diff --git a/src/ol/source/BingMaps.js b/src/ol/source/BingMaps.js
index c12e5d9aa7..a3ad5320cf 100644
--- a/src/ol/source/BingMaps.js
+++ b/src/ol/source/BingMaps.js
@@ -94,7 +94,7 @@ const TOS_ATTRIBUTION = '<a class="ol-attribution-bing-tos" ' +
  */
 class BingMaps extends TileImage {
   /**
-   * @param {Options=} options Bing Maps options.
+   * @param {Options} options Bing Maps options.
    */
   constructor(options) {
 
diff --git a/src/ol/source/CartoDB.js b/src/ol/source/CartoDB.js
index 19bea26c37..f52efef7df 100644
--- a/src/ol/source/CartoDB.js
+++ b/src/ol/source/CartoDB.js
@@ -44,7 +44,7 @@ import XYZ from '../source/XYZ.js';
  */
 class CartoDB extends XYZ {
   /**
-   * @param {Options=} options CartoDB options.
+   * @param {Options} options CartoDB options.
    */
   constructor(options) {
     super({
diff --git a/src/ol/source/ImageMapGuide.js b/src/ol/source/ImageMapGuide.js
index 9709e064f3..e5f4edb856 100644
--- a/src/ol/source/ImageMapGuide.js
+++ b/src/ol/source/ImageMapGuide.js
@@ -41,7 +41,7 @@ import {appendParams} from '../uri.js';
  */
 class ImageMapGuide extends ImageSource {
   /**
-   * @param {Options=} options ImageMapGuide options.
+   * @param {Options} options ImageMapGuide options.
    */
   constructor(options) {
 
diff --git a/src/ol/source/ImageStatic.js b/src/ol/source/ImageStatic.js
index 0ea05f14b2..d64ad1ece4 100644
--- a/src/ol/source/ImageStatic.js
+++ b/src/ol/source/ImageStatic.js
@@ -35,7 +35,7 @@ import ImageSource, {defaultImageLoadFunction} from '../source/Image.js';
  */
 class Static extends ImageSource {
   /**
-   * @param {Options=} options ImageStatic options.
+   * @param {Options} options ImageStatic options.
    */
   constructor(options) {
     const crossOrigin = options.crossOrigin !== undefined ?
diff --git a/src/ol/source/Raster.js b/src/ol/source/Raster.js
index 3c785f3fa0..5b0ad3d1a3 100644
--- a/src/ol/source/Raster.js
+++ b/src/ol/source/Raster.js
@@ -144,7 +144,7 @@ class RasterSourceEvent extends Event {
  */
 class RasterSource extends ImageSource {
   /**
-   * @param {Options=} options Options.
+   * @param {Options} options Options.
    */
   constructor(options) {
     super({});
diff --git a/src/ol/source/Stamen.js b/src/ol/source/Stamen.js
index 6015bceec4..94b6df2f2f 100644
--- a/src/ol/source/Stamen.js
+++ b/src/ol/source/Stamen.js
@@ -116,7 +116,7 @@ const ProviderConfig = {
  */
 class Stamen extends XYZ {
   /**
-   * @param {Options=} options Stamen options.
+   * @param {Options} options Stamen options.
    */
   constructor(options) {
     const i = options.layer.indexOf('-');
diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index d5be391ec7..b38a52455c 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -35,7 +35,7 @@ import {wrapX, getForProjection as getTileGridForProjection} from '../tilegrid.j
  */
 class TileSource extends Source {
   /**
-   * @param {Options=} options SourceTile source options.
+   * @param {Options} options SourceTile source options.
    */
   constructor(options) {
 
diff --git a/src/ol/source/TileDebug.js b/src/ol/source/TileDebug.js
index 64f85d6f09..0232c4f546 100644
--- a/src/ol/source/TileDebug.js
+++ b/src/ol/source/TileDebug.js
@@ -91,7 +91,7 @@ class LabeledTile extends Tile {
  */
 class TileDebug extends TileSource {
   /**
-   * @param {Options=} options Debug tile options.
+   * @param {Options} options Debug tile options.
    */
   constructor(options) {
 
diff --git a/src/ol/source/TileJSON.js b/src/ol/source/TileJSON.js
index b1ef04f08c..2461d19069 100644
--- a/src/ol/source/TileJSON.js
+++ b/src/ol/source/TileJSON.js
@@ -70,7 +70,7 @@ import {createXYZ, extentFromProjection} from '../tilegrid.js';
  */
 class TileJSON extends TileImage {
   /**
-   * @param {Options=} options TileJSON options.
+   * @param {Options} options TileJSON options.
    */
   constructor(options) {
     super({
diff --git a/src/ol/source/UTFGrid.js b/src/ol/source/UTFGrid.js
index 74b9b532f4..fcb2b528f0 100644
--- a/src/ol/source/UTFGrid.js
+++ b/src/ol/source/UTFGrid.js
@@ -279,7 +279,7 @@ export class CustomTile extends Tile {
  */
 class UTFGrid extends TileSource {
   /**
-   * @param {Options=} options Source options.
+   * @param {Options} options Source options.
    */
   constructor(options) {
     super({
diff --git a/src/ol/source/UrlTile.js b/src/ol/source/UrlTile.js
index fb6e625a70..55af659331 100644
--- a/src/ol/source/UrlTile.js
+++ b/src/ol/source/UrlTile.js
@@ -35,7 +35,7 @@ import {getKeyZXY} from '../tilecoord.js';
  */
 class UrlTile extends TileSource {
   /**
-   * @param {Options=} options Image tile options.
+   * @param {Options} options Image tile options.
    */
   constructor(options) {
 
diff --git a/src/ol/source/WMTS.js b/src/ol/source/WMTS.js
index afc9c31825..8f15205269 100644
--- a/src/ol/source/WMTS.js
+++ b/src/ol/source/WMTS.js
@@ -63,7 +63,7 @@ import {appendParams} from '../uri.js';
  */
 class WMTS extends TileImage {
   /**
-   * @param {Options=} options WMTS options.
+   * @param {Options} options WMTS options.
    */
   constructor(options) {