Use btr logging in console output

Author: maier49

src/logger.ts

@@ -90,9 +90,49 @@ ${logSymbols.error} errors: ${stats.errors.length}
 ${logSymbols.warning} warnings: ${stats.warnings.length}
 ${errors}${warnings}
 ${chunkAndAssetLog}
+${buildBtrLog(stats)}
 ${chalk.yellow(`output at: ${chalk.cyan(chalk.underline(`file:///${outputPath}`))}`)}
 
 ${signOff}
 	`);
 	return !!errors;
 }
+
+function buildBtrLog(stats: any) {
+	const btrLogs: string[] =
+		stats &&
+		stats.logging &&
+		stats.logging.BuildTimeRender &&
+		stats.logging.BuildTimeRender.entries
+			.filter(({ type }: { type: string }) => type === 'info')
+			.map(({ message }: { message: string }) => message);
+
+	const pagesVisited = btrLogs
+		.filter((message) => message.startsWith('Visited:'))
+		.map((message) => message.split('Visited:')[1]);
+	const pagesDiscovered = btrLogs
+		.filter((message) => message.startsWith('Discovered:'))
+		.map((message) => message.split('Discovered:')[1]);
+	const slowPages = btrLogs
+		.filter((message) => message.startsWith('Slow:'))
+		.map((message) => message.split('Slow:')[1].split(':Took:'));
+
+	let logs = '';
+	if (pagesVisited.length) {
+		logs += `Visited the following pages during BTR:\n${pagesVisited.map((page) => `${page}`).join('\n')}\n\n\n`;
+	}
+
+	if (pagesDiscovered.length) {
+		logs += `Discovered the following pages during BTR:\n${pagesDiscovered
+			.map((page) => `${page}`)
+			.join('\n')}\n\n\n`;
+	}
+
+	if (slowPages.length) {
+		logs += `These modules were slow to render during BTR:\n${slowPages
+			.map(([page, time]) => `${page} took ${time} seconds`)
+			.join('\n')}\n\n\n`;
+	}
+
+	return logs;
+}