boonya/react-hook-form-validation

import { DEFAULT_FIELD_STATE, FormValidity, FieldState } from './types';

export default class Validity implements FormValidity {
    constructor(private validity: FieldState[]) { }

    private getFieldValidity(field: string, index = 0) {
        const result = this.validity.find((i) => i.name === field && i.index === index);
        if (result) {
            return result;
        }
        return { ...DEFAULT_FIELD_STATE, name: field };
    }

    values(): FieldState[] {
        return this.validity;
    }

    isError(field?: string, index?: number): boolean {
        if (field) {
            const { error } = this.getFieldValidity(field, index);
            return error === true;
        }
        return this.validity.length > 0 && this.validity.some(({ error }) => error === true);
    }

    isValid(field?: string, index?: number): boolean {
        return !this.isError(field, index);
    }

    isPristine(field?: string, index?: number): boolean {
        if (field) {
            const { pristine } = this.getFieldValidity(field, index);
            return pristine === true;
        }
        return this.validity.every(({ pristine }) => pristine === true);
    }

    isDirty(field?: string, index?: number): boolean {
        return !this.isPristine(field, index);
    }

    getMessage(field: string, index?: number): string | undefined {
        const { message } = this.getFieldValidity(field, index);
        return message;

    }

    getFormMessages(): string[] {
        return this.validity.map(({ message }) => message).filter((v) => v) as [];
    }
}