Migrate to ESM (#484)

* Migrate to ESM

* just use `require.resolve`

* reuse setup action

* checkout PR head for a sec

* ls things

* try a thing

* the dirname had a trailing whitespace, lol

scripts/release-pr.ts

@@ -0,0 +1,20 @@
+import { exec } from "@actions/exec";
+import path from "node:path";
+
+import pkgJson from "../package.json" with { type: "json" };
+
+const tag = `v${pkgJson.version}`;
+const releaseLine = "pr-release";
+
+process.chdir(path.join(__dirname, ".."));
+
+await exec("git", ["checkout", "--detach"]);
+await exec("git", ["add", "--force", "dist"]);
+await exec("git", ["commit", "-m", tag]);
+
+await exec("git", [
+  "push",
+  "--force",
+  "origin",
+  `HEAD:refs/heads/${releaseLine}`,
+]);