replace event-emitter package with NodeJS builtin events

package.json

@@ -58,7 +58,6 @@
     "@types/localforage": "0.0.34",
     "@xmldom/xmldom": "^0.7.5",
     "core-js": "^3.18.3",
-    "event-emitter": "^0.3.5",
     "jszip": "^3.7.1",
     "localforage": "^1.10.0",
     "lodash": "^4.17.21",

src/annotations.js

@@ -1,4 +1,4 @@
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import EpubCFI from "./epubcfi";
 import { EVENTS } from "./utils/constants";
 
@@ -212,7 +212,7 @@ class Annotations {
  * @param {object} styles CSS styles to assign to annotation
  * @returns {Annotation} annotation
  */
-class Annotation {
+class Annotation extends EventEmitter {
 
 	constructor ({
 		type,
@@ -223,6 +223,7 @@ class Annotation {
 		className,
 		styles
 	}) {
+		super();
 		this.type = type;
 		this.cfiRange = cfiRange;
 		this.data = data;
@@ -295,7 +296,7 @@ class Annotation {
 
 }
 
-EventEmitter(Annotation.prototype);
+Object.assign(Annotation.prototype, EventEmitter.prototype);
 
 
 export default Annotations

src/book.js

@@ -1,4 +1,4 @@
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import {extend, defer} from "./utils/core";
 import Url from "./utils/url";
 import Path from "./utils/path";
@@ -47,8 +47,9 @@ const INPUT_TYPE = {
  * @example new Book("/path/to/book.epub", {})
  * @example new Book({ replacements: "blobUrl" })
  */
-class Book {
+class Book extends EventEmitter {
 	constructor(url, options) {
+		super();
 		// Allow passing just options to the Book
 		if (typeof(options) === "undefined" &&
 			  typeof(url) !== "string" &&
@@ -763,6 +764,6 @@ class Book {
 }
 
 //-- Enable binding events to book
-EventEmitter(Book.prototype);
+Object.assign(Book.prototype, EventEmitter.prototype);
 
 export default Book;

src/contents.js

@@ -1,4 +1,4 @@
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import {isNumber, prefixed, borders, defaults} from "./utils/core";
 import EpubCFI from "./epubcfi";
 import Mapping from "./mapping";
@@ -21,8 +21,9 @@ const TEXT_NODE = 3;
 	* @param {string} cfiBase Section component of CFIs
 	* @param {number} sectionIndex Index in Spine of Conntent's Section
 	*/
-class Contents {
+class Contents extends EventEmitter {
 	constructor(doc, content, cfiBase, sectionIndex) {
+		super();
 		// Blank Cfi for Parsing
 		this.epubcfi = new EpubCFI();
 
@@ -1259,6 +1260,6 @@ class Contents {
 	}
 }
 
-EventEmitter(Contents.prototype);
+Object.assign(Contents.prototype, EventEmitter.prototype);
 
 export default Contents;

src/layout.js

@@ -1,6 +1,6 @@
 import { extend } from "./utils/core";
 import { EVENTS } from "./utils/constants";
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 
 /**
  * Figures out the CSS values to apply for a layout
@@ -11,8 +11,9 @@ import EventEmitter from "event-emitter";
  * @param {number} [settings.minSpreadWidth=800]
  * @param {boolean} [settings.evenSpreads=false]
  */
-class Layout {
+class Layout extends EventEmitter {
 	constructor(settings) {
+		super();
 		this.settings = settings;
 		this.name = settings.layout || "reflowable";
 		this._spread = (settings.spread === "none") ? false : true;
@@ -255,6 +256,6 @@ class Layout {
 	}
 }
 
-EventEmitter(Layout.prototype);
+Object.assign(Layout.prototype, EventEmitter.prototype);
 
 export default Layout;

src/locations.js

@@ -2,16 +2,17 @@ import {qs, sprint, locationOf, defer} from "./utils/core";
 import Queue from "./utils/queue";
 import EpubCFI from "./epubcfi";
 import { EVENTS } from "./utils/constants";
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 
 /**
  * Find Locations for a Book
  * @param {Spine} spine
  * @param {request} request
  * @param {number} [pause=100]
  */
-class Locations {
+class Locations extends EventEmitter {
 	constructor(spine, request, pause) {
+		super();
 		this.spine = spine;
 		this.request = request;
 		this.pause = pause || 100;
@@ -496,6 +497,6 @@ class Locations {
 	}
 }
 
-EventEmitter(Locations.prototype);
+Object.assign(Locations.prototype, EventEmitter.prototype); // Bind EventEmitter methods to Locations
 
 export default Locations;

src/managers/default/index.js

@@ -1,4 +1,4 @@
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import {extend, defer, windowBounds, isNumber} from "../../utils/core";
 import scrollType from "../../utils/scrolltype";
 import Mapping from "../../mapping";
@@ -7,8 +7,9 @@ import Stage from "../helpers/stage";
 import Views from "../helpers/views";
 import { EVENTS } from "../../utils/constants";
 
-class DefaultViewManager {
+class DefaultViewManager extends EventEmitter {
 	constructor(options) {
+		super();
 
 		this.name = "default";
 		this.optsSettings = options.settings;
@@ -1072,6 +1073,6 @@ class DefaultViewManager {
 }
 
 //-- Enable binding events to Manager
-EventEmitter(DefaultViewManager.prototype);
+Object.assign(DefaultViewManager.prototype, EventEmitter.prototype);
 
 export default DefaultViewManager;

src/managers/helpers/snap.js

@@ -1,6 +1,6 @@
 import {extend, defer, requestAnimationFrame, prefixed} from "../../utils/core";
 import { EVENTS, DOM_EVENTS } from "../../utils/constants";
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 
 // easing equations from https://github.com/danro/easing-js/blob/master/easing.js
 const PI_D2 = (Math.PI / 2);
@@ -22,8 +22,9 @@ const EASING_EQUATIONS = {
   	}
 };
 
-class Snap {
+class Snap extends EventEmitter {
 	constructor(manager, options) {
+		super();
 
 		this.settings = extend({
 			duration: 80,
@@ -333,6 +334,6 @@ class Snap {
 	}
 }
 
-EventEmitter(Snap.prototype);
+Object.assign(Snap.prototype, EventEmitter.prototype);
 
 export default Snap;

src/managers/views/iframe.js

@@ -1,12 +1,13 @@
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import {extend, borders, uuid, isNumber, bounds, defer, createBlobUrl, revokeBlobUrl} from "../../utils/core";
 import EpubCFI from "../../epubcfi";
 import Contents from "../../contents";
 import { EVENTS } from "../../utils/constants";
 import { Pane, Highlight, Underline } from "marks-pane";
 
-class IframeView {
+class IframeView extends EventEmitter {
 	constructor(section, options) {
+		super();
 		this.settings = extend({
 			ignoreClass : "",
 			axis: undefined, //options.layout && options.layout.props.flow === "scrolled" ? "vertical" : "horizontal",
@@ -846,6 +847,6 @@ class IframeView {
 	}
 }
 
-EventEmitter(IframeView.prototype);
+Object.assign(IframeView.prototype, EventEmitter.prototype);
 
 export default IframeView;

src/rendition.js

@@ -1,4 +1,4 @@
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import { extend, defer, isFloat } from "./utils/core";
 import Hook from "./utils/hook";
 import EpubCFI from "./epubcfi";
@@ -40,8 +40,9 @@ import ContinuousViewManager from "./managers/continuous/index";
  * @param {boolean} [options.allowScriptedContent=false] enable running scripts in content
  * @param {boolean} [options.allowPopups=false] enable opening popup in content
  */
-class Rendition {
+class Rendition extends EventEmitter {
 	constructor(book, options) {
+		super();
 
 		this.settings = extend(this.settings || {}, {
 			width: null,
@@ -1064,6 +1065,6 @@ class Rendition {
 }
 
 //-- Enable binding events to Renderer
-EventEmitter(Rendition.prototype);
+Object.assign(Rendition.prototype, EventEmitter.prototype);
 
 export default Rendition;

src/store.js

@@ -2,7 +2,7 @@ import {defer, isXml, parse} from "./utils/core";
 import httpRequest from "./utils/request";
 import mime from "./utils/mime";
 import Path from "./utils/path";
-import EventEmitter from "event-emitter";
+import { EventEmitter } from "events";
 import localforage from "localforage";
 
 /**
@@ -12,9 +12,10 @@ import localforage from "localforage";
  * @param {function} [requester]
  * @param {function} [resolver]
  */
-class Store {
+class Store extends EventEmitter {
 
 	constructor(name, requester, resolver) {
+		super();
 		this.urlCache = {};
 
 		this.storage = undefined;
@@ -379,6 +380,6 @@ class Store {
 	}
 }
 
-EventEmitter(Store.prototype);
+Object.assign(Store.prototype, EventEmitter.prototype);
 
 export default Store;