Function getOldLog

scripts/pre-release.mjs:70–77

()

			return logs.map(v => v.trim()).join('\n');
		};
		const getOldLog = async () => {
			const log = await readFile(FILES.chlog, enc);
			const idx = log.indexOf('#');
			return [
				log.slice(0, idx),
				log.slice(idx),
			];
		};
		const [newLog, [logHead, oldLog]] = await Promise.all([ getNewLog(), getOldLog() ]);
		return `${logHead}# ${newver}\n${newLog}\n\n${oldLog}`;