src/generators/shared/utils/getIntro.js/getIntro
export default function getIntro ( format, options, imports ) {
	if ( format === 'es' ) return '';
	if ( format === 'amd' ) return getAmdIntro( options, imports );
	if ( format === 'cjs' ) return getCjsIntro( options, imports );
	if ( format === 'iife' ) return getIifeIntro( options, imports );
	if ( format === 'umd' ) return getUmdIntro( options, imports );
	if ( format === 'eval' ) return getEvalIntro( options, imports );

	throw new Error( `Not implemented: ${format}` );
}