Unminified react and react-dom

[emilushi]

Even if you define SCRIPT_DEBUG to true React and React-Dom are loaded minified and based on my inspection that is caused $dev_suffix on line 79 of wp-includes/script-loader.php.

The wp_scripts_get_suffix() will always return .min if passed arguments is equal to dev. As seen on line 757 of wp-includes/script-loader.php the wp_scripts_get_suffix() is setting $develop_src to false if $wp_version doesn't contain string -src for which I don't know why $wp_version will have to contain that string.

I wanted to fix it but I din't understand this part: $develop_src = false !== strpos( $wp_version, '-src' ), why $develop_src is depended on $wp_version.

Personally I think it should be depended on SCRIPT_DEBUG constant.

[afercia]

@emilushi that line of code is meant for the development trunk version, where the version is always identified with a -src suffix. For example:

$wp_version = '5.1-alpha-43677-src'

Instead, stable versions have just the version number:

$wp_version = '4.9.8';

This is intentional so that the trunk version always uses the non minified files.

[emilushi]

Thanks for the information.
I now understand it clear, then it means is needed to add another condition for cases when using stable release with SCRIPT_DEBUG to true

Replying to afercia:

@emilushi that line of code is meant for the development trunk version, where the version is always identified with a -src suffix. For example:

$wp_version = '5.1-alpha-43677-src'

Instead, stable versions have just the version number:

$wp_version = '4.9.8';

This is intentional so that the trunk version always uses the non minified files.

[earnjam]

So it's not clear to me what the determination is between when to use $suffix vs $dev_suffix on any given script, however in 45535.diff​ I simply switched to following the normal use of $suffix, which allows it to check SCRIPT_DEBUG value first and then falls back to checking for -src in the WP version.

This is particularly helpful when developing with React, which otherwise shows minified errors and requires you to click to visit reactjs.org for the full error messages.

I'm not sure why we don't just honor SCRIPT_DEBUG and then fall back to -src for all scripts. It appears this change was first introduced in [27170], but I couldn't find any discussion around why and it seems scripts included in core are split between the two suffix options to follow.

[sanchothefat]

I ran into this today as well. We should absolutely respect SCRIPT_DEBUG with this otherwise the developer experience of creating new blocks for the editor is horrible.

I've worked around it for now with this mu-plugin ​https://gist.github.com/roborourke/887ccc6a8070cb7dbd69b897bee6af7f

Would love to see this resolved in core!

[anonymized_8769252]

This should be fixed because:

1. Core breaks with a convention established by the Gutenberg plugin, see ​lib/client-assets.php.
2. Whether a script is minified or not doesn't change its functionality. But React has a production version and a development version, which differ a lot. And the production version does not have any debugging helpers in it, which makes block development in Core impossible.

[ocean90]

In 44391:

Script Loader: Load unminified package vendor scripts when SCRIPT_DEBUG is set.

The unminified package vendor scripts are bundled with the release package thus the value of the SCRIPT_DEBUG constant should be honored.

Props earnjam.
See #45535.

[ocean90]

In 44393:

Script Loader: Load unminified package vendor scripts when SCRIPT_DEBUG is set.

The unminified package vendor scripts are bundled with the release package thus the value of the SCRIPT_DEBUG constant should be honored.

Merge of [44391] to the 5.0 branch.

Props earnjam.
Fixes #45535.