Switching to lodash's debounce

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "scorm-again",
-  "version": "1.1.4",
+  "version": "1.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -6535,6 +6535,12 @@
       "integrity": "sha1-euMBfpOWIqwxt9fX3LGzTbFpDTU=",
       "dev": true
     },
+    "lodash.debounce": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/lodash.debounce/-/lodash.debounce-4.0.8.tgz",
+      "integrity": "sha1-gteb/zCmfEAF/9XiUVMArZyk168=",
+      "dev": true
+    },
     "lodash.defaults": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/lodash.defaults/-/lodash.defaults-4.2.0.tgz",

package.json

@@ -31,6 +31,7 @@
     "grunt-mocha-test": "^0.13.3",
     "jsdoc": "^3.6.4",
     "jsdoc-babel": "^0.5.0",
+    "lodash.debounce": "^4.0.8",
     "minifyify": "^7.3.5",
     "minimist": "^1.2.5",
     "mocha": "^8.0.1",

src/BaseAPI.js

@@ -4,6 +4,7 @@ import {ValidationError} from './exceptions';
 import ErrorCodes from './constants/error_codes';
 import APIConstants from './constants/api_constants';
 import {unflatten} from './utilities';
+import debounce from 'lodash.debounce';
 
 const global_constants = APIConstants.global;
 const scorm12_error_codes = ErrorCodes.scorm12;
@@ -920,31 +921,6 @@ export default class BaseAPI {
         'The storeData method has not been implemented');
   }
 
-  /**
-   * A debounce function to throttle calls to LMS commit API
-   *
-   * @param {function} func
-   * @param {number} wait
-   * @param {boolean} immediate
-   * @return {function(...[*]=)}
-   * @private
-   */
-  _debounce(func, wait, immediate = false) {
-    let timeout;
-    return function(...args) {
-      const later = () => {
-        timeout = null; // added this to set same behaviour as ES5
-        // eslint-disable-next-line no-invalid-this
-        if (!immediate) func.apply(this, args); // this is called conditionally, just like in the ES5 version
-      };
-      const callNow = immediate && !timeout;
-      clearTimeout(timeout);
-      timeout = setTimeout(later, wait);
-      // eslint-disable-next-line no-invalid-this
-      if (callNow) func.apply(this, args);
-    };
-  }
-
   /**
    * Send the request to the LMS
    * @param {string} url
@@ -952,8 +928,7 @@ export default class BaseAPI {
    * @return {object}
    */
   processHttpRequest(url: String, params) {
-    const debounced = this._debounce(
-        function(url, params, settings, error_codes) {
+    const process = function(url, params, settings, error_codes) {
       const genericError = {
         'result': global_constants.SCORM_FALSE,
         'errorCode': error_codes.GENERAL,
@@ -1014,9 +989,15 @@ export default class BaseAPI {
       }
 
       return result;
-        }, 5000);
+    };
+
+    if (typeof debounce !== 'undefined') {
+      const debounced = debounce(process, 5000);
 
       return debounced(url, params, this.settings, this.error_codes);
+    } else {
+      return process(url, params, this.settings, this.error_codes);
+    }
   }
 
   /**