changesets-action/scripts/release.ts

import { Buffer } from "node:buffer";
import path from "node:path";
import { exec, getExecOutput } from "@actions/exec";
import pkgJson from "../package.json" with { type: "json" };

const tag = `v${pkgJson.version}`;
const releaseLine = `v${pkgJson.version.split(".")[0]}`;
const isPrerelease = pkgJson.version.includes("-");
const githubToken = process.env.GITHUB_TOKEN;
if (!githubToken) {
  throw new Error("GITHUB_TOKEN is required");
}
const basic = Buffer.from(`x-access-token:${githubToken}`).toString("base64");
const gitEnv = {
  ...process.env,
  GIT_CONFIG_COUNT: "1",
  GIT_CONFIG_KEY_0: "http.https://github.com/.extraheader",
  GIT_CONFIG_VALUE_0: `AUTHORIZATION: basic ${basic}`,
};

process.chdir(path.join(import.meta.dirname, ".."));

(async () => {
  const { exitCode, stderr } = await getExecOutput(
    `git`,
    ["ls-remote", "--exit-code", "origin", "--tags", `refs/tags/${tag}`],
    {
      ignoreReturnCode: true,
    },
  );
  if (exitCode === 0) {
    console.log(
      `Action is not being published because version ${tag} is already published`,
    );
    return;
  }
  if (exitCode !== 2) {
    throw new Error(`git ls-remote exited with ${exitCode}:\n${stderr}`);
  }

  await exec("git", ["checkout", "--detach"]);
  await exec("git", ["add", "--force", "dist"]);
  await exec("git", ["commit", "-m", tag]);

  await exec("changeset", ["git-tag"]);

  if (isPrerelease) {
    await exec("git", ["push", "origin", `refs/tags/${tag}`], {
      env: gitEnv,
    });
    return;
  }

  await exec(
    "git",
    [
      "push",
      "--force",
      "--follow-tags",
      "origin",
      `HEAD:refs/heads/${releaseLine}`,
    ],
    {
      env: gitEnv,
    },
  );
})();