3.19 - Preload Fonts - Filter to add extensions

[piotrbak]

User Story

As an admin, I want to apply preload fonts to other font file type using filter

Acceptance Criteria

• Fonts are added using filter with font extension
• Filter is guarded against unexpected values

[Miraeld]

Scope a solution

⚠ This grooming is based on #7302

In

wp-rocket/inc/Engine/Media/PreloadFonts/Frontend/Controller.php

Line 66 in 66e41dc

public function add_custom_data( array $data ): array {

We can add the following:

		$processed_extensions = [
			'woff2', 
			'woff',
			'ttf',
		];
		
		/**
		 * Filters the list of processed font extensions.
		 *
		 * @param array $processed_extensions Array of processed font extensions.
		 */
		wpm_apply_filters_typed( 'array', 'rocket_preload_fonts_processed_extensions', $processed_extensions );

		$data[ 'processed_extensions' ] = $processed_extensions;

So it will be given to rocket_beacon_data JS variable so it could be picked up by the beacon script.