidator<T, TC = unknown> extends ValidatorBase<T, TC> {
    /**
     * The name of the property that this validator should validate.
     */
    readonly fieldName: string;
    /**
     * The {@link Validation.Validator | Validator} to be applied against the named property.
     */
    readonly fieldValidator: Validator<T, TC>;
    /**
     * @internal
     */
    protected readonly _fieldOptions: FieldValidatorOptions<TC>;
    /**
     * Constructs a new {@link Validation.FieldValidator | FieldValidator.}.
     * @param fieldName - The name of the property that this validator should validate.
     * @param fieldValidator - The {@link Validation.Validator | Validator} to be applied
     * against the named property.
     * @param options - Additional {@link Validation.FieldValidatorOptions | options} to be
     * applied to this validation.
     */
    constructor(fieldName: string, fieldValidator: Validator<T, TC>, options?: FieldValidatorOptions<TC>);
    /**
     * {@inheritdoc Validation.ValidatorBase._validate}
     */
    protected _validate(from: unknown, context?: TC, self?: Validator<T, TC>): boolean | Failure<T>;
}
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