### Start the React Application

Source: https://github.com/bripkens/formalistic/blob/main/example/login-react/README.md

This command starts the React development server, allowing you to view the login form in your browser. It typically watches for file changes and automatically reloads the application.

```bash
npm start
```

--------------------------------

### Install formalistic

Source: https://github.com/bripkens/formalistic/blob/main/README.md

Installs the formalistic library using npm. This is the primary method for adding formalistic to your project.

```bash
npm install --save formalistic
```

--------------------------------

### Create a Simple Login Form

Source: https://github.com/bripkens/formalistic/blob/main/README.md

Demonstrates how to create a basic login form using formalistic's `createField`, `createMapForm`, and `notBlankValidator`. It shows defining fields with custom validators and assembling them into a form structure.

```javascript
import {createField, createMapForm, notBlankValidator} from 'formalistic';

const emailField = createField({
  value: '',
  validator(value) {
    if (isEmail(value)) {
      return null;
    }

    return [{
      severity: 'error',
      message: 'Please provide a valid email address.'
    }];
  }
});

const passwordField = createField({
  value: '',
  validator: notBlankValidator
});

const form = createMapForm()
    .put('email', emailField)
    .put('password', passwordField)
```

--------------------------------

### formalistic API Documentation

Source: https://github.com/bripkens/formalistic/blob/main/README.md

Provides an overview of the formalistic API, including core functions for creating fields, forms, and managing form state. This documentation is derived from the formalistic.d.ts file.

```APIDOC
createField(config: FieldConfig): Field
  Creates a new form field.
  config: Configuration object for the field.
    value: The initial value of the field.
    validator: A function to validate the field's value.
    dirty?: boolean: Indicates if the field is dirty.
    pristine?: boolean: Indicates if the field is pristine.

createMapForm(): MapForm
  Creates a new form represented as a map.

notBlankValidator(value: any): ValidationError[] | null
  A built-in validator that checks if a value is not blank.

Field.setValue(value: any): Field
  Sets a new value for the field and returns a new Field instance.

Form.updateIn(path: (string | number)[], updater: (value: any) => any): Form
  Updates a value at a specific path within the form immutably.
  path: An array of keys/indices representing the path to the value.
  updater: A function that takes the current value and returns the new value.
```

--------------------------------

### Update Form Field Value

Source: https://github.com/bripkens/formalistic/blob/main/README.md

Illustrates how to update a field's value within an immutable form structure. This operation returns a new form instance with the updated field.

```javascript
const updatedForm = form.updateIn(['email'], field =>
  field.setValue('tom.mason@example.com')
);
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.