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

.github/actions/ci-setup/action.yml

@@ -0,0 +1,14 @@
+name: Setup CI
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version-file: ".node-version"
+        cache: yarn
+
+    - name: Install dependencies
+      shell: bash
+      run: yarn install --frozen-lockfile

.github/workflows/ci.yml

@@ -13,16 +13,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout Repo
-        uses: actions/checkout@v4
-
-      - name: Use Node.js 20
-        uses: actions/setup-node@v4
+      - uses: actions/checkout@v4
         with:
-          node-version: 20.x
+          ref: ${{ github.event.pull_request.head.sha }}
 
-      - name: Install Dependencies
-        run: yarn --frozen-lockfile
+      - uses: ./.github/actions/ci-setup
 
       - name: Typecheck
         run: yarn typecheck

.github/workflows/release-pr.yml

@@ -37,6 +37,7 @@ jobs:
     needs: release_check
     steps:
       - uses: actions/checkout@v4
+      - uses: ./.github/actions/ci-setup
 
       - name: Checkout pull request
         run: gh pr checkout ${{ github.event.issue.number }}
@@ -54,14 +55,6 @@ jobs:
         if: steps.check_version_packages.outputs.version_packages == 'true'
         run: git reset --hard HEAD~1
 
-      - name: Use Node.js 20
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20.x
-
-      - name: Install Dependencies
-        run: yarn --frozen-lockfile
-
       - run: yarn changeset version --snapshot pr${{ github.event.issue.number }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/version-or-publish.yml

@@ -11,16 +11,8 @@ jobs:
   changesets:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout Repo
-        uses: actions/checkout@v4
-
-      - name: Use Node.js 20
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20.x
-
-      - name: Install Dependencies
-        run: yarn --frozen-lockfile
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/ci-setup
 
       - name: Build
         run: yarn build

.node-version

@@ -0,0 +1 @@
+v22.9.0

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Debug Current Test File",
+      "autoAttachChildProcesses": true,
+      "program": "${workspaceRoot}/node_modules/vitest/vitest.mjs",
+      "args": ["run", "${relativeFile}"],
+      "smartStep": true,
+      "console": "integratedTerminal"
+    }
+  ]
+}

package.json

@@ -2,11 +2,12 @@
   "name": "@changesets/action",
   "version": "1.5.2",
   "main": "dist/index.js",
+  "type": "module",
   "license": "MIT",
   "devDependencies": {
-    "@changesets/changelog-github": "^0.4.2",
-    "@changesets/cli": "^2.20.0",
-    "@changesets/write": "^0.1.6",
+    "@changesets/changelog-github": "^0.5.1",
+    "@changesets/cli": "^2.29.3",
+    "@changesets/write": "^0.4.0",
     "@types/node": "^22.15.17",
     "@types/semver": "^7.5.0",
     "esbuild": "^0.25.4",
@@ -17,14 +18,14 @@
     "vitest": "^3.1.3"
   },
   "scripts": {
-    "build": "esbuild src/index.ts --bundle --platform=node --target=node20 --minify --outfile=dist/index.js",
+    "build": "esbuild src/index.ts --bundle --platform=node --target=node20 --format=esm --minify --outfile=dist/index.js",
     "test": "vitest",
     "test:watch": "yarn test --watch",
     "typecheck": "tsc",
     "changeset": "changeset",
-    "bump": "node ./scripts/bump.js",
-    "release": "node ./scripts/release.js",
-    "release:pr": "node ./scripts/release-pr.js"
+    "bump": "node --experimental-strip-types ./scripts/bump.ts",
+    "release": "node --experimental-strip-types ./scripts/release.ts",
+    "release:pr": "node --experimental-strip-types ./scripts/release-pr.ts"
   },
   "engines": {
     "node": ">= 20"
@@ -34,8 +35,8 @@
     "@actions/exec": "^1.1.1",
     "@actions/github": "^6.0.1",
     "@changesets/ghcommit": "^2.0.0",
-    "@changesets/pre": "^1.0.9",
-    "@changesets/read": "^0.5.3",
+    "@changesets/pre": "^2.0.2",
+    "@changesets/read": "^0.6.5",
     "@manypkg/get-packages": "^1.1.3",
     "@octokit/core": "^5.2.1",
     "@octokit/plugin-throttling": "^8.0.0",
@@ -43,7 +44,6 @@
     "mdast-util-to-string": "^1.0.6",
     "remark-parse": "^7.0.1",
     "remark-stringify": "^7.0.3",
-    "resolve-from": "^5.0.0",
     "semver": "^7.5.3",
     "unified": "^8.3.2"
   },

scripts/bump.js

@@ -1,19 +0,0 @@
-const fs = require("fs");
-const path = require("path");
-const { exec } = require("@actions/exec");
-
-process.chdir(path.join(__dirname, ".."));
-
-(async () => {
-  await exec("changeset", ["version"]);
-
-  const releaseLine = `v${require("../package.json").version.split(".")[0]}`;
-
-  const readmePath = path.join(__dirname, "..", "README.md");
-  const content = fs.readFileSync(readmePath, "utf8");
-  const updatedContent = content.replace(
-    /changesets\/action@[^\s]+/g,
-    `changesets/action@${releaseLine}`
-  );
-  fs.writeFileSync(readmePath, updatedContent);
-})();

scripts/bump.ts

@@ -0,0 +1,18 @@
+import { exec } from "@actions/exec";
+import fs from "node:fs";
+import path from "node:path";
+import pkgJson from "../package.json" with { type: "json" };
+
+process.chdir(path.join(import.meta.dirname, ".."));
+
+await exec("changeset", ["version"]);
+
+const releaseLine = `v${pkgJson.version.split(".")[0]}`;
+
+const readmePath = path.join(import.meta.dirname, "..", "README.md");
+const content = fs.readFileSync(readmePath, "utf8");
+const updatedContent = content.replace(
+  /changesets\/action@[^\s]+/g,
+  `changesets/action@${releaseLine}`
+);
+fs.writeFileSync(readmePath, updatedContent);

scripts/release-pr.js

@@ -1,21 +0,0 @@
-const path = require("path");
-const { exec, getExecOutput } = require("@actions/exec");
-
-const { version } = require("../package.json");
-const tag = `v${version}`;
-const releaseLine = "pr-release";
-
-process.chdir(path.join(__dirname, ".."));
-
-(async () => {
-  await exec("git", ["checkout", "--detach"]);
-  await exec("git", ["add", "--force", "dist"]);
-  await exec("git", ["commit", "-m", tag]);
-
-  await exec("git", [
-    "push",
-    "--force",
-    "origin",
-    `HEAD:refs/heads/${releaseLine}`,
-  ]);
-})();

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}`,
+]);

scripts/release.ts

@@ -1,11 +1,12 @@
-const path = require("path");
-const { exec, getExecOutput } = require("@actions/exec");
+import { exec, getExecOutput } from "@actions/exec";
+import path from "node:path";
 
-const { version } = require("../package.json");
-const tag = `v${version}`;
-const releaseLine = `v${version.split(".")[0]}`;
+import pkgJson from "../package.json" with { type: "json" };
 
-process.chdir(path.join(__dirname, ".."));
+const tag = `v${pkgJson.version}`;
+const releaseLine = `v${pkgJson.version.split(".")[0]}`;
+
+process.chdir(path.join(import.meta.dirname, ".."));
 
 (async () => {
   const { exitCode, stderr } = await getExecOutput(

src/git.ts

@@ -2,7 +2,7 @@ import * as core from "@actions/core";
 import { exec, getExecOutput } from "@actions/exec";
 import * as github from "@actions/github";
 import { commitChangesFromRepo } from "@changesets/ghcommit/git";
-import { Octokit } from "./octokit";
+import type { Octokit } from "./octokit.ts";
 
 type GitOptions = {
   cwd: string;

src/index.ts

@@ -1,11 +1,11 @@
 import * as core from "@actions/core";
 import fs from "node:fs/promises";
 import path from "node:path";
-import { Git } from "./git";
-import { setupOctokit } from "./octokit";
-import readChangesetState from "./readChangesetState";
-import { runPublish, runVersion } from "./run";
-import { fileExists } from "./utils";
+import { Git } from "./git.ts";
+import { setupOctokit } from "./octokit.ts";
+import readChangesetState from "./readChangesetState.ts";
+import { runPublish, runVersion } from "./run.ts";
+import { fileExists } from "./utils.ts";
 
 const getOptionalInput = (name: string) => core.getInput(name) || undefined;
 

src/readChangesetState.ts

@@ -1,4 +1,4 @@
-import { PreState, NewChangeset } from "@changesets/types";
+import type { PreState, NewChangeset } from "@changesets/types";
 import { readPreState } from "@changesets/pre";
 import readChangesets from "@changesets/read";
 

src/run.test.ts

@@ -1,12 +1,12 @@
-import { Changeset } from "@changesets/types";
+import type { Changeset } from "@changesets/types";
 import writeChangeset from "@changesets/write";
 import fixturez from "fixturez";
 import fs from "node:fs/promises";
 import path from "node:path";
 import { beforeEach, describe, expect, it, vi } from "vitest";
-import { Git } from "./git";
-import { setupOctokit } from "./octokit";
-import { runVersion } from "./run";
+import { Git } from "./git.ts";
+import { setupOctokit } from "./octokit.ts";
+import { runVersion } from "./run.ts";
 
 vi.mock("@actions/github", () => ({
   context: {
@@ -21,7 +21,7 @@ vi.mock("@actions/github", () => ({
     rest: mockedGithubMethods,
   }),
 }));
-vi.mock("./git");
+vi.mock("./git.ts");
 vi.mock("@changesets/ghcommit/git");
 
 let mockedGithubMethods = {
@@ -34,11 +34,11 @@ let mockedGithubMethods = {
   },
 };
 
-let f = fixturez(__dirname);
+let f = fixturez(import.meta.dirname);
 
 const linkNodeModules = async (cwd: string) => {
   await fs.symlink(
-    path.join(__dirname, "..", "node_modules"),
+    path.join(import.meta.dirname, "..", "node_modules"),
     path.join(cwd, "node_modules")
   );
 };

src/run.ts

@@ -1,22 +1,24 @@
 import * as core from "@actions/core";
 import { exec, getExecOutput } from "@actions/exec";
 import * as github from "@actions/github";
-import { PreState } from "@changesets/types";
-import { Package, getPackages } from "@manypkg/get-packages";
+import type { PreState } from "@changesets/types";
+import { type Package, getPackages } from "@manypkg/get-packages";
 import fs from "node:fs/promises";
+import { createRequire } from "node:module";
 import path from "node:path";
-import resolveFrom from "resolve-from";
-import semverLt from "semver/functions/lt";
-import { Git } from "./git";
-import { Octokit } from "./octokit";
-import readChangesetState from "./readChangesetState";
+import semverLt from "semver/functions/lt.js";
+import { Git } from "./git.ts";
+import type { Octokit } from "./octokit.ts";
+import readChangesetState from "./readChangesetState.ts";
 import {
   getChangedPackages,
   getChangelogEntry,
   getVersionsByDirectory,
   isErrorWithCode,
   sortTheThings,
-} from "./utils";
+} from "./utils.ts";
+
+const require = createRequire(import.meta.url);
 
 // GitHub Issues/PRs messages have a max size limit on the
 // message body payload.
@@ -162,7 +164,9 @@ export async function runPublish({
 
 const requireChangesetsCliPkgJson = (cwd: string) => {
   try {
-    return require(resolveFrom(cwd, "@changesets/cli/package.json"));
+    return require(require.resolve("@changesets/cli/package.json", {
+      paths: [cwd],
+    }));
   } catch (err) {
     if (isErrorWithCode(err, "MODULE_NOT_FOUND")) {
       throw new Error(
@@ -286,9 +290,18 @@ export async function runVersion({
     let cmd = semverLt(changesetsCliPkgJson.version, "2.0.0")
       ? "bump"
       : "version";
-    await exec("node", [resolveFrom(cwd, "@changesets/cli/bin.js"), cmd], {
-      cwd,
-    });
+    await exec(
+      "node",
+      [
+        require.resolve("@changesets/cli/bin.js", {
+          paths: [cwd],
+        }),
+        cmd,
+      ],
+      {
+        cwd,
+      }
+    );
   }
 
   let changedPackages = await getChangedPackages(cwd, versionsByDirectory);

src/utils.test.ts

@@ -1,5 +1,5 @@
 import { expect, test } from "vitest";
-import { BumpLevels, getChangelogEntry, sortTheThings } from "./utils";
+import { BumpLevels, getChangelogEntry, sortTheThings } from "./utils.ts";
 
 let changelog = `# @keystone-alpha/email
 

src/utils.ts

@@ -5,7 +5,7 @@ import fs from "node:fs/promises";
 import type { Root } from "mdast";
 // @ts-ignore
 import mdastToString from "mdast-util-to-string";
-import { getPackages, Package } from "@manypkg/get-packages";
+import { getPackages, type Package } from "@manypkg/get-packages";
 
 export const BumpLevels = {
   dep: 0,

tsconfig.json

@@ -1,12 +1,14 @@
 {
   "compilerOptions": {
-    "target": "esnext",
-    "module": "node18",
-    "noEmit": true,
-    "isolatedModules": true,
-    "strict": true,
-    "moduleResolution": "node16",
+    "allowImportingTsExtensions": true,
     "erasableSyntaxOnly": true,
-    "skipLibCheck": true
+    "isolatedModules": true,
+    "module": "node18",
+    "moduleResolution": "node16",
+    "noEmit": true,
+    "resolveJsonModule": true,
+    "strict": true,
+    "target": "esnext",
+    "verbatimModuleSyntax": true
   }
 }