refactor: use ESM + CJS exports

package.json

@@ -3,9 +3,18 @@
   "private": false,
   "version": "0.8.1",
   "description": "☔️ The world's first V8 and JSC coverage tool to generate reports for Node.js, Bun, Deno, and TypeScript at the same time.",
-  "type": "commonjs",
+  "type": "module",
   "main": "./lib/index.js",
+  "module": "./lib/index.js",
   "types": "./lib/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/index.d.ts",
+      "import": "./lib/index.js",
+      "require": "./lib/index.cjs",
+      "default": "./lib/index.js"
+    }
+  },
   "bin": {
     "coverage": "./lib/bin/cli.js"
   },
@@ -47,7 +56,7 @@
   },
   "peerDependencies": {
     "poku": "^4.3.0",
-    "typescript": "^6.0.3"
+    "typescript": "^5.9.3 || ^6.0.3"
   },
   "peerDependenciesMeta": {
     "poku": {
@@ -63,22 +72,18 @@
     "@sveltejs/acorn-typescript": "^1.0.9",
     "@types/lcov-parse": "^1.0.2",
     "@types/node": "^25.6.0",
-    "acorn": "^8.16.0",
     "cross-env": "^10.1.0",
     "domhandler": "^6.0.1",
     "dts-bundle-generator": "^9.5.1",
     "esbuild": "^0.28.0",
     "fast-xml-parser": "^5.7.2",
     "htmlparser2": "^12.0.0",
-    "jsonc.min": "^1.1.2",
     "lcov-parse": "^1.0.0",
     "packages-update": "^2.0.0",
     "poku": "^4.3.0",
     "prettier": "^3.8.3",
-    "toml.min": "^1.0.0",
     "tsx": "^4.21.0",
-    "typescript": "^6.0.3",
-    "yaml.min": "^1.0.0"
+    "typescript": "^6.0.3"
   },
   "publishConfig": {
     "access": "public"
@@ -124,5 +129,11 @@
     "monocart-coverage-reports",
     "monocart",
     "one-double-zero"
-  ]
+  ],
+  "dependencies": {
+    "acorn": "^8.16.0",
+    "jsonc.min": "^1.1.2",
+    "toml.min": "^1.0.0",
+    "yaml.min": "^1.0.0"
+  }
 }

poku.config.js

@@ -1,18 +1,19 @@
 // @ts-check
 
-'use strict';
-
-const { cp, readdir, rm } = require('node:fs/promises');
-const { homedir, platform } = require('node:os');
-const { basename, join } = require('node:path');
-const { env } = require('node:process');
-const { defineConfig } = require('poku');
-const { coverage } = require('./lib/index.js');
-
-const fixturesRoot = join(__dirname, 'test', '__fixtures__', 'e2e');
-const snapshotsRoot = join(__dirname, 'test', '__snapshots__', 'e2e');
+import { cp, readdir, rm } from 'node:fs/promises';
+import { homedir, platform } from 'node:os';
+import { basename, dirname, join } from 'node:path';
+import { env } from 'node:process';
+import { fileURLToPath } from 'node:url';
+import { defineConfig } from 'poku';
+import { coverage } from './lib/index.js';
+
+const rootDir = dirname(fileURLToPath(import.meta.url));
+
+const fixturesRoot = join(rootDir, 'test', '__fixtures__', 'e2e');
+const snapshotsRoot = join(rootDir, 'test', '__snapshots__', 'e2e');
 const reportersResourcesRoot = join(
-  __dirname,
+  rootDir,
   'test',
   '__resources__',
   'e2e',
@@ -117,7 +118,7 @@ const clearPlatformSnapshots = async (directory = snapshotsRoot) => {
   );
 };
 
-module.exports = defineConfig({
+export default defineConfig({
   include: ['test/e2e'],
   reporter: 'compact',
   timeout: 30000,

scripts/lint-types.sh

@@ -27,7 +27,7 @@ fi
 
 doubleCastHits="$(
   cd "$repositoryRoot" && find . \
-    \( -path './.git' -o -path './node_modules' -o -path './lib' -o -path './tools/debug' \) -prune -o \
+    \( -path './.git' -o -name 'node_modules' -o -path './lib' -o -path './tools/debug' \) -prune -o \
     -type f \( -name '*.ts' -o -name '*.mts' -o -name '*.cts' \) \
     ! -name "$(basename "${BASH_SOURCE[0]}")" \
     -print0 \

src/converters/shared/ast-cache.ts

@@ -1,5 +1,4 @@
 import type { Options, Program } from 'acorn';
-// @ts-expect-error: ESM-only package
 import { tsPlugin } from '@sveltejs/acorn-typescript';
 import { Parser } from 'acorn';
 

src/reporters/html-spa/copy-assets.ts

@@ -1,4 +1,5 @@
 import { join } from 'node:path';
+import { moduleDir } from '../../utils/module-dir.js';
 import { copyAssetSet } from '../shared/html/copy-assets.js';
 import {
   HTML_ASSET_FILENAMES,
@@ -12,7 +13,7 @@ const SPA_ASSET_FILENAMES: readonly string[] = [
 ];
 
 const spaAssetsDir = (): string =>
-  join(__dirname, '..', 'resources', 'html-spa');
+  join(moduleDir.from(import.meta.url), '..', 'resources', 'html-spa');
 
 export const copyAssets = (reportsDir: string): void => {
   copyAssetSet(reportsDir, htmlAssetsDir(), HTML_ASSET_FILENAMES);

src/reporters/shared/html/html-assets.ts

@@ -1,4 +1,5 @@
 import { join } from 'node:path';
+import { moduleDir } from '../../../utils/module-dir.js';
 
 export const HTML_ASSET_FILENAMES: readonly string[] = [
   'base.css',
@@ -11,4 +12,4 @@ export const HTML_ASSET_FILENAMES: readonly string[] = [
 ];
 
 export const htmlAssetsDir = (): string =>
-  join(__dirname, '..', 'resources', 'html');
+  join(moduleDir.from(import.meta.url), '..', 'resources', 'html');

src/runtimes/bun.ts

@@ -4,6 +4,7 @@ import type { CoverageOptions, CoverageState } from '../@types/coverage.js';
 import type { JscInspectorHandle } from '../@types/jsc.js';
 import type { DataListener } from '../@types/runtimes.js';
 import { join } from 'node:path';
+import { moduleDir } from '../utils/module-dir.js';
 import { strings } from '../utils/strings.js';
 import { jscInspector } from './bun/inspector.js';
 import { FLUSH_MARKER } from './bun/marker.js';
@@ -12,7 +13,10 @@ import { lifecycle } from './lifecycle.js';
 const INSPECTOR_URL_PATTERN =
   /ws:\/\/(?:\d{1,3}(?:\.\d{1,3}){3}|\[[0-9a-fA-F:]+\]|[A-Za-z0-9.-]+):\d{1,5}\/[A-Za-z0-9._-]+/;
 
-const PRELOAD_SCRIPT_PATH = join(__dirname, 'preload-bun.js');
+const PRELOAD_SCRIPT_PATH = join(
+  moduleDir.from(import.meta.url),
+  'preload-bun.js'
+);
 
 const makeLineFilter = (
   file: string,

src/utils/module-dir.ts

@@ -0,0 +1,6 @@
+import { dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const from = (metaUrl: string): string => dirname(fileURLToPath(metaUrl));
+
+export const moduleDir = { from } as const;

tools/build.mts

@@ -19,31 +19,49 @@ const buildOptions: BuildOptions = {
   target: 'node16',
   logLevel: 'info',
   treeShaking: true,
-  format: 'cjs',
-  external: ['jsonc.min', 'poku', 'poku/plugin', 'toml.min', 'yaml.min'],
+  minifySyntax: true,
+  external: [
+    'acorn',
+    'jsonc.min',
+    'poku',
+    'poku/plugin',
+    'toml.min',
+    'yaml.min',
+  ],
 };
 
 await rm('lib', { recursive: true, force: true });
 await mkdir('lib', { recursive: true });
 await Promise.all([
   build({
     ...buildOptions,
+    format: 'esm',
     entryPoints: ['src/index.ts'],
     outfile: 'lib/index.js',
-    minifySyntax: true,
   }),
   build({
     ...buildOptions,
+    format: 'cjs',
+    entryPoints: ['src/index.ts'],
+    outfile: 'lib/index.cjs',
+    banner: {
+      js: "const __importMetaUrl = require('node:url').pathToFileURL(__filename).href;",
+    },
+    define: { 'import.meta.url': '__importMetaUrl' },
+  }),
+  build({
+    ...buildOptions,
+    format: 'esm',
     entryPoints: ['src/runtimes/bun/preload.ts'],
     outfile: 'lib/preload-bun.js',
     minify: true,
   }),
   build({
     ...buildOptions,
+    format: 'esm',
     entryPoints: ['src/bin/cli.ts'],
     outfile: 'lib/bin/cli.js',
     banner: { js: '#!/usr/bin/env node' },
-    minifySyntax: true,
     external: ['../index.js'],
   }),
   writeFile('lib/index.d.ts', dtsBundle, 'utf-8'),