Basic script to generate changelog for commits before conventional commits

prevChangelog.js

const child = require("child_process");
const fs = require("fs");

const output = child
	.execSync(`git log --format=%B%H----DELIMITER----`)
	.toString("utf-8");

const commitsArray = output
	.split("----DELIMITER----\n")
	.map(commit => {
		const [message, sha] = commit.split("\n");

		return { sha, message };
	})
	.filter(commit => Boolean(commit.sha));

const firstCommit = child
	.execSync(`git rev-list --max-parents=0 HEAD`)
	.toString("utf-8").slice(0, -1);
const currentVersion = require("./package.json").version;

let newChangelog = `# [v${currentVersion}](https://github.com/AnkitC1598/admin/commit/${firstCommit}...${currentVersion}) (${new Date().toISOString().split("T")[0]})\n\n`;

const commits = [];

commitsArray.forEach(commit => {
	if (commit.sha === firstCommit) commit.message = '1.0.0' + ` [${commit.message}]`
		commits.push(
			`* ${commit.message} ([${commit.sha.substring(
				0,
				6
			)}](https://github.com/AnkitC1598/admin/commit/${commit.sha
			}))\n`
		);
	}
);

if (commits.length) {
	newChangelog += `## Commits\n`;
	commits.forEach(commit => {
		newChangelog += commit;
	});
	newChangelog += '\n';
}

fs.writeFileSync("./CHANGELOG.md", `${newChangelog}`);