edmundhung/conform v0.8.0

on GitHub

import { z } from 'zod';

// Before: Use .min(1) to mark a field as required
const required = z.string().min(1, 'Field is required');

// Now: It's required by default and use .optional() to mark it as optional
const required = z.string({ required_error: 'Field is required' });
const optional = z.string().optional();

// Before: Manualy transform the value to the desired type
const numberInput = z.string().transform((val) => Number(value));
// or use preprocess
const checkbox = z.preprocess(value => value === 'on', z.boolean());;

// Now: Conform does type coercion for you
const numberInput = z.number();
// Including checkbox. (Note: boolean coercion only works with default value 'on')
const checkbox = z.boolean().optional();

// You can continue transform / preprocess yourself
// e.g. checkbox with custom value "yes"
const checkbox = z.string().transform(value => value === 'yes');

const submission = parse(formData, {
    // This option can now be removed 
    acceptMultipleErrors() {
        // ...   
    }
});

export async function action({ request }) {
    const formData = await request.formData();
    const submission = parse(formData, {
        // ...
    });


    if (submission.intent === 'submit' || !submission.value) {
        return json(submission);
    }

    if (/* some additional checks */) {
        return json({
            ...submission,
            error: {
                // Pass an array instead of a string 
                '': ['Something went wrong']
            }
        }) 
    }
}

function Example() {
  const [form, fields] = useForm({
    // You can set the default value to an array with one item if you want
    defaultValue: {
      tasks: [''],
    },
  })
  const tasks = useFieldList(fields.tasks);

  return (
    <form>
      <div>
        {tasks.map((task, index) => (
          <div key={task.key}>
            {/* ... */}
          </div>
        ))} 
      </div>
    </form>
  );
}

import { conform, useForm } from '@conform-to/react';
import { parse } from '@conform-to/zod';
import { z } from 'zod';

const schema = z.object({
  answer: z
    .string()
    .array()
    .nonEmpty('At least one answer is required'),
});

function Example() {
  const [form, { answer }] = useForm({
    onValidate({ formData }) {
      return parse(formData, { schema });
    },
  });

  return (
    <form {...form.props}>
      <fieldset>
        <lengend>Please select the correct answers</legend>
        {conform
          .collection(answer, {
            type: 'checkbox',
            options: ['a', 'b', 'c', 'd'],
          })
          .map((props, index) => (
            <div key={index}>
              <label>{props.value}</label>
              <input {...props} />
            </div>
          )))}
        <div>{answer.error}</div>
      </legend>
      <button>Submit</button>
    </form>
  );
}