@yobta/validator/lib/form/form.js

Tree-shakable es6 validator

import { fromEntries } from '../_internal/fromEntries/index.js';
import { rule } from '../rule/rule.js';
export const formMessage = 'It should be HTMLFormElement or a form Event';
export const form = (message = formMessage) => rule((value, ctx) => {
    if (value && value.target) {
        const { target } = value;
        const formNode = target.closest('form');
        if (formNode) {
            ctx.form = formNode;
        }
        // NOTE: instanceof would not work for custom elements here:
        if (formNode && target !== formNode) {
            ctx.input = target;
        }
    }
    if (value instanceof HTMLFormElement) {
        ctx.form = value;
    }
    if (ctx.form) {
        // eslint-disable-next-line n/no-unsupported-features/node-builtins
        const output = new FormData(ctx.form);
        return fromEntries(output);
    }
    throw new Error(message);
});