feat: allow named import usage

The main exports of the package are now available both as named exports
from the package as well as the previously available properties from
the default export. This removes the requirement to use the `esModuleInterop`
TypeScript option but retains backward compatiblity for existing usage.

package.json

@@ -2,11 +2,11 @@
   "name": "piscina",
   "version": "4.3.2",
   "description": "A fast, efficient Node.js Worker Thread Pool implementation",
-  "main": "./dist/src/index.js",
+  "main": "./dist/src/main.js",
   "exports": {
     "types": "./dist/src/index.d.ts",
     "import": "./dist/esm-wrapper.mjs",
-    "require": "./dist/src/index.js"
+    "require": "./dist/src/main.js"
   },
   "types": "./dist/src/index.d.ts",
   "scripts": {

src/index.ts

@@ -1074,7 +1074,7 @@ class ThreadPool {
   }
 }
 
-class Piscina extends EventEmitterAsyncResource {
+export default class Piscina extends EventEmitterAsyncResource {
   #pool : ThreadPool;
 
   constructor (options : Options = {}) {
@@ -1346,4 +1346,14 @@ class Piscina extends EventEmitterAsyncResource {
   static get queueOptionsSymbol () { return kQueueOptions; }
 }
 
-export = Piscina;
+export const move = Piscina.move;
+export const isWorkerThread = Piscina.isWorkerThread;
+export const workerData = Piscina.workerData;
+
+export {
+  Piscina,
+  kTransferable as transferableSymbol,
+  kValue as valueSymbol,
+  kQueueOptions as queueOptionsSymbol,
+  version
+};

src/main.ts

@@ -0,0 +1,4 @@
+import Piscina from './index';
+
+// Used as the require() entry point to maintain existing behavior
+export = Piscina;

test/fixtures/simple-isworkerthread-named-import.ts

@@ -0,0 +1,6 @@
+import { isWorkerThread } from '../..';
+import assert from 'assert';
+
+assert.strictEqual(isWorkerThread, true);
+
+export default function () { return 'done'; }

test/fixtures/simple-workerdata-named-import.ts

@@ -0,0 +1,6 @@
+import { workerData } from '../..';
+import assert from 'assert';
+
+assert.strictEqual(workerData, 'ABC');
+
+export default function () { return 'done'; }

test/simple-test.ts

@@ -25,6 +25,14 @@ test('Piscina.isWorkerThread has the correct value (worker)', async ({ equal })
   equal(result, 'done');
 });
 
+test('Piscina.isWorkerThread has the correct value (worker) with named import', async ({ equal }) => {
+  const worker = new Piscina({
+    filename: resolve(__dirname, 'fixtures/simple-isworkerthread-named-import.ts')
+  });
+  const result = await worker.runTask(null);
+  equal(result, 'done');
+});
+
 test('Piscina instance is an EventEmitter', async ({ ok }) => {
   const piscina = new Piscina();
   ok(piscina instanceof EventEmitter);
@@ -120,6 +128,16 @@ test('passing valid workerData works', async ({ equal }) => {
   await pool.runTask(null);
 });
 
+test('passing valid workerData works with named import', async ({ equal }) => {
+  const pool = new Piscina({
+    filename: resolve(__dirname, 'fixtures/simple-workerdata-named-import.ts'),
+    workerData: 'ABC'
+  });
+  equal(Piscina.workerData, undefined);
+
+  await pool.runTask(null);
+});
+
 test('passing invalid workerData does not work', async ({ throws }) => {
   throws(() => new Piscina(({
     filename: resolve(__dirname, 'fixtures/simple-workerdata.ts'),