Automatically decode HTML entities from wp-graphql content fields

HTMLEntities.php

<?php

/**
 * WordPress does automatic HTML entity encoding but so does React which
 * results in double encoding. This reverts the one from WordPress when
 * the content is requested using wp-graphql making your life as a React
 * dev easier.
 *
 */
class HTMLEntities
{
    public function init()
    {
        //  Requires this to be merged https://github.com/wp-graphql/wp-graphql-acf/pull/74
        add_filter(
            'graphql_acf_field_value',
            [$this, 'decode_acf_entities'],
            10,
            2
        );
        add_filter(
            'graphql_resolve_field',
            [$this, 'decode_entities'],
            10,
            8
        );
    }
    /**
     * Decode HTML entities from ACF fields
     */
    function decode_acf_entities($value, $acf_field)
    {
        $text_types = ['textarea', 'text'];
        if (in_array($acf_field['type'], $text_types)) {
            return html_entity_decode($value);
        }
        if ('link' === $acf_field['type'] && !empty($value)) {
            $value['title'] = html_entity_decode($value['title']);
        }
        return $value;
    }
    /**
     * Decode HTML entities from other applicable fields.
     *
     * XXX This is not complete.
     */
    function decode_entities(
        $result,
        $source,
        $args,
        $context,
        $info,
        $type_name,
        $field_key
    ) {
        if (!\is_string($result) || !$result) {
            return $result;
        }
        $decode = false;
        if ($source instanceof \WPGraphQL\Model\Post) {
            if ('title' === $field_key) {
                $decode = true;
            }
        }
        if ($source instanceof \WPGraphQL\Model\MenuItem) {
            if ('title' === $field_key) {
                $decode = true;
            }
            if ('label' === $field_key) {
                $decode = true;
            }
        }
        if ($decode) {
            return \html_entity_decode($result);
        }
        return $result;
    }
}

Usage in functions.php:

require_once __DIR__ . '/HTMLEntities.php';

(new HTMLEntities())->init();

Thank you for this

This not needed anymore since it's part of the wp graphql core

https://www.wpgraphql.com/filters/graphql_html_entity_decoding_enabled/