Performant, flexible and extensible forms with easy to use validation.

Goal

React Hook Form strictly typed custom hooks.

Install

$ npm install @hookform/strictly-typed

Quickstart

import { useTypedController } from '@hookform/strictly-typed';
import { useForm } from 'react-hook-form';
import { TextField, Checkbox } from '@material-ui/core';

type FormValues = {
  flat: string;
  nested: {
    object: { test: string };
    array: { test: boolean }[];
  };
};

export default function App() {
  const { control, handleSubmit } = useForm<FormValues>();
  const TypedController = useTypedController<FormValues>({ control });

  const onSubmit = handleSubmit((data) => console.log(data));

  return (
    <form onSubmit={onSubmit}>
      <TypedController
        name="flat"
        defaultValue=""
        render={(props) => <TextField {...props} />}
      />

      <TypedController
        as="textarea"
        name={['nested', 'object', 'test']}
        defaultValue=""
        rules={{ required: true }}
      />

      <TypedController
        name={['nested', 'array', 0, 'test']}
        defaultValue={false}
        render={(props) => <Checkbox {...props} />}
      />

      {/* ❌: Type '"notExists"' is not assignable to type 'DeepPath<FormValues, "notExists">'. */}
      <TypedController as="input" name="notExists" defaultValue="" />

      {/* ❌: Type 'number' is not assignable to type 'string | undefined'. */}
      <TypedController
        as="input"
        name={['nested', 'object', 0, 'notExists']}
        defaultValue=""
      />

      {/* ❌: Type 'true' is not assignable to type 'string | undefined'. */}
      <TypedController as="input" name="flat" defaultValue={true} />

      <input type="submit" />
    </form>
  );
}

Name Reference

Field Path	Field Name
foo	foo
['foo', 'bar']	foo.bar
['foo', 0]	foo[0]
['foo', '0']	foo.0
['foo', 1]	foo[1]
['foo', 0, 'bar']	foo[0].bar
['foo']	foo
['foo', 'bar']	foo.bar
['foo', 'bar', 0]	foo.bar[0]

API

• useTypedController

Name	Type	Required
control	Object

• TypedController

Name	Type	Required
name	string | [string, ...(string | number)[]]	✓
as	'input' | 'select' | 'textarea'
render	Function
defaultValue	DeepPathValue
rules	Object
onFocus	() => void

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