diff --git a/src/components/views/elements/ResizeHandle.js b/src/components/views/elements/ResizeHandle.js
index ae324a752b..4c09278f84 100644
--- a/src/components/views/elements/ResizeHandle.js
+++ b/src/components/views/elements/ResizeHandle.js
@@ -14,7 +14,7 @@ const ResizeHandle = (props) => {
         classNames.push('mx_ResizeHandle_reverse');
     }
     return (
-        <div className={classNames.join(' ')}/>
+        <div className={classNames.join(' ')} />
     );
 };
 
diff --git a/src/resizer/distributors.js b/src/resizer/distributors.js
index 93a75d474e..a5ef48e571 100644
--- a/src/resizer/distributors.js
+++ b/src/resizer/distributors.js
@@ -46,15 +46,14 @@ class CollapseDistributor extends FixedDistributor {
     }
 
     resize(offset) {
-        let newSize = this.sizeFromOffset(offset);
+        const newSize = this.sizeFromOffset(offset);
         const isCollapsedSize = newSize < this.toggleSize;
         if (isCollapsedSize && !this.isCollapsed) {
             this.isCollapsed = true;
             if (this.onCollapsed) {
                 this.onCollapsed(true, this.item);
             }
-        }
-        else if (!isCollapsedSize && this.isCollapsed) {
+        } else if (!isCollapsedSize && this.isCollapsed) {
             if (this.onCollapsed) {
                 this.onCollapsed(false, this.item);
             }
diff --git a/src/resizer/resizer.js b/src/resizer/resizer.js
index 8888287b86..10f08aa546 100644
--- a/src/resizer/resizer.js
+++ b/src/resizer/resizer.js
@@ -101,6 +101,7 @@ export class Resizer {
         const vertical = resizeHandle.classList.contains(this.classNames.vertical);
         const reverse = resizeHandle.classList.contains(this.classNames.reverse);
 
+        // eslint-disable-next-line new-cap
         const sizer = new this.sizerCtor(this.container, vertical, reverse);
 
         const items = this._getResizableItems();
@@ -108,6 +109,7 @@ export class Resizer {
         // if reverse, resize the item after the handle instead of before, so + 1
         const itemIndex = items.indexOf(prevItem) + (reverse ? 1 : 0);
         const item = items[itemIndex];
+        // eslint-disable-next-line new-cap
         const distributor = new this.distributorCtor(
             sizer, item, this.distributorCfg,
             items, this.container);
diff --git a/src/resizer/sizer.js b/src/resizer/sizer.js
index b39aaea286..674ea1823c 100644
--- a/src/resizer/sizer.js
+++ b/src/resizer/sizer.js
@@ -39,7 +39,10 @@ class Sizer {
         item.style.flexGrow = Math.round(percent * 1000);
     }
 
-    /** returns how far the edge of the item is from the edge of the container */
+    /**
+        @param {Element} item the dom element being resized
+        @return {number} how far the edge of the item is from the edge of the container
+    */
     getItemOffset(item) {
         const offset = (this.vertical ? item.offsetTop : item.offsetLeft) - this._getOffset();
         if (this.reverse) {
@@ -49,17 +52,20 @@ class Sizer {
         }
     }
 
-    /** returns the width/height of an item in the container */
+    /**
+        @param {Element} item the dom element being resized
+        @return {number} the width/height of an item in the container
+    */
     getItemSize(item) {
         return this.vertical ? item.offsetHeight : item.offsetWidth;
     }
 
-    /** returns the width/height of the container */
+    /** @return {number} the width/height of the container */
     getTotalSize() {
         return this.vertical ? this.container.offsetHeight : this.container.offsetWidth;
     }
 
-    /** container offset to offsetParent */
+    /** @return {number} container offset to offsetParent */
     _getOffset() {
         return this.vertical ? this.container.offsetTop : this.container.offsetLeft;
     }
@@ -72,7 +78,11 @@ class Sizer {
         }
     }
 
-    /** returns the position of cursor at event relative to the edge of the container */
+    /**
+        @param {MouseEvent} event the mouse event
+        @return {number} the distance between the cursor and the edge of the container,
+            along the applicable axis (vertical or horizontal)
+    */
     offsetFromEvent(event) {
         const pos = this.vertical ? event.pageY : event.pageX;
         if (this.reverse) {