code: async function exportCustomSelectorsToCssFile(to, customSelectors) {
  	const cssContent = Object.keys(customSelectors).reduce((cssLines, name) => {
  		cssLines.push(`@custom-selector ${name} ${customSelectors[name]};`);
  
  		return cssLines;
  	}, []).join('\n');
  	const css = `${cssContent}\n`;
  
  	await writeFile(to, css);
  }
docs: /* Import Custom Selectors from CSS File
  /* ==========================================================================