version.ts

/**
 * @see {@link https://github.com/oven-sh/bun/issues/5291#issuecomment-2506719866}
 */

import { fail } from "node:assert";
import { $ } from "bun";
import { type ReleaseType, inc, valid as isValidVersion } from "semver";

const path = "./package.json";
const variants: ReleaseType[] = [
	"major",
	"premajor",
	"minor",
	"preminor",
	"patch",
	"prepatch",
	"prerelease",
];

const isValidTarget = (subject: string): subject is ReleaseType =>
	(variants as string[]).includes(subject);

const isDirty = async () => (await $`git status --porcelain`.quiet()).text();

const target = Bun.argv.pop();
const json = await Bun.file(path).json();
const { version: current } = json;

if (!isValidVersion(current))
	throw new Error(`Invalid current version ${current}`);

if (await isDirty())
	throw new Error(
		"There are uncommitted changes. Commit them before releasing.",
	);

const desired = isValidVersion(target)
	? target
	: target && isValidTarget(target)
		? inc(current, target, "beta", "1")
		: fail("invalid target version");

if (!desired) throw new Error("Failed to bump");
console.debug(current, "—>", desired);

await Bun.write(
	path,
	JSON.stringify(Object.assign(json, { version: desired }), null, 2),
);

await $`git add ${path}`;
await $`git commit -m v${desired}`;
await $`git tag v${desired}`;
await $`git push`;
await $`git push --tags`;