leafo compiler set var & import paths

compile.php

<?php

// Include compiler if class isn't loaded.
if ( ! class_exists( '\Leafo\ScssPhp\Compiler' ) ) {
	require get_theme_file_path( 'vendor/scssphp/scss.inc.php' );
}

// Create compiler instance.
$scss = new Compiler();

/**
 * If your variables are in a _variables.scss file outside of the main
 * scss file, you can set the import path to ensure the right path is used
 */

// Set @import path for ../../wp-content/themes/my-theme/scss/
$importPath = trailingslashit( get_theme_file_path( 'scss' ) );
$scss->setImportPaths( $importPath );

/**
 * Add an array of variables you want to have compiled by leafo compiler.
 * This example will look for the theme_mod to be set, and if it's not, it
 * will use black as the default color. 
 *
 * It will then create and add the scss variable with the passed value, or use
 * the default color you specify, ie:
 *
 * $brand-primary: black;
 */

// Set variables to compile.
$mod = get_theme_mod( 'brandPrimary', 'black' ); // brand color theme_mod
$variables = [
	'brand-primary' => $mod,
];
$scss->setVariables( $variables );

/**
 * Run the compiler.
 * $compiled will contain the compiled CSS that you can save to a file and have enqueued.
 * If it's a customizer change for the user then you could hook into 'customize_save_after'
 * to run this on save of new settings.  Check $old !== $new to save overcompiling unchanged vars.
 */
// Run leafo compiler to compile SASS to CSS.
$content = 'body{ background-color: $brand-primary; }'
$compiled = $scss->compile( $content );

// var_dump( $compiled ); die; // => ( string ) 'body{ background-color: black; }'