feat: provide an ESM build with and without debug

See also: socketio/engine.io-client@00d7e7d

Related:

- #1188
- #1378

lib/index.ts

@@ -1,19 +1,14 @@
-import { url } from "./url";
-import { Manager, ManagerOptions } from "./manager";
-import { Socket, SocketOptions } from "./socket";
+import { url } from "./url.js";
+import { Manager, ManagerOptions } from "./manager.js";
+import { Socket, SocketOptions } from "./socket.js";
+import debugModule from "debug"; // debug()
 
-const debug = require("debug")("socket.io-client");
-
-/**
- * Module exports.
- */
-
-module.exports = exports = lookup;
+const debug = debugModule("socket.io-client"); // debug()
 
 /**
  * Managers cache.
  */
-const cache: Record<string, Manager> = (exports.managers = {});
+const cache: Record<string, Manager> = {};
 
 /**
  * Looks up an existing `Manager` for multiplexing.
@@ -84,22 +79,17 @@ function lookup(
 
 export { protocol } from "socket.io-parser";
 
-/**
- * `connect`.
- *
- * @param {String} uri
- * @public
- */
-
-exports.connect = lookup;
-
 /**
  * Expose constructors for standalone build.
  *
  * @public
  */
 
-export { Manager, ManagerOptions } from "./manager";
-export { Socket } from "./socket";
-export { lookup as io, SocketOptions };
-export default lookup;
+export {
+  Manager,
+  ManagerOptions,
+  Socket,
+  SocketOptions,
+  lookup as io,
+  lookup as connect,
+};

lib/manager.ts

@@ -3,18 +3,19 @@ import {
   SocketOptions as EngineOptions,
   installTimerFunctions,
 } from "engine.io-client";
-import { Socket, SocketOptions } from "./socket";
+import { Socket, SocketOptions } from "./socket.js";
 import * as parser from "socket.io-parser";
 import { Decoder, Encoder, Packet } from "socket.io-parser";
-import { on } from "./on";
-import * as Backoff from "backo2";
+import { on } from "./on.js";
+import Backoff from "backo2";
 import {
   DefaultEventsMap,
   EventsMap,
   StrictEventEmitter,
-} from "./typed-events";
+} from "./typed-events.js";
+import debugModule from "debug"; // debug()
 
-const debug = require("debug")("socket.io-client:manager");
+const debug = debugModule("socket.io-client:manager"); // debug()
 
 export interface ManagerOptions extends EngineOptions {
   /**

lib/on.ts

@@ -1,5 +1,5 @@
 import type * as Emitter from "component-emitter";
-import { StrictEventEmitter } from "./typed-events";
+import { StrictEventEmitter } from "./typed-events.js";
 
 export function on(
   obj: Emitter | StrictEventEmitter<any, any>,

lib/socket.ts

@@ -1,15 +1,16 @@
 import { Packet, PacketType } from "socket.io-parser";
-import { on } from "./on";
-import { Manager } from "./manager";
+import { on } from "./on.js";
+import { Manager } from "./manager.js";
 import {
   DefaultEventsMap,
   EventNames,
   EventParams,
   EventsMap,
   StrictEventEmitter,
-} from "./typed-events";
+} from "./typed-events.js";
+import debugModule from "debug"; // debug()
 
-const debug = require("debug")("socket.io-client:socket");
+const debug = debugModule("socket.io-client:socket"); // debug()
 
 export interface SocketOptions {
   /**

lib/url.ts

@@ -1,6 +1,7 @@
-import * as parseuri from "parseuri";
+import parseuri from "parseuri";
+import debugModule from "debug"; // debug()
 
-const debug = require("debug")("socket.io-client:url");
+const debug = debugModule("socket.io-client:url"); // debug()
 
 type ParsedUrl = {
   source: string;

package.json

@@ -11,21 +11,24 @@
   ],
   "files": [
     "dist/",
-    "build/",
-    "wrapper.mjs"
+    "build/"
   ],
   "type": "commonjs",
-  "main": "./build/index.js",
+  "main": "./build/cjs/index.js",
+  "module": "./build/esm/index.js",
   "exports": {
     "./package.json": "./package.json",
     "./dist/socket.io.js": "./dist/socket.io.js",
     "./dist/socket.io.js.map": "./dist/socket.io.js.map",
     ".": {
-      "import": "./wrapper.mjs",
-      "require": "./build/index.js"
+      "import": {
+        "node": "./build/esm-debug/index.js",
+        "default": "./build/esm/index.js"
+      },
+      "require": "./build/cjs/index.js"
     }
   },
-  "types": "./build/index.d.ts",
+  "types": "./build/esm/index.d.ts",
   "dependencies": {
     "@socket.io/component-emitter": "~2.0.0",
     "backo2": "~1.0.2",
@@ -68,7 +71,7 @@
     "zuul-ngrok": "4.0.0"
   },
   "scripts": {
-    "compile": "rimraf ./build && tsc",
+    "compile": "rimraf ./build && tsc && tsc -p tsconfig.esm.json && ./postcompile.sh",
     "test": "npm run format:check && npm run compile && if test \"$BROWSERS\" = \"1\" ; then npm run test:browser; else npm run test:node; fi",
     "test:node": "mocha --require ts-node/register --reporter dot --require test/support/server.js test/index.js",
     "test:browser": "zuul test/index.js",

postcompile.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+cp ./support/package.cjs.json ./build/cjs/package.json
+cp ./support/package.esm.json ./build/esm/package.json
+
+cp -r ./build/esm/ ./build/esm-debug/
+
+sed -i '/debug(/d' ./build/esm/*.js

support/package.cjs.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

support/package.esm.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

support/webpack.config.js

@@ -6,7 +6,7 @@ const banner = `Socket.IO v${version}
 Released under the MIT License.`;
 
 module.exports = {
-  entry: "./build/index.js",
+  entry: "./build/esm/index.js",
   output: {
     filename: "socket.io.js",
     library: "io",

test/connection.ts

@@ -1,9 +1,9 @@
-import * as expect from "expect.js";
+import expect from "expect.js";
 import { io, Manager, ManagerOptions } from "..";
-import * as hasCORS from "has-cors";
-import * as FakeTimers from "@sinonjs/fake-timers";
-import * as textBlobBuilder from "text-blob-builder";
-import * as env from "./support/env";
+import hasCORS from "has-cors";
+import FakeTimers from "@sinonjs/fake-timers";
+import textBlobBuilder from "text-blob-builder";
+import env from "./support/env";
 
 describe("connection", function () {
   this.timeout(70000);

test/fixtures/no-unref.ts

@@ -1,4 +1,4 @@
-const io = require("../..");
+const { io } = require("../..");
 const socket = io("http://localhost:3211", {
   autoUnref: false,
 });

test/fixtures/unref-during-reconnection.ts

@@ -1,4 +1,4 @@
-const io = require("../..");
+const { io } = require("../..");
 const socket = io("http://localhost:3211", {
   autoUnref: true,
 });

test/fixtures/unref-polling-only.ts

@@ -1,4 +1,4 @@
-const io = require("../..");
+const { io } = require("../..");
 const socket = io("http://localhost:3210", {
   autoUnref: true,
   transports: ["polling"],

test/fixtures/unref-websocket-only.ts

@@ -1,4 +1,4 @@
-const io = require("../..");
+const { io } = require("../..");
 const socket = io("http://localhost:3210", {
   autoUnref: true,
   transports: ["websocket"],

test/fixtures/unref.ts

@@ -1,4 +1,4 @@
-const io = require("../..");
+const { io } = require("../..");
 const socket = io("http://localhost:3210", {
   autoUnref: true,
 });

test/socket.ts

@@ -1,4 +1,4 @@
-import * as expect from "expect.js";
+import expect from "expect.js";
 import { io } from "..";
 
 describe("socket", function () {

test/url.ts

@@ -1,5 +1,5 @@
-import { url } from "../build/url";
-import * as expect from "expect.js";
+import { url } from "../build/cjs/url";
+import expect from "expect.js";
 
 const loc: any = {};
 

tsconfig.esm.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "outDir": "build/esm/",
+    "target": "es2018",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "declaration": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}

tsconfig.json

@@ -1,10 +1,10 @@
 {
   "compilerOptions": {
-    "outDir": "./build",
-    "allowJs": false,
-    "target": "es2017",
+    "outDir": "build/cjs/",
+    "target": "es2018", // Node.js 10 (https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping)
     "module": "commonjs",
-    "declaration": true
+    "declaration": false,
+    "esModuleInterop": true
   },
   "include": [
     "./lib/**/*"