Fix Javascript warnings and type definition gaps

lib/sse.js

@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2016-2023 Maxime Petazzoni <maxime.petazzoni@bulix.org>.
+ * Copyright (C) 2016-2024 Maxime Petazzoni <maxime.petazzoni@bulix.org>.
  * All rights reserved.
  */
 
@@ -37,7 +37,7 @@ var SSE = function (url, options) {
   /** @type {string} */
   this.FIELD_SEPARATOR = ':';
 
-  /** @type { {[key: string]: EventListener} } */
+  /** @type { {[key: string]: [EventListener]} } */
   this.listeners = {};
 
   /** @type {XMLHttpRequest} */
@@ -70,7 +70,7 @@ var SSE = function (url, options) {
       return;
     }
 
-    var filtered = [];
+    const filtered = [];
     this.listeners[type].forEach(function(element) {
       if (element !== listener) {
         filtered.push(element);
@@ -97,7 +97,7 @@ var SSE = function (url, options) {
 
     e.source = this;
 
-    var onHandler = 'on' + e.type;
+    const onHandler = 'on' + e.type;
     if (this.hasOwnProperty(onHandler)) {
       this[onHandler].call(this, e);
       if (e.defaultPrevented) {
@@ -117,20 +117,20 @@ var SSE = function (url, options) {
 
   /** @private */
   this._setReadyState = function(state) {
-    var event = new CustomEvent('readystatechange');
+    const event = new CustomEvent('readystatechange');
     event.readyState = state;
     this.readyState = state;
     this.dispatchEvent(event);
   };
 
   this._onStreamFailure = function(e) {
-    var event = new CustomEvent('error');
+    const event = new CustomEvent('error');
     event.data = e.currentTarget.response;
     this.dispatchEvent(event);
     this.close();
   }
 
-  this._onStreamAbort = function(e) {
+  this._onStreamAbort = function() {
     this.dispatchEvent(new CustomEvent('abort'));
     this.close();
   }
@@ -146,19 +146,21 @@ var SSE = function (url, options) {
       return;
     }
 
-    if (this.readyState == this.CONNECTING) {
+    if (this.readyState === this.CONNECTING) {
       this.dispatchEvent(new CustomEvent('open'));
       this._setReadyState(this.OPEN);
     }
 
-    var data = this.xhr.responseText.substring(this.progress);
+    const data = this.xhr.responseText.substring(this.progress);
 
     this.progress += data.length;
-    var parts = (this.chunk + data).split(/(\r\n\r\n|\r\r|\n\n)/g);
+    const parts = (this.chunk + data).split(/(\r\n\r\n|\r\r|\n\n)/g);
 
-    // we assume that the last chunk can be incomplete because of buffering or other network effects
-    // so we always save the last part to merge it with the next incoming packet
-    var lastPart = parts.pop();
+    /*
+     * We assume that the last chunk can be incomplete because of buffering or other network effects,
+     * so we always save the last part to merge it with the next incoming packet
+     */
+    const lastPart = parts.pop();
     parts.forEach(function(part) {
         if (part.trim().length > 0) {
             this.dispatchEvent(this._parseEventChunk(part));
@@ -190,13 +192,13 @@ var SSE = function (url, options) {
       console.debug(chunk);
     }
 
-    var e = {'id': null, 'retry': null, 'data': null, 'event': null};
+    const e = {'id': null, 'retry': null, 'data': null, 'event': null};
     chunk.split(/\n|\r\n|\r/).forEach(function(line) {
-      var index = line.indexOf(this.FIELD_SEPARATOR);
-      var field, value;
+      const index = line.indexOf(this.FIELD_SEPARATOR);
+      let field, value;
       if (index > 0) {
         // only first whitespace should be trimmed
-        var skip = (line[index+1] === ' ') ? 2 : 1;
+        const skip = (line[index + 1] === ' ') ? 2 : 1;
         field = line.substring(0, index);
         value = line.substring(index + skip);
       } else if (index < 0) {
@@ -256,7 +258,7 @@ var SSE = function (url, options) {
     this.xhr.addEventListener('error', this._onStreamFailure.bind(this));
     this.xhr.addEventListener('abort', this._onStreamAbort.bind(this));
     this.xhr.open(this.method, this.url);
-    for (var header in this.headers) {
+    for (let header in this.headers) {
       this.xhr.setRequestHeader(header, this.headers[header]);
     }
     this.xhr.withCredentials = this.withCredentials;
@@ -300,6 +302,7 @@ export { SSE };
  * @property {string} [payload] - payload as a string
  * @property {string} [method] - HTTP Method
  * @property {boolean} [withCredentials] - flag, if credentials needed
+ * @property {boolean} [start] - flag, if streaming should start automatically
  * @property {boolean} [debug] - debugging flag
  */
 /**