feat: migrate to esm

.eslintrc.js → .eslintrc.cjs

@@ -3,6 +3,10 @@ require("@html-validate/eslint-config/patch/modern-module-resolution");
 module.exports = {
 	extends: ["@html-validate"],
 
+	rules: {
+		"import/extensions": "off",
+	},
+
 	overrides: [
 		{
 			files: "*.ts",
@@ -13,5 +17,12 @@ module.exports = {
 			excludedFiles: ["cypress/**", "tests/e2e/**"],
 			extends: ["@html-validate/jest"],
 		},
+		{
+			files: "bin/*.js",
+			rules: {
+				/* should lint without errors even if project isn't compiled */
+				"import/no-unresolved": "off",
+			},
+		},
 	],
 };

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
           npm pack
           npm run self-test
       - name: Jest
-        run: npm test
+        run: npm --ignore-scripts test
         env:
           CI: true
       - name: Coveralls

bin/index.js

@@ -1,2 +1,2 @@
 #!/usr/bin/env node
-require("../dist/index");
+import "../dist/index.js";

build.mjs

@@ -0,0 +1,29 @@
+import * as esbuild from "esbuild";
+
+const cjsCompat = `
+import { createRequire } from "node:module";
+const require = createRequire(import.meta.url);
+`;
+
+async function run() {
+	const result = await esbuild.build({
+		entryPoints: ["src/index.ts"],
+		outdir: "dist",
+		sourcemap: true,
+		bundle: true,
+		platform: "node",
+		target: "node14",
+		format: "esm",
+		banner: {
+			js: cjsCompat,
+		},
+		metafile: true,
+		logLevel: "info",
+	});
+	console.log(await esbuild.analyzeMetafile(result.metafile));
+}
+
+run().catch((err) => {
+	console.error(err);
+	process.exitCode = 1;
+});

package.json

@@ -18,6 +18,7 @@
   "author": "David Sveningsson <ext@sidvind.com>",
   "main": "dist/index.js",
   "bin": "bin/index.js",
+  "type": "module",
   "files": [
     "bin",
     "dist",
@@ -26,7 +27,7 @@
   ],
   "scripts": {
     "prebuild": "tsc",
-    "build": "esbuild src/index.ts --bundle --platform=node --target=node14.0 --analyze --sourcemap --outdir=dist",
+    "build": "node build.mjs",
     "eslint": "eslint .",
     "eslint:fix": "eslint --fix .",
     "prepack": "release-prepack package.json --bundle",
@@ -37,6 +38,7 @@
     "prettier:write": "prettier --write .",
     "postpublish": "release-postpublish package.json",
     "self-test": "node bin/index.js",
+    "pretest": "npm run prettier:check && npm run eslint",
     "test": "jest"
   },
   "commitlint": {

src/index.ts

@@ -1,7 +1,7 @@
 /* eslint-disable no-console, no-process-exit -- this is a cli tool */
 
-import { existsSync, createWriteStream, promises as fs } from "fs";
-import path from "path";
+import { existsSync, createWriteStream, promises as fs } from "node:fs";
+import path from "node:path";
 import { ArgumentParser } from "argparse";
 import findUp from "find-up";
 import tmp from "tmp";

tsconfig.json

@@ -6,7 +6,8 @@
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
     "lib": ["es2020"],
-    "module": "commonjs",
+    "module": "esnext",
+    "moduleResolution": "bundler",
     "noImplicitAny": true,
     "noEmit": true,
     "outDir": "dist",