Building my first ever Gutenberg block

Gutenberg recently upgraded JSX Runtime which is only compatible WP >= 6.6. See link https://make.wordpress.org/core/2024/06/06/jsx-in-wordpress-6-6/

If you update WordPress to 6.6-beta2 then it should work.

In the meantime they are figuring out about back compatibility. See comment – https://make.wordpress.org/core/2024/06/06/jsx-in-wordpress-6-6/#comment-46779

Or if you are not ready to upgrade to WP 6.6 yet, you can downgrade @wordpress/scripts to 27 version. This back compat havoc came in version 28.

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