WordPress の管理画面で React が圧縮されるとデバッグがしづらいので、圧縮前のヤツを読み込むようにするプラグイン。

Unminify.php

<?php
/**
 * Plugin Name: Unminify vendor scripts.
 */

if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
	add_action( 'admin_print_scripts', function () {
		global $wp_scripts;
		unminify_execute( [
			'react',
			'react-dom',
		], $wp_scripts );
	} );
}

/**
 * @param string[] $targets
 * @param WP_Dependencies $dependencies
 */
function unminify_execute( array $targets, WP_Dependencies $dependencies ) {

	foreach ( $targets as $target ) {
		if ( ! empty( $dependencies->registered[ $target ] ) ) {
			unminify_replace_src( $dependencies->registered[ $target ] );
		}
	}
}

/**
 * @param _WP_Dependency $dependency
 */
function unminify_replace_src( _WP_Dependency $dependency ) {
	if ( ! empty( $dependency->src ) && is_string( $dependency->src ) ) {
		$dependency->src = str_replace( '.min', '', $dependency->src );
	}
}