[noruzzamans]

What?

See #86088

Removes null from the @return docblock tag of WP_Duotone_Gutenberg::get_all_global_style_block_names(), bringing it in line with its implementation and WordPress Core, and removes the resolved entry from the PHPStan baseline.

Why?

WP_Duotone_Gutenberg::get_all_global_style_block_names() initializes self::$global_styles_block_names as an array and always returns an array of block names keyed on the block name. It never returns null.

PHPStan reports this as return.unusedType (Method WP_Duotone_Gutenberg::get_all_global_style_block_names() never returns null so it can be removed from the return type). In WordPress Core, WP_Duotone::get_all_global_style_block_names() already documents @return string[]. This resolves 1 of the errors initially baselined in #66693.

How?

• Updated the @return tag on WP_Duotone_Gutenberg::get_all_global_style_block_names() in lib/class-wp-duotone-gutenberg.php from null|array<string, string> to array<string, string>.
• Removed the corresponding return.unusedType entry from tools/phpstan/baseline.neon.

No PHP source logic or runtime behavior is changed.

Testing Instructions

1. Run composer phpstan and confirm it passes with no unmatched ignored errors.
2. Run composer phpstan:baselines and confirm tools/phpstan/baseline.neon has no further changes.

Testing Instructions for Keyboard

Not applicable. There are no UI changes.

Screenshots or screencast

Not applicable.

Use of AI Tools

I used Claude Code to identify the affected occurrence and draft the change. I reviewed the diff and take responsibility for it.

[github-actions]

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[noruzzamans]

Closed in favor of #86103, which includes this Duotone return type fix alongside the Theme JSON fixes.