Function indent

lib/stats/DefaultStatsPrinterPlugin.js:1271–1276

(str, prefix, noPrefixInFirstLine)

 * @returns {string} result
 */
const indent = (str, prefix, noPrefixInFirstLine) => {
	const rem = str.replace(/\n([^\n])/g, `\n${prefix}$1`);
	if (noPrefixInFirstLine) return rem;
	const ind = str[0] === "\n" ? "" : prefix;
	return ind + rem;
};

/**
 * Join explicit new line.