diff --git a/src/ol/render/webgl/BatchRenderer.js b/src/ol/render/webgl/BatchRenderer.js
index 406ac8c7f2..a19dff4360 100644
--- a/src/ol/render/webgl/BatchRenderer.js
+++ b/src/ol/render/webgl/BatchRenderer.js
@@ -2,13 +2,13 @@
  * @module ol/render/webgl/BatchRenderer
  */
 import GeometryType from '../../geom/GeometryType.js';
+import {WebGLWorkerMessageType} from './constants.js';
+import {abstract} from '../../util.js';
 import {
   create as createTransform,
   makeInverse as makeInverseTransform,
   multiply as multiplyTransform,
 } from '../../transform.js';
-import {abstract} from '../../util.js';
-import {WebGLWorkerMessageType} from './constants.js';
 
 /**
  * @typedef {Object} CustomAttribute A description of a custom attribute to be passed on to the GPU, with a value different
@@ -27,11 +27,11 @@ let workerMessageCounter = 0;
  */
 class AbstractBatchRenderer {
   /**
-   * @param {import("../../webgl/Helper.js").default} helper
-   * @param {Worker} worker
-   * @param {string} vertexShader
-   * @param {string} fragmentShader
-   * @param {Array<CustomAttribute>} customAttributes
+   * @param {import("../../webgl/Helper.js").default} helper WebGL helper instance
+   * @param {Worker} worker WebGL worker instance
+   * @param {string} vertexShader Vertex shader
+   * @param {string} fragmentShader Fragment shader
+   * @param {Array<CustomAttribute>} customAttributes List of custom attributes
    */
   constructor(helper, worker, vertexShader, fragmentShader, customAttributes) {
     /**
@@ -69,9 +69,9 @@ class AbstractBatchRenderer {
   /**
    * Rebuild rendering instructions and webgl buffers based on the provided frame state
    * Note: this is a costly operation.
-   * @param {import("./MixedGeometryBatch.js").AbstractGeometryBatch} batch
+   * @param {import("./MixedGeometryBatch.js").GeometryBatch} batch Geometry batch
    * @param {import("../../PluggableMap").FrameState} frameState Frame state.
-   * @param {import("../../geom/GeometryType.js").default} geometryType
+   * @param {import("../../geom/GeometryType.js").default} geometryType Geometry type
    */
   rebuild(batch, frameState, geometryType) {
     // store transform for rendering instructions
@@ -86,12 +86,13 @@ class AbstractBatchRenderer {
   /**
    * Render the geometries in the batch. This will also update the current transform used for rendering according to
    * the invert transform of the webgl buffers
-   * @param {import("./MixedGeometryBatch.js").AbstractGeometryBatch} batch
-   * @param {import("../../transform.js").Transform} currentTransform
+   * @param {import("./MixedGeometryBatch.js").GeometryBatch} batch Geometry batch
+   * @param {import("../../transform.js").Transform} currentTransform Transform
    * @param {import("../../PluggableMap.js").FrameState} frameState Frame state.
    */
   render(batch, currentTransform, frameState) {
     // multiply the current projection transform with the invert of the one used to fill buffers
+    // FIXME: this should probably be done directly in the layer renderer
     this.helper_.makeProjectionTransform(frameState, currentTransform);
     multiplyTransform(currentTransform, batch.invertVerticesBufferTransform);
 
@@ -108,7 +109,7 @@ class AbstractBatchRenderer {
   /**
    * Rebuild rendering instructions based on the provided frame state
    * This is specific to the geometry type and has to be implemented by subclasses.
-   * @param {import("./MixedGeometryBatch.js").default} batch
+   * @param {import("./MixedGeometryBatch.js").GeometryBatch} batch Geometry batch
    * @protected
    */
   generateRenderInstructions_(batch) {
@@ -118,8 +119,8 @@ class AbstractBatchRenderer {
   /**
    * Rebuild internal webgl buffers for rendering based on the current rendering instructions;
    * This is asynchronous: webgl buffers wil _not_ be updated right away
-   * @param {import("./MixedGeometryBatch.js").AbstractGeometryBatch} batch
-   * @param {import("../../geom/GeometryType.js").default} geometryType
+   * @param {import("./MixedGeometryBatch.js").GeometryBatch} batch Geometry batch
+   * @param {import("../../geom/GeometryType.js").default} geometryType Geometry type
    * @protected
    */
   generateBuffers_(batch, geometryType) {
@@ -136,6 +137,8 @@ class AbstractBatchRenderer {
       case GeometryType.LINE_STRING:
         messageType = WebGLWorkerMessageType.GENERATE_LINE_STRING_BUFFERS;
         break;
+      default:
+      // pass
     }
 
     /** @type {import('./constants.js').WebGLWorkerGenerateBuffersMessage} */
diff --git a/src/ol/render/webgl/LineStringBatchRenderer.js b/src/ol/render/webgl/LineStringBatchRenderer.js
index 31ef0e4e6a..3c5e1509d6 100644
--- a/src/ol/render/webgl/LineStringBatchRenderer.js
+++ b/src/ol/render/webgl/LineStringBatchRenderer.js
@@ -1,17 +1,17 @@
 /**
  * @module ol/render/webgl/LineStringBatchRenderer
  */
+import AbstractBatchRenderer from './BatchRenderer.js';
 import {AttributeType} from '../../webgl/Helper.js';
 import {transform2D} from '../../geom/flat/transform.js';
-import AbstractBatchRenderer from './BatchRenderer.js';
 
 class LineStringBatchRenderer extends AbstractBatchRenderer {
   /**
-   * @param {import("../../webgl/Helper.js").default} helper
-   * @param {Worker} worker
-   * @param {string} vertexShader
-   * @param {string} fragmentShader
-   * @param {Array<import('./BatchRenderer.js').CustomAttribute>} customAttributes
+   * @param {import("../../webgl/Helper.js").default} helper WebGL helper instance
+   * @param {Worker} worker WebGL worker instance
+   * @param {string} vertexShader Vertex shader
+   * @param {string} fragmentShader Fragment shader
+   * @param {Array<import('./BatchRenderer.js').CustomAttribute>} customAttributes List of custom attributes
    */
   constructor(helper, worker, vertexShader, fragmentShader, customAttributes) {
     super(helper, worker, vertexShader, fragmentShader, customAttributes);
@@ -47,7 +47,7 @@ class LineStringBatchRenderer extends AbstractBatchRenderer {
   /**
    * Render instructions for lines are structured like so:
    * [ customAttr0, ... , customAttrN, numberOfVertices0, x0, y0, ... , xN, yN, numberOfVertices1, ... ]
-   * @param {import("./MixedGeometryBatch.js").PointGeometryBatch} batch
+   * @param {import("./MixedGeometryBatch.js").LineStringGeometryBatch} batch Linestring geometry batch
    * @override
    */
   generateRenderInstructions_(batch) {
diff --git a/src/ol/render/webgl/MixedGeometryBatch.js b/src/ol/render/webgl/MixedGeometryBatch.js
index c0270657c1..dc144bf26e 100644
--- a/src/ol/render/webgl/MixedGeometryBatch.js
+++ b/src/ol/render/webgl/MixedGeometryBatch.js
@@ -1,11 +1,11 @@
 /**
  * @module ol/render/webgl/MixedGeometryBatch
  */
-import {getUid} from '../../util.js';
 import GeometryType from '../../geom/GeometryType.js';
 import WebGLArrayBuffer from '../../webgl/Buffer.js';
 import {ARRAY_BUFFER, DYNAMIC_DRAW, ELEMENT_ARRAY_BUFFER} from '../../webgl.js';
 import {create as createTransform} from '../../transform.js';
+import {getUid} from '../../util.js';
 
 /**
  * @typedef {Object} GeometryBatchItem Object that holds a reference to a feature as well as the raw coordinates of its various geometries
@@ -18,36 +18,52 @@ import {create as createTransform} from '../../transform.js';
  */
 
 /**
- * @typedef {Object} AbstractGeometryBatch
- * @abstract
+ * @typedef {PointGeometryBatch|LineStringGeometryBatch|PolygonGeometryBatch} GeometryBatch
+ */
+
+/**
+ * @typedef {Object} PolygonGeometryBatch A geometry batch specific to polygons
  * @property {Object<string, GeometryBatchItem>} entries Dictionary of all entries in the batch with associated computed values.
  * One entry corresponds to one feature. Key is feature uid.
  * @property {number} geometriesCount Amount of geometries in the batch.
  * @property {Float32Array} renderInstructions Render instructions for polygons are structured like so:
  * [ numberOfRings, numberOfVerticesInRing0, ..., numberOfVerticesInRingN, x0, y0, customAttr0, ..., xN, yN, customAttrN, numberOfRings,... ]
- * @property {WebGLArrayBuffer} verticesBuffer
- * @property {WebGLArrayBuffer} indicesBuffer
+ * @property {WebGLArrayBuffer} verticesBuffer Vertices WebGL buffer
+ * @property {WebGLArrayBuffer} indicesBuffer Indices WebGL buffer
  * @property {import("../../transform.js").Transform} renderInstructionsTransform Converts world space coordinates to screen space; applies to the rendering instructions
  * @property {import("../../transform.js").Transform} verticesBufferTransform Converts world space coordinates to screen space; applies to the webgl vertices buffer
  * @property {import("../../transform.js").Transform} invertVerticesBufferTransform Screen space to world space; applies to the webgl vertices buffer
- */
-
-/**
- * @typedef {Object} PolygonGeometryBatch A geometry batch specific to polygons
- * @extends {AbstractGeometryBatch}
  * @property {number} verticesCount Amount of vertices from geometries in the batch.
  * @property {number} ringsCount How many outer and inner rings in this batch.
  */
 
 /**
  * @typedef {Object} LineStringGeometryBatch A geometry batch specific to lines
- * @extends {AbstractGeometryBatch}
+ * @property {Object<string, GeometryBatchItem>} entries Dictionary of all entries in the batch with associated computed values.
+ * One entry corresponds to one feature. Key is feature uid.
+ * @property {number} geometriesCount Amount of geometries in the batch.
+ * @property {Float32Array} renderInstructions Render instructions for polygons are structured like so:
+ * [ numberOfRings, numberOfVerticesInRing0, ..., numberOfVerticesInRingN, x0, y0, customAttr0, ..., xN, yN, customAttrN, numberOfRings,... ]
+ * @property {WebGLArrayBuffer} verticesBuffer Vertices WebGL buffer
+ * @property {WebGLArrayBuffer} indicesBuffer Indices WebGL buffer
+ * @property {import("../../transform.js").Transform} renderInstructionsTransform Converts world space coordinates to screen space; applies to the rendering instructions
+ * @property {import("../../transform.js").Transform} verticesBufferTransform Converts world space coordinates to screen space; applies to the webgl vertices buffer
+ * @property {import("../../transform.js").Transform} invertVerticesBufferTransform Screen space to world space; applies to the webgl vertices buffer
  * @property {number} verticesCount Amount of vertices from geometries in the batch.
  */
 
 /**
  * @typedef {Object} PointGeometryBatch A geometry batch specific to points
- * @extends {AbstractGeometryBatch}
+ * @property {Object<string, GeometryBatchItem>} entries Dictionary of all entries in the batch with associated computed values.
+ * One entry corresponds to one feature. Key is feature uid.
+ * @property {number} geometriesCount Amount of geometries in the batch.
+ * @property {Float32Array} renderInstructions Render instructions for polygons are structured like so:
+ * [ numberOfRings, numberOfVerticesInRing0, ..., numberOfVerticesInRingN, x0, y0, customAttr0, ..., xN, yN, customAttrN, numberOfRings,... ]
+ * @property {WebGLArrayBuffer} verticesBuffer Vertices WebGL buffer
+ * @property {WebGLArrayBuffer} indicesBuffer Indices WebGL buffer
+ * @property {import("../../transform.js").Transform} renderInstructionsTransform Converts world space coordinates to screen space; applies to the rendering instructions
+ * @property {import("../../transform.js").Transform} verticesBufferTransform Converts world space coordinates to screen space; applies to the webgl vertices buffer
+ * @property {import("../../transform.js").Transform} invertVerticesBufferTransform Screen space to world space; applies to the webgl vertices buffer
  */
 
 /**
@@ -118,7 +134,7 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default[]} features
+   * @param {Array<import("../../Feature").default>} features Array of features to add to the batch
    */
   addFeatures(features) {
     for (let i = 0; i < features.length; i++) {
@@ -127,7 +143,7 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../Feature").default} feature Feature to add to the batch
    */
   addFeature(feature) {
     const geometry = feature.getGeometry();
@@ -138,8 +154,8 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default} feature
-   * @return {GeometryBatchItem}
+   * @param {import("../../Feature").default} feature Feature
+   * @return {GeometryBatchItem} Batch item added (or existing one)
    * @private
    */
   addFeatureEntryInPointBatch_(feature) {
@@ -155,8 +171,8 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default} feature
-   * @return {GeometryBatchItem}
+   * @param {import("../../Feature").default} feature Feature
+   * @return {GeometryBatchItem} Batch item added (or existing one)
    * @private
    */
   addFeatureEntryInLineStringBatch_(feature) {
@@ -173,8 +189,8 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default} feature
-   * @return {GeometryBatchItem}
+   * @param {import("../../Feature").default} feature Feature
+   * @return {GeometryBatchItem} Batch item added (or existing one)
    * @private
    */
   addFeatureEntryInPolygonBatch_(feature) {
@@ -193,35 +209,41 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../Feature").default} feature Feature
    * @private
    */
   clearFeatureEntryInPointBatch_(feature) {
     const entry = this.pointBatch.entries[getUid(feature)];
-    if (!entry) return;
+    if (!entry) {
+      return;
+    }
     this.pointBatch.geometriesCount -= entry.flatCoordss.length;
     delete this.pointBatch.entries[getUid(feature)];
   }
 
   /**
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../Feature").default} feature Feature
    * @private
    */
   clearFeatureEntryInLineStringBatch_(feature) {
     const entry = this.lineStringBatch.entries[getUid(feature)];
-    if (!entry) return;
+    if (!entry) {
+      return;
+    }
     this.lineStringBatch.verticesCount -= entry.verticesCount;
     this.lineStringBatch.geometriesCount -= entry.flatCoordss.length;
     delete this.lineStringBatch.entries[getUid(feature)];
   }
 
   /**
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../Feature").default} feature Feature
    * @private
    */
   clearFeatureEntryInPolygonBatch_(feature) {
     const entry = this.polygonBatch.entries[getUid(feature)];
-    if (!entry) return;
+    if (!entry) {
+      return;
+    }
     this.polygonBatch.verticesCount -= entry.verticesCount;
     this.polygonBatch.ringsCount -= entry.ringsCount;
     this.polygonBatch.geometriesCount -= entry.flatCoordss.length;
@@ -229,8 +251,8 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../geom").Geometry} geometry
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../geom").Geometry} geometry Geometry
+   * @param {import("../../Feature").default} feature Feature
    * @private
    */
   addGeometry_(geometry, feature) {
@@ -240,29 +262,34 @@ class MixedGeometryBatch {
     let batchEntry;
     switch (type) {
       case GeometryType.GEOMETRY_COLLECTION:
-        geometry
+        /** @type {import("../../geom").GeometryCollection} */ (geometry)
           .getGeometries()
           .map((geom) => this.addGeometry_(geom, feature));
         break;
       case GeometryType.MULTI_POLYGON:
-        geometry
+        /** @type {import("../../geom").MultiPolygon} */ (geometry)
           .getPolygons()
           .map((polygon) => this.addGeometry_(polygon, feature));
         break;
       case GeometryType.MULTI_LINE_STRING:
-        geometry
+        /** @type {import("../../geom").MultiLineString} */ (geometry)
           .getLineStrings()
           .map((line) => this.addGeometry_(line, feature));
         break;
       case GeometryType.MULTI_POINT:
-        geometry.getPoints().map((point) => this.addGeometry_(point, feature));
+        /** @type {import("../../geom").MultiPoint} */ (geometry)
+          .getPoints()
+          .map((point) => this.addGeometry_(point, feature));
         break;
       case GeometryType.POLYGON:
+        const polygonGeom = /** @type {import("../../geom").Polygon} */ (
+          geometry
+        );
         batchEntry = this.addFeatureEntryInPolygonBatch_(feature);
-        flatCoords = geometry.getFlatCoordinates();
+        flatCoords = polygonGeom.getFlatCoordinates();
         verticesCount = flatCoords.length / 2;
-        const ringsCount = geometry.getLinearRingCount();
-        const ringsVerticesCount = geometry
+        const ringsCount = polygonGeom.getLinearRingCount();
+        const ringsVerticesCount = polygonGeom
           .getEnds()
           .map((end, ind, arr) =>
             ind > 0 ? (end - arr[ind - 1]) / 2 : end / 2
@@ -274,31 +301,37 @@ class MixedGeometryBatch {
         batchEntry.ringsVerticesCounts.push(ringsVerticesCount);
         batchEntry.verticesCount += verticesCount;
         batchEntry.ringsCount += ringsCount;
-        geometry
+        polygonGeom
           .getLinearRings()
           .map((ring) => this.addGeometry_(ring, feature));
         break;
       case GeometryType.POINT:
+        const pointGeom = /** @type {import("../../geom").Point} */ (geometry);
         batchEntry = this.addFeatureEntryInPointBatch_(feature);
-        flatCoords = geometry.getFlatCoordinates();
+        flatCoords = pointGeom.getFlatCoordinates();
         this.pointBatch.geometriesCount++;
         batchEntry.flatCoordss.push(flatCoords);
         break;
       case GeometryType.LINE_STRING:
       case GeometryType.LINEAR_RING:
+        const lineGeom = /** @type {import("../../geom").LineString} */ (
+          geometry
+        );
         batchEntry = this.addFeatureEntryInLineStringBatch_(feature);
-        flatCoords = geometry.getFlatCoordinates();
+        flatCoords = lineGeom.getFlatCoordinates();
         verticesCount = flatCoords.length / 2;
         this.lineStringBatch.verticesCount += verticesCount;
         this.lineStringBatch.geometriesCount++;
         batchEntry.flatCoordss.push(flatCoords);
         batchEntry.verticesCount += verticesCount;
         break;
+      default:
+      // pass
     }
   }
 
   /**
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../Feature").default} feature Feature
    */
   changeFeature(feature) {
     this.clearFeatureEntryInPointBatch_(feature);
@@ -312,7 +345,7 @@ class MixedGeometryBatch {
   }
 
   /**
-   * @param {import("../../Feature").default} feature
+   * @param {import("../../Feature").default} feature Feature
    */
   removeFeature(feature) {
     this.clearFeatureEntryInPointBatch_(feature);
diff --git a/src/ol/render/webgl/PointBatchRenderer.js b/src/ol/render/webgl/PointBatchRenderer.js
index cc7ddb3318..09ca001250 100644
--- a/src/ol/render/webgl/PointBatchRenderer.js
+++ b/src/ol/render/webgl/PointBatchRenderer.js
@@ -2,17 +2,17 @@
  * @module ol/render/webgl/PointBatchRenderer
  */
 
-import {apply as applyTransform} from '../../transform.js';
-import {AttributeType} from '../../webgl/Helper.js';
 import AbstractBatchRenderer from './BatchRenderer.js';
+import {AttributeType} from '../../webgl/Helper.js';
+import {apply as applyTransform} from '../../transform.js';
 
 class PointBatchRenderer extends AbstractBatchRenderer {
   /**
-   * @param {import("../../webgl/Helper.js").default} helper
-   * @param {Worker} worker
-   * @param {string} vertexShader
-   * @param {string} fragmentShader
-   * @param {Array<import('./BatchRenderer.js').CustomAttribute>} customAttributes
+   * @param {import("../../webgl/Helper.js").default} helper WebGL helper instance
+   * @param {Worker} worker WebGL worker instance
+   * @param {string} vertexShader Vertex shader
+   * @param {string} fragmentShader Fragment shader
+   * @param {Array<import('./BatchRenderer.js').CustomAttribute>} customAttributes List of custom attributes
    */
   constructor(helper, worker, vertexShader, fragmentShader, customAttributes) {
     super(helper, worker, vertexShader, fragmentShader, customAttributes);
@@ -43,7 +43,7 @@ class PointBatchRenderer extends AbstractBatchRenderer {
   /**
    * Render instructions for lines are structured like so:
    * [ x0, y0, customAttr0, ... , xN, yN, customAttrN ]
-   * @param {import("./MixedGeometryBatch.js").PointGeometryBatch} batch
+   * @param {import("./MixedGeometryBatch.js").PointGeometryBatch} batch Point geometry batch
    * @override
    */
   generateRenderInstructions_(batch) {
diff --git a/src/ol/render/webgl/PolygonBatchRenderer.js b/src/ol/render/webgl/PolygonBatchRenderer.js
index b99f22659d..897b94ece3 100644
--- a/src/ol/render/webgl/PolygonBatchRenderer.js
+++ b/src/ol/render/webgl/PolygonBatchRenderer.js
@@ -1,17 +1,17 @@
 /**
  * @module ol/render/webgl/PolygonBatchRenderer
  */
+import AbstractBatchRenderer from './BatchRenderer.js';
 import {AttributeType} from '../../webgl/Helper.js';
 import {transform2D} from '../../geom/flat/transform.js';
-import AbstractBatchRenderer from './BatchRenderer.js';
 
 class PolygonBatchRenderer extends AbstractBatchRenderer {
   /**
-   * @param {import("../../webgl/Helper.js").default} helper
-   * @param {Worker} worker
-   * @param {string} vertexShader
-   * @param {string} fragmentShader
-   * @param {Array<import('./BatchRenderer.js').CustomAttribute>} customAttributes
+   * @param {import("../../webgl/Helper.js").default} helper WebGL helper instance
+   * @param {Worker} worker WebGL worker instance
+   * @param {string} vertexShader Vertex shader
+   * @param {string} fragmentShader Fragment shader
+   * @param {Array<import('./BatchRenderer.js').CustomAttribute>} customAttributes List of custom attributes
    */
   constructor(helper, worker, vertexShader, fragmentShader, customAttributes) {
     super(helper, worker, vertexShader, fragmentShader, customAttributes);
@@ -37,7 +37,7 @@ class PolygonBatchRenderer extends AbstractBatchRenderer {
   /**
    * Render instructions for polygons are structured like so:
    * [ customAttr0, ..., customAttrN, numberOfRings, numberOfVerticesInRing0, ..., numberOfVerticesInRingN, x0, y0, ..., xN, yN, numberOfRings,... ]
-   * @param {import("./MixedGeometryBatch.js").PolygonGeometryBatch} batch
+   * @param {import("./MixedGeometryBatch.js").PolygonGeometryBatch} batch Polygon geometry batch
    * @override
    */
   generateRenderInstructions_(batch) {
diff --git a/src/ol/render/webgl/utils.js b/src/ol/render/webgl/utils.js
index 9bfa7895c8..74605c26d9 100644
--- a/src/ol/render/webgl/utils.js
+++ b/src/ol/render/webgl/utils.js
@@ -1,9 +1,9 @@
 /**
  * @module ol/render/webgl/utils
  */
+import earcut from 'earcut';
 import {apply as applyTransform} from '../../transform.js';
 import {clamp} from '../../math.js';
-import earcut from 'earcut';
 
 const tmpArray_ = [];
 
@@ -103,9 +103,9 @@ export function writePointFeatureToBuffers(
  * @param {number} segmentEndIndex Index of the segment start point from which render instructions will be read.
  * @param {number|null} beforeSegmentIndex Index of the point right before the segment (null if none, e.g this is a line start)
  * @param {number|null} afterSegmentIndex Index of the point right after the segment (null if none, e.g this is a line end)
- * @param {number[]} vertexArray Array containing vertices.
- * @param {number[]} indexArray Array containing indices.
- * @param {number[]} customAttributes Array of custom attributes value
+ * @param {Array<number>} vertexArray Array containing vertices.
+ * @param {Array<number>} indexArray Array containing indices.
+ * @param {Array<number>} customAttributes Array of custom attributes value
  * @param {import('../../transform.js').Transform} instructionsTransform Transform matrix used to project coordinates in instructions
  * @param {import('../../transform.js').Transform} invertInstructionsTransform Transform matrix used to project coordinates in instructions
  * @private
@@ -125,7 +125,7 @@ export function writeLineSegmentToBuffers(
   // compute the stride to determine how many vertices were already pushed
   const baseVertexAttrsCount = 5; // base attributes: x0, y0, x1, y1, params (vertex number [0-3], join angle 1, join angle 2)
   const stride = baseVertexAttrsCount + customAttributes.length;
-  let baseIndex = vertexArray.length / stride;
+  const baseIndex = vertexArray.length / stride;
 
   // The segment is composed of two positions called P0[x0, y0] and P1[x1, y1]
   // Depending on whether there are points before and after the segment, its final shape
@@ -253,8 +253,8 @@ export function writeLineSegmentToBuffers(
  * Pushes several triangles to form a polygon, including holes
  * @param {Float32Array} instructions Array of render instructions for lines.
  * @param {number} polygonStartIndex Index of the polygon start point from which render instructions will be read.
- * @param {number[]} vertexArray Array containing vertices.
- * @param {number[]} indexArray Array containing indices.
+ * @param {Array<number>} vertexArray Array containing vertices.
+ * @param {Array<number>} indexArray Array containing indices.
  * @param {number} customAttributesCount Amount of custom attributes for each element.
  * @return {number} Next polygon instructions index
  * @private
@@ -279,7 +279,9 @@ export function writePolygonTrianglesToBuffers(
   const holes = new Array(ringsCount - 1);
   for (let i = 0; i < ringsCount; i++) {
     verticesCount += instructions[instructionsIndex++];
-    if (i < ringsCount - 1) holes[i] = verticesCount;
+    if (i < ringsCount - 1) {
+      holes[i] = verticesCount;
+    }
   }
   const flatCoords = instructions.slice(
     instructionsIndex,
diff --git a/src/ol/renderer/webgl/PointsLayer.js b/src/ol/renderer/webgl/PointsLayer.js
index bb3ca67fa8..3553d6121f 100644
--- a/src/ol/renderer/webgl/PointsLayer.js
+++ b/src/ol/renderer/webgl/PointsLayer.js
@@ -9,6 +9,7 @@ import WebGLLayerRenderer from './Layer.js';
 import WebGLRenderTarget from '../../webgl/RenderTarget.js';
 import {ARRAY_BUFFER, DYNAMIC_DRAW, ELEMENT_ARRAY_BUFFER} from '../../webgl.js';
 import {AttributeType, DefaultUniform} from '../../webgl/Helper.js';
+import {WebGLWorkerMessageType} from '../../render/webgl/constants.js';
 import {
   apply as applyTransform,
   create as createTransform,
@@ -18,11 +19,10 @@ import {
 } from '../../transform.js';
 import {assert} from '../../asserts.js';
 import {buffer, createEmpty, equals, getWidth} from '../../extent.js';
+import {colorDecodeId, colorEncodeId} from '../../render/webgl/utils.js';
 import {create as createWebGLWorker} from '../../worker/webgl.js';
 import {getUid} from '../../util.js';
 import {listen, unlistenByKey} from '../../events.js';
-import {colorDecodeId, colorEncodeId} from '../../render/webgl/utils.js';
-import {WebGLWorkerMessageType} from '../../render/webgl/constants.js';
 
 /**
  * @typedef {Object} CustomAttribute A description of a custom attribute to be passed on to the GPU, with a value different
diff --git a/src/ol/renderer/webgl/VectorLayer.js b/src/ol/renderer/webgl/VectorLayer.js
index 4542590906..5c4333cc7f 100644
--- a/src/ol/renderer/webgl/VectorLayer.js
+++ b/src/ol/renderer/webgl/VectorLayer.js
@@ -1,21 +1,20 @@
 /**
  * @module ol/renderer/webgl/VectorLayer
  */
-import WebGLLayerRenderer from './Layer.js';
-import {create as createTransform} from '../../transform.js';
-import {DefaultUniform} from '../../webgl/Helper.js';
-import {buffer, createEmpty, equals} from '../../extent.js';
-import {create as createWebGLWorker} from '../../worker/webgl.js';
-import {listen, unlistenByKey} from '../../events.js';
+import BaseVector from '../../layer/BaseVector.js';
+import GeometryType from '../../geom/GeometryType.js';
+import LineStringBatchRenderer from '../../render/webgl/LineStringBatchRenderer.js';
+import MixedGeometryBatch from '../../render/webgl/MixedGeometryBatch.js';
+import PointBatchRenderer from '../../render/webgl/PointBatchRenderer.js';
+import PolygonBatchRenderer from '../../render/webgl/PolygonBatchRenderer.js';
 import VectorEventType from '../../source/VectorEventType.js';
 import ViewHint from '../../ViewHint.js';
-import BaseVector from '../../layer/BaseVector.js';
-import MixedGeometryBatch from '../../render/webgl/MixedGeometryBatch.js';
-import GeometryType from '../../geom/GeometryType.js';
-import PolygonBatchRenderer from '../../render/webgl/PolygonBatchRenderer.js';
-import PointBatchRenderer from '../../render/webgl/PointBatchRenderer.js';
-import LineStringBatchRenderer from '../../render/webgl/LineStringBatchRenderer.js';
-import WebGLRenderTarget from '../../webgl/RenderTarget.js';
+import WebGLLayerRenderer from './Layer.js';
+import {DefaultUniform} from '../../webgl/Helper.js';
+import {buffer, createEmpty, equals} from '../../extent.js';
+import {create as createTransform} from '../../transform.js';
+import {create as createWebGLWorker} from '../../worker/webgl.js';
+import {listen, unlistenByKey} from '../../events.js';
 
 /**
  * @typedef {Object} CustomAttribute A description of a custom attribute to be passed on to the GPU, with a value different
diff --git a/src/ol/worker/webgl.js b/src/ol/worker/webgl.js
index 3b50434792..34cb5509f5 100644
--- a/src/ol/worker/webgl.js
+++ b/src/ol/worker/webgl.js
@@ -2,17 +2,17 @@
  * A worker that does cpu-heavy tasks related to webgl rendering.
  * @module ol/worker/webgl
  */
-import {assign} from '../obj.js';
 import {WebGLWorkerMessageType} from '../render/webgl/constants.js';
+import {assign} from '../obj.js';
+import {
+  create as createTransform,
+  makeInverse as makeInverseTransform,
+} from '../transform.js';
 import {
   writeLineSegmentToBuffers,
   writePointFeatureToBuffers,
   writePolygonTrianglesToBuffers,
 } from '../render/webgl/utils.js';
-import {
-  create as createTransform,
-  makeInverse as makeInverseTransform,
-} from '../transform.js';
 
 /** @type {any} */
 const worker = self;
@@ -170,6 +170,8 @@ worker.onmessage = (event) => {
       ]);
       break;
     }
+    default:
+    // pass
   }
 };
 
diff --git a/test/browser/spec/ol/render/webgl/batchrenderer.test.js b/test/browser/spec/ol/render/webgl/batchrenderer.test.js
index ef0c4e37cf..7d47eaad3d 100644
--- a/test/browser/spec/ol/render/webgl/batchrenderer.test.js
+++ b/test/browser/spec/ol/render/webgl/batchrenderer.test.js
@@ -1,17 +1,17 @@
-import PointBatchRenderer from '../../../../../../src/ol/render/webgl/PointBatchRenderer.js';
-import WebGLHelper from '../../../../../../src/ol/webgl/Helper.js';
-import {create as createWebGLWorker} from '../../../../../../src/ol/worker/webgl.js';
-import MixedGeometryBatch from '../../../../../../src/ol/render/webgl/MixedGeometryBatch.js';
 import Feature from '../../../../../../src/ol/Feature.js';
-import Point from '../../../../../../src/ol/geom/Point.js';
-import Polygon from '../../../../../../src/ol/geom/Polygon.js';
-import LineString from '../../../../../../src/ol/geom/LineString.js';
 import GeometryType from '../../../../../../src/ol/geom/GeometryType.js';
-import {create as createTransform} from '../../../../../../src/ol/transform.js';
-import {WebGLWorkerMessageType} from '../../../../../../src/ol/render/webgl/constants.js';
+import LineString from '../../../../../../src/ol/geom/LineString.js';
 import LineStringBatchRenderer from '../../../../../../src/ol/render/webgl/LineStringBatchRenderer.js';
-import {FLOAT} from '../../../../../../src/ol/webgl.js';
+import MixedGeometryBatch from '../../../../../../src/ol/render/webgl/MixedGeometryBatch.js';
+import Point from '../../../../../../src/ol/geom/Point.js';
+import PointBatchRenderer from '../../../../../../src/ol/render/webgl/PointBatchRenderer.js';
+import Polygon from '../../../../../../src/ol/geom/Polygon.js';
 import PolygonBatchRenderer from '../../../../../../src/ol/render/webgl/PolygonBatchRenderer.js';
+import WebGLHelper from '../../../../../../src/ol/webgl/Helper.js';
+import {FLOAT} from '../../../../../../src/ol/webgl.js';
+import {WebGLWorkerMessageType} from '../../../../../../src/ol/render/webgl/constants.js';
+import {create as createTransform} from '../../../../../../src/ol/transform.js';
+import {create as createWebGLWorker} from '../../../../../../src/ol/worker/webgl.js';
 
 const POINT_VERTEX_SHADER = `precision mediump float;
 void main(void) {}`;
diff --git a/test/browser/spec/ol/render/webgl/mixedgeometrybatch.test.js b/test/browser/spec/ol/render/webgl/mixedgeometrybatch.test.js
index cd28c50e3d..dba8e79485 100644
--- a/test/browser/spec/ol/render/webgl/mixedgeometrybatch.test.js
+++ b/test/browser/spec/ol/render/webgl/mixedgeometrybatch.test.js
@@ -1,14 +1,14 @@
 import Feature from '../../../../../../src/ol/Feature.js';
-import Point from '../../../../../../src/ol/geom/Point.js';
-import MixedGeometryBatch from '../../../../../../src/ol/render/webgl/MixedGeometryBatch.js';
-import LineString from '../../../../../../src/ol/geom/LineString.js';
-import {getUid} from '../../../../../../src/ol/index.js';
-import Polygon from '../../../../../../src/ol/geom/Polygon.js';
-import LinearRing from '../../../../../../src/ol/geom/LinearRing.js';
-import MultiPolygon from '../../../../../../src/ol/geom/MultiPolygon.js';
 import GeometryCollection from '../../../../../../src/ol/geom/GeometryCollection.js';
+import LineString from '../../../../../../src/ol/geom/LineString.js';
+import LinearRing from '../../../../../../src/ol/geom/LinearRing.js';
+import MixedGeometryBatch from '../../../../../../src/ol/render/webgl/MixedGeometryBatch.js';
 import MultiLineString from '../../../../../../src/ol/geom/MultiLineString.js';
 import MultiPoint from '../../../../../../src/ol/geom/MultiPoint.js';
+import MultiPolygon from '../../../../../../src/ol/geom/MultiPolygon.js';
+import Point from '../../../../../../src/ol/geom/Point.js';
+import Polygon from '../../../../../../src/ol/geom/Polygon.js';
+import {getUid} from '../../../../../../src/ol/index.js';
 
 describe('MixedGeometryBatch', function () {
   let mixedBatch;
diff --git a/test/browser/spec/ol/renderer/webgl/Layer.test.js b/test/browser/spec/ol/renderer/webgl/Layer.test.js
index e50d7ecfec..60a5581990 100644
--- a/test/browser/spec/ol/renderer/webgl/Layer.test.js
+++ b/test/browser/spec/ol/renderer/webgl/Layer.test.js
@@ -8,12 +8,6 @@ import VectorSource from '../../../../../../src/ol/source/Vector.js';
 import View from '../../../../../../src/ol/View.js';
 import WebGLLayerRenderer from '../../../../../../src/ol/renderer/webgl/Layer.js';
 import {getUid} from '../../../../../../src/ol/util.js';
-import {
-  colorDecodeId,
-  colorEncodeId,
-  getBlankImageData,
-  writePointFeatureToBuffers,
-} from '../../../../../../src/ol/render/webgl/utils.js';
 
 describe('ol/renderer/webgl/Layer', function () {
   describe('constructor', function () {