src/utils/deindent.js/deindent
export default function deindent ( strings, ...values ) {
	const indentation = start.exec( strings[0] )[1];
	const pattern = new RegExp( `^${indentation}`, 'gm' );

	let result = strings[0].replace( start, '' ).replace( pattern, '' );

	let trailingIndentation = getTrailingIndentation( result );

	for ( let i = 1; i < strings.length; i += 1 ) {
		const value  = String( values[ i - 1 ] ).replace( /\n/g, `\n${trailingIndentation}` );
		result += value + strings[i].replace( pattern, '' );

		trailingIndentation = getTrailingIndentation( result );
	}

	return result.trim();
}