Add script for tagging all npm packages for a release

CONTRIBUTING.md

@@ -447,7 +447,7 @@ To build a new version and release it on NPM, follow these steps:
 1. Verify that the playground bundle for the new version is now present on the settings tab in https://rescript-lang.org/try.
 1. Run `npm info rescript` to verify that the new version is now present with tag "ci".
 1. Test the new version.
-1. Tag the new version as appropriate (`latest` or `next`): `npm dist-tag add rescript@<version> <tag>`
+1. Tag all packages for the new version as appropriate (`latest` or `next`): `./scripts/npmRelease.js --version <version> --tag <tag>`
 1. Create a release entry for the version tag on the [Github Releases page](https://github.com/rescript-lang/rescript-compiler/releases), copying the changes from `CHANGELOG.md`.
 1. Create a PR with the following changes to prepare for development of the next version:
    - Increment the `EXPECTED_VERSION` number in `yarn.config.cjs` for the next version.

scripts/npmRelease.js

@@ -0,0 +1,105 @@
+#!/usr/bin/env node
+/**
+ * Tag a published version of the main ReScript packages with a given dist-tag.
+ *
+ * Usage:
+ *   node scripts/npmRelease.js --version 12.0.1 --tag next
+ *   node scripts/npmRelease.js --version 12.0.1 --tag latest --otp 123456
+ *
+ * - Runs `npm dist-tag add` for: rescript, @rescript/runtime, and all platform
+ *   optional packages, reusing the same OTP so you only get prompted once.
+ * - Pass `--dry-run` to see the commands without executing them.
+ */
+import { spawn } from "node:child_process";
+import process from "node:process";
+import readline from "node:readline/promises";
+import { parseArgs } from "node:util";
+
+const packages = [
+  "rescript",
+  "@rescript/runtime",
+  "@rescript/darwin-arm64",
+  "@rescript/darwin-x64",
+  "@rescript/linux-arm64",
+  "@rescript/linux-x64",
+  "@rescript/win32-x64",
+];
+
+async function promptForOtp(existingOtp) {
+  if (existingOtp) {
+    return existingOtp;
+  }
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+  });
+  const answer = await rl.question("npm one-time password: ");
+  rl.close();
+  return answer.trim();
+}
+
+async function runDistTag(pkg, version, tag, otp, dryRun) {
+  const spec = `${pkg}@${version}`;
+  const args = ["dist-tag", "add", spec, tag, "--otp", otp];
+  if (dryRun) {
+    console.log(`[dry-run] npm ${args.join(" ")}`);
+    return;
+  }
+  console.log(`Tagging ${spec} as ${tag}...`);
+  await new Promise((resolve, reject) => {
+    const child = spawn("npm", args, { stdio: "inherit" });
+    child.on("exit", code => {
+      if (code === 0) {
+        resolve();
+      } else {
+        reject(new Error(`npm dist-tag failed for ${spec} (exit ${code})`));
+      }
+    });
+    child.on("error", reject);
+  });
+}
+
+async function main() {
+  try {
+    const { values } = parseArgs({
+      args: process.argv.slice(2),
+      strict: true,
+      options: {
+        version: { type: "string", short: "v" },
+        tag: { type: "string", short: "t" },
+        otp: { type: "string" },
+        "dry-run": { type: "boolean" },
+      },
+    });
+    if (!values.version || !values.tag) {
+      console.error(
+        "Usage: node scripts/npmRelease.js --version <version> --tag <tag> [--otp <code>] [--dry-run]",
+      );
+      process.exitCode = 1;
+      return;
+    }
+    const otp = await promptForOtp(values.otp);
+    if (!otp) {
+      throw new Error("OTP is required to publish dist-tags.");
+    }
+    for (const pkg of packages) {
+      await runDistTag(
+        pkg,
+        values.version,
+        values.tag,
+        otp,
+        Boolean(values["dry-run"]),
+      );
+    }
+    if (values["dry-run"]) {
+      console.log("Dry run complete.");
+    } else {
+      console.log("All packages tagged successfully.");
+    }
+  } catch (error) {
+    console.error(error.message || error);
+    process.exitCode = 1;
+  }
+}
+
+await main();