Throw when calling abstract methods; fix abstract return types

2018-10-30 18:45:42 +01:00
parent 2adac0b3e7
commit 1cdd040c96
22 changed files with 273 additions and 85 deletions
--- a/src/ol/ImageBase.js
+++ b/src/ol/ImageBase.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/ImageBase
 */
+import {abstract} from './util.js';
 import EventTarget from './events/Target.js';
 import EventType from './events/EventType.js';

@@ -63,7 +64,9 @@ class ImageBase extends EventTarget {
   * @abstract
   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.
   */
-  getImage() {}
+  getImage() {
+    return abstract();
+  }

  /**
   * @return {number} PixelRatio.
@@ -90,7 +93,9 @@ class ImageBase extends EventTarget {
   * Load not yet loaded URI.
   * @abstract
   */
-  load() {}
+  load() {
+    abstract();
+  }
 }


--- a/src/ol/format/Feature.js
+++ b/src/ol/format/Feature.js
@@ -2,6 +2,7 @@
 * @module ol/format/Feature
 */
 import {assign} from '../obj.js';
+import {abstract} from '../util.js';
 import {get as getProjection, equivalent as equivalentProjection, transformExtent} from '../proj.js';


@@ -122,7 +123,9 @@ class FeatureFormat {
   * @abstract
   * @return {import("./FormatType.js").default} Format.
   */
-  getType() {}
+  getType() {
+    return abstract();
+  }

  /**
   * Read a single feature from a source.
@@ -132,7 +135,9 @@ class FeatureFormat {
   * @param {ReadOptions=} opt_options Read options.
   * @return {import("../Feature.js").FeatureLike} Feature.
   */
-  readFeature(source, opt_options) {}
+  readFeature(source, opt_options) {
+    return abstract();
+  }

  /**
   * Read all features from a source.
@@ -142,7 +147,9 @@ class FeatureFormat {
   * @param {ReadOptions=} opt_options Read options.
   * @return {Array<import("../Feature.js").FeatureLike>} Features.
   */
-  readFeatures(source, opt_options) {}
+  readFeatures(source, opt_options) {
+    return abstract();
+  }

  /**
   * Read a single geometry from a source.
@@ -152,7 +159,9 @@ class FeatureFormat {
   * @param {ReadOptions=} opt_options Read options.
   * @return {import("../geom/Geometry.js").default} Geometry.
   */
-  readGeometry(source, opt_options) {}
+  readGeometry(source, opt_options) {
+    return abstract();
+  }

  /**
   * Read the projection from a source.
@@ -161,7 +170,9 @@ class FeatureFormat {
   * @param {Document|Node|Object|string} source Source.
   * @return {import("../proj/Projection.js").default} Projection.
   */
-  readProjection(source) {}
+  readProjection(source) {
+    return abstract();
+  }

  /**
   * Encode a feature in this format.
@@ -171,7 +182,9 @@ class FeatureFormat {
   * @param {WriteOptions=} opt_options Write options.
   * @return {string} Result.
   */
-  writeFeature(feature, opt_options) {}
+  writeFeature(feature, opt_options) {
+    return abstract();
+  }

  /**
   * Encode an array of features in this format.
@@ -181,7 +194,9 @@ class FeatureFormat {
   * @param {WriteOptions=} opt_options Write options.
   * @return {string} Result.
   */
-  writeFeatures(features, opt_options) {}
+  writeFeatures(features, opt_options) {
+    return abstract();
+  }

  /**
   * Write a single geometry in this format.
@@ -191,7 +206,9 @@ class FeatureFormat {
   * @param {WriteOptions=} opt_options Write options.
   * @return {string} Result.
   */
-  writeGeometry(geometry, opt_options) {}
+  writeGeometry(geometry, opt_options) {
+    return abstract();
+  }
 }

 export default FeatureFormat;
--- a/src/ol/format/JSONFeature.js
+++ b/src/ol/format/JSONFeature.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/format/JSONFeature
 */
+import {abstract} from '../util.js';
 import FeatureFormat from '../format/Feature.js';
 import FormatType from '../format/FormatType.js';

@@ -59,7 +60,9 @@ class JSONFeature extends FeatureFormat {
   * @protected
   * @return {import("../Feature.js").default} Feature.
   */
-  readFeatureFromObject(object, opt_options) {}
+  readFeatureFromObject(object, opt_options) {
+    return abstract();
+  }

  /**
   * @abstract
@@ -68,7 +71,9 @@ class JSONFeature extends FeatureFormat {
   * @protected
   * @return {Array<import("../Feature.js").default>} Features.
   */
-  readFeaturesFromObject(object, opt_options) {}
+  readFeaturesFromObject(object, opt_options) {
+    return abstract();
+  }

  /**
   * Read a geometry.
@@ -90,7 +95,9 @@ class JSONFeature extends FeatureFormat {
   * @protected
   * @return {import("../geom/Geometry.js").default} Geometry.
   */
-  readGeometryFromObject(object, opt_options) {}
+  readGeometryFromObject(object, opt_options) {
+    return abstract();
+  }

  /**
   * Read the projection.
@@ -109,7 +116,9 @@ class JSONFeature extends FeatureFormat {
   * @protected
   * @return {import("../proj/Projection.js").default} Projection.
   */
-  readProjectionFromObject(object) {}
+  readProjectionFromObject(object) {
+    return abstract();
+  }

  /**
   * Encode a feature as string.
@@ -129,7 +138,9 @@ class JSONFeature extends FeatureFormat {
   * @param {import("./Feature.js").WriteOptions=} opt_options Write options.
   * @return {Object} Object.
   */
-  writeFeatureObject(feature, opt_options) {}
+  writeFeatureObject(feature, opt_options) {
+    return abstract();
+  }

  /**
   * Encode an array of features as string.
@@ -149,7 +160,9 @@ class JSONFeature extends FeatureFormat {
   * @param {import("./Feature.js").WriteOptions=} opt_options Write options.
   * @return {Object} Object.
   */
-  writeFeaturesObject(features, opt_options) {}
+  writeFeaturesObject(features, opt_options) {
+    return abstract();
+  }

  /**
   * Encode a geometry as string.
@@ -169,7 +182,9 @@ class JSONFeature extends FeatureFormat {
   * @param {import("./Feature.js").WriteOptions=} opt_options Write options.
   * @return {Object} Object.
   */
-  writeGeometryObject(geometry, opt_options) {}
+  writeGeometryObject(geometry, opt_options) {
+    return abstract();
+  }
 }


--- a/src/ol/format/TextFeature.js
+++ b/src/ol/format/TextFeature.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/format/TextFeature
 */
+import {abstract} from '../util.js';
 import FeatureFormat from '../format/Feature.js';
 import FormatType from '../format/FormatType.js';

@@ -43,7 +44,9 @@ class TextFeature extends FeatureFormat {
   * @protected
   * @return {import("../Feature.js").default} Feature.
   */
-  readFeatureFromText(text, opt_options) {}
+  readFeatureFromText(text, opt_options) {
+    return abstract();
+  }

  /**
   * Read the features from the source.
@@ -64,7 +67,9 @@ class TextFeature extends FeatureFormat {
   * @protected
   * @return {Array<import("../Feature.js").default>} Features.
   */
-  readFeaturesFromText(text, opt_options) {}
+  readFeaturesFromText(text, opt_options) {
+    return abstract();
+  }

  /**
   * Read the geometry from the source.
@@ -85,7 +90,9 @@ class TextFeature extends FeatureFormat {
   * @protected
   * @return {import("../geom/Geometry.js").default} Geometry.
   */
-  readGeometryFromText(text, opt_options) {}
+  readGeometryFromText(text, opt_options) {
+    return abstract();
+  }

  /**
   * Read the projection from the source.
@@ -126,7 +133,9 @@ class TextFeature extends FeatureFormat {
   * @protected
   * @return {string} Text.
   */
-  writeFeatureText(feature, opt_options) {}
+  writeFeatureText(feature, opt_options) {
+    return abstract();
+  }

  /**
   * Encode an array of features as string.
@@ -147,7 +156,9 @@ class TextFeature extends FeatureFormat {
   * @protected
   * @return {string} Text.
   */
-  writeFeaturesText(features, opt_options) {}
+  writeFeaturesText(features, opt_options) {
+    return abstract();
+  }

  /**
   * Write a single geometry.
@@ -168,7 +179,9 @@ class TextFeature extends FeatureFormat {
   * @protected
   * @return {string} Text.
   */
-  writeGeometryText(geometry, opt_options) {}
+  writeGeometryText(geometry, opt_options) {
+    return abstract();
+  }
 }


--- a/src/ol/format/XMLFeature.js
+++ b/src/ol/format/XMLFeature.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/format/XMLFeature
 */
+import {abstract} from '../util.js';
 import {extend} from '../array.js';
 import FeatureFormat from '../format/Feature.js';
 import FormatType from '../format/FormatType.js';
@@ -122,7 +123,9 @@ class XMLFeature extends FeatureFormat {
   * @protected
   * @return {Array<import("../Feature.js").default>} Features.
   */
-  readFeaturesFromNode(node, opt_options) {}
+  readFeaturesFromNode(node, opt_options) {
+    return abstract();
+  }

  /**
   * @inheritDoc
--- a/src/ol/geom/Geometry.js
+++ b/src/ol/geom/Geometry.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/geom/Geometry
 */
+import {abstract} from '../util.js';
 import BaseObject from '../Object.js';
 import {createEmpty, getHeight, returnOrUpdate} from '../extent.js';
 import {transform2D} from '../geom/flat/transform.js';
@@ -69,7 +70,9 @@ class Geometry extends BaseObject {
   * @abstract
   * @return {!Geometry} Clone.
   */
-  clone() {}
+  clone() {
+    return abstract();
+  }

  /**
   * @abstract
@@ -79,7 +82,9 @@ class Geometry extends BaseObject {
   * @param {number} minSquaredDistance Minimum squared distance.
   * @return {number} Minimum squared distance.
   */
-  closestPointXY(x, y, closestPoint, minSquaredDistance) {}
+  closestPointXY(x, y, closestPoint, minSquaredDistance) {
+    return abstract();
+  }

  /**
   * @param {number} x X.
@@ -121,7 +126,9 @@ class Geometry extends BaseObject {
   * @protected
   * @return {import("../extent.js").Extent} extent Extent.
   */
-  computeExtent(extent) {}
+  computeExtent(extent) {
+    return abstract();
+  }

  /**
   * Get the extent of the geometry.
@@ -145,7 +152,9 @@ class Geometry extends BaseObject {
   * @param {import("../coordinate.js").Coordinate} anchor The rotation center.
   * @api
   */
-  rotate(angle, anchor) {}
+  rotate(angle, anchor) {
+    abstract();
+  }

  /**
   * Scale the geometry (with an optional origin).  This modifies the geometry
@@ -158,7 +167,9 @@ class Geometry extends BaseObject {
   *     of the geometry extent).
   * @api
   */
-  scale(sx, opt_sy, opt_anchor) {}
+  scale(sx, opt_sy, opt_anchor) {
+    abstract();
+  }

  /**
   * Create a simplified version of this geometry.  For linestrings, this uses
@@ -182,14 +193,18 @@ class Geometry extends BaseObject {
   * @param {number} squaredTolerance Squared tolerance.
   * @return {Geometry} Simplified geometry.
   */
-  getSimplifiedGeometry(squaredTolerance) {}
+  getSimplifiedGeometry(squaredTolerance) {
+    return abstract();
+  }

  /**
   * Get the type of this geometry.
   * @abstract
   * @return {import("./GeometryType.js").default} Geometry type.
   */
-  getType() {}
+  getType() {
+    return abstract();
+  }

  /**
   * Apply a transform function to each coordinate of the geometry.
@@ -199,7 +214,9 @@ class Geometry extends BaseObject {
   * @abstract
   * @param {import("../proj.js").TransformFunction} transformFn Transform.
   */
-  applyTransform(transformFn) {}
+  applyTransform(transformFn) {
+    abstract();
+  }

  /**
   * Test if the geometry and the passed extent intersect.
@@ -207,7 +224,9 @@ class Geometry extends BaseObject {
   * @param {import("../extent.js").Extent} extent Extent.
   * @return {boolean} `true` if the geometry and the extent intersect.
   */
-  intersectsExtent(extent) {}
+  intersectsExtent(extent) {
+    return abstract();
+  }

  /**
   * Translate the geometry.  This modifies the geometry coordinates in place.  If
@@ -217,7 +236,9 @@ class Geometry extends BaseObject {
   * @param {number} deltaY Delta Y.
   * @api
   */
-  translate(deltaX, deltaY) {}
+  translate(deltaX, deltaY) {
+    abstract();
+  }

  /**
   * Transform each coordinate of the geometry from one coordinate reference
--- a/src/ol/geom/SimpleGeometry.js
+++ b/src/ol/geom/SimpleGeometry.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/geom/SimpleGeometry
 */
+import {abstract} from '../util.js';
 import {createOrUpdateFromFlatCoordinates, getCenter} from '../extent.js';
 import Geometry from '../geom/Geometry.js';
 import GeometryLayout from '../geom/GeometryLayout.js';
@@ -52,7 +53,9 @@ class SimpleGeometry extends Geometry {
   * @abstract
   * @return {Array} Coordinates.
   */
-  getCoordinates() {}
+  getCoordinates() {
+    return abstract();
+  }

  /**
   * Return the first coordinate of the geometry.
@@ -158,7 +161,9 @@ class SimpleGeometry extends Geometry {
   * @param {!Array} coordinates Coordinates.
   * @param {GeometryLayout=} opt_layout Layout.
   */
-  setCoordinates(coordinates, opt_layout) {}
+  setCoordinates(coordinates, opt_layout) {
+    abstract();
+  }

  /**
   * @param {GeometryLayout|undefined} layout Layout.
--- a/src/ol/layer/Base.js
+++ b/src/ol/layer/Base.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/layer/Base
 */
+import {abstract} from '../util.js';
 import BaseObject from '../Object.js';
 import LayerProperty from '../layer/Property.js';
 import {clamp} from '../math.js';
@@ -105,7 +106,9 @@ class BaseLayer extends BaseObject {
   *     modified in place).
   * @return {Array<import("./Layer.js").default>} Array of layers.
   */
-  getLayersArray(opt_array) {}
+  getLayersArray(opt_array) {
+    return abstract();
+  }

  /**
   * @abstract
@@ -113,7 +116,9 @@ class BaseLayer extends BaseObject {
   *     states (to be modified in place).
   * @return {Array<import("./Layer.js").State>} List of layer states.
   */
-  getLayerStatesArray(opt_states) {}
+  getLayerStatesArray(opt_states) {
+    return abstract();
+  }

  /**
   * Return the {@link module:ol/extent~Extent extent} of the layer or `undefined` if it
@@ -162,7 +167,9 @@ class BaseLayer extends BaseObject {
   * @abstract
   * @return {import("../source/State.js").default} Source state.
   */
-  getSourceState() {}
+  getSourceState() {
+    return abstract();
+  }

  /**
   * Return the visibility of the layer (`true` or `false`).
--- a/src/ol/render/ReplayGroup.js
+++ b/src/ol/render/ReplayGroup.js
@@ -1,6 +1,8 @@
 /**
 * @module ol/render/ReplayGroup
 */
+import {abstract} from '../util.js';
+
 /**
 * Base class for replay groups.
 */
@@ -11,20 +13,26 @@ class ReplayGroup {
   * @param {import("./ReplayType.js").default} replayType Replay type.
   * @return {import("./VectorContext.js").default} Replay.
   */
-  getReplay(zIndex, replayType) {}
+  getReplay(zIndex, replayType) {
+    return abstract();
+  }

  /**
   * @abstract
   * @return {boolean} Is empty.
   */
-  isEmpty() {}
+  isEmpty() {
+    return abstract();
+  }

  /**
   * @abstract
   * @param {boolean} group Group with previous replay
   * @return {Array<*>} The resulting instruction group
   */
-  addDeclutter(group) {}
+  addDeclutter(group) {
+    return abstract();
+  }
 }

 export default ReplayGroup;
--- a/src/ol/render/webgl/Replay.js
+++ b/src/ol/render/webgl/Replay.js
@@ -1,7 +1,7 @@
 /**
 * @module ol/render/webgl/Replay
 */
-
+import {abstract} from '../../util.js';
 import {getCenter} from '../../extent.js';
 import VectorContext from '../VectorContext.js';
 import {
@@ -122,13 +122,17 @@ class WebGLReplay extends VectorContext {
   * @param {import("../../webgl/Context.js").default} context WebGL context.
   * @return {function()} Delete resources function.
   */
-  getDeleteResourcesFunction(context) {}
+  getDeleteResourcesFunction(context) {
+    return abstract();
+  }

  /**
   * @abstract
   * @param {import("../../webgl/Context.js").default} context Context.
   */
-  finish(context) {}
+  finish(context) {
+    abstract();
+  }

  /**
   * @abstract
@@ -142,7 +146,9 @@ class WebGLReplay extends VectorContext {
     import("./polygonreplay/defaultshader/Locations.js").default|
     import("./texturereplay/defaultshader/Locations.js").default} Locations.
   */
-  setUpProgram(gl, context, size, pixelRatio) {}
+  setUpProgram(gl, context, size, pixelRatio) {
+    return abstract();
+  }

  /**
   * @abstract
@@ -153,7 +159,9 @@ class WebGLReplay extends VectorContext {
     import("./polygonreplay/defaultshader/Locations.js").default|
     import("./texturereplay/defaultshader/Locations.js").default} locations Locations.
   */
-  shutDownProgram(gl, locations) {}
+  shutDownProgram(gl, locations) {
+    abstract();
+  }

  /**
   * @abstract
@@ -163,7 +171,9 @@ class WebGLReplay extends VectorContext {
   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features to skip.
   * @param {boolean} hitDetection Hit detection mode.
   */
-  drawReplay(gl, context, skippedFeaturesHash, hitDetection) {}
+  drawReplay(gl, context, skippedFeaturesHash, hitDetection) {
+    abstract();
+  }

  /**
   * @abstract
@@ -176,7 +186,9 @@ class WebGLReplay extends VectorContext {
   * @return {T|undefined} Callback result.
   * @template T
   */
-  drawHitDetectionReplayOneByOne(gl, context, skippedFeaturesHash, featureCallback, opt_hitExtent) {}
+  drawHitDetectionReplayOneByOne(gl, context, skippedFeaturesHash, featureCallback, opt_hitExtent) {
+    return abstract();
+  }

  /**
   * @protected
--- a/src/ol/render/webgl/TextureReplay.js
+++ b/src/ol/render/webgl/TextureReplay.js
@@ -1,7 +1,7 @@
 /**
 * @module ol/render/webgl/TextureReplay
 */
-import {getUid} from '../../util.js';
+import {abstract, getUid} from '../../util.js';
 import {intersects} from '../../extent.js';
 import {isEmpty} from '../../obj.js';
 import {fragment, vertex} from '../webgl/texturereplay/defaultshader.js';
@@ -460,16 +460,20 @@ class WebGLTextureReplay extends WebGLReplay {
   * @abstract
   * @protected
   * @param {boolean=} opt_all Return hit detection textures with regular ones.
-   * @returns {Array<WebGLTexture>} Textures.
+   * @return {Array<WebGLTexture>} Textures.
   */
-  getTextures(opt_all) {}
+  getTextures(opt_all) {
+    return abstract();
+  }

  /**
   * @abstract
   * @protected
-   * @returns {Array<WebGLTexture>} Textures.
+   * @return {Array<WebGLTexture>} Textures.
   */
-  getHitDetectionTextures() {}
+  getHitDetectionTextures() {
+    return abstract();
+  }
 }


--- a/src/ol/renderer/Map.js
+++ b/src/ol/renderer/Map.js
@@ -1,7 +1,7 @@
 /**
 * @module ol/renderer/Map
 */
-import {getUid} from '../util.js';
+import {abstract, getUid} from '../util.js';
 import Disposable from '../Disposable.js';
 import {listen, unlistenByKey} from '../events.js';
 import EventType from '../events/EventType.js';
@@ -11,7 +11,9 @@ import {visibleAtResolution} from '../layer/Layer.js';
 import {shared as iconImageCache} from '../style/IconImageCache.js';
 import {compose as composeTransform, invert as invertTransform, setFromArray as transformSetFromArray} from '../transform.js';

-
+/**
+ * @abstract
+ */
 class MapRenderer extends Disposable {

  /**
@@ -51,7 +53,9 @@ class MapRenderer extends Disposable {
   * @param {import("../render/EventType.js").default} type Event type.
   * @param {import("../PluggableMap.js").FrameState} frameState Frame state.
   */
-  dispatchRenderEvent(type, frameState) {}
+  dispatchRenderEvent(type, frameState) {
+    abstract();
+  }

  /**
   * Register layer renderer constructors.
@@ -179,7 +183,9 @@ class MapRenderer extends Disposable {
   * @return {T|undefined} Callback result.
   * @template S,T,U
   */
-  forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, thisArg, layerFilter, thisArg2) {}
+  forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, thisArg, layerFilter, thisArg2) {
+    return abstract();
+  }

  /**
   * @param {import("../coordinate.js").Coordinate} coordinate Coordinate.
@@ -290,11 +296,13 @@ class MapRenderer extends Disposable {
  }

  /**
-   * @abstract
   * Render.
+   * @abstract
   * @param {?import("../PluggableMap.js").FrameState} frameState Frame state.
   */
-  renderFrame(frameState) {}
+  renderFrame(frameState) {
+    abstract();
+  }

  /**
   * @param {import("../PluggableMap.js").FrameState} frameState Frame state.
--- a/src/ol/renderer/canvas/IntermediateCanvas.js
+++ b/src/ol/renderer/canvas/IntermediateCanvas.js
@@ -1,12 +1,16 @@
 /**
 * @module ol/renderer/canvas/IntermediateCanvas
 */
+import {abstract} from '../../util.js';
 import {scale as scaleCoordinate} from '../../coordinate.js';
 import {createCanvasContext2D} from '../../dom.js';
 import {containsExtent, intersects} from '../../extent.js';
 import CanvasLayerRenderer from '../canvas/Layer.js';
 import {create as createTransform, apply as applyTransform} from '../../transform.js';

+/**
+ * @abstract
+ */
 class IntermediateCanvasRenderer extends CanvasLayerRenderer {

  /**
@@ -80,13 +84,17 @@ class IntermediateCanvasRenderer extends CanvasLayerRenderer {
   * @abstract
   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Canvas.
   */
-  getImage() {}
+  getImage() {
+    return abstract();
+  }

  /**
   * @abstract
   * @return {!import("../../transform.js").Transform} Image transform.
   */
-  getImageTransform() {}
+  getImageTransform() {
+    return abstract();
+  }

  /**
   * @inheritDoc
--- a/src/ol/renderer/canvas/Layer.js
+++ b/src/ol/renderer/canvas/Layer.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/renderer/canvas/Layer
 */
+import {abstract} from '../../util.js';
 import {getBottomLeft, getBottomRight, getTopLeft, getTopRight} from '../../extent.js';
 import {TRUE} from '../../functions.js';
 import RenderEvent from '../../render/Event.js';
@@ -10,6 +11,9 @@ import CanvasImmediateRenderer from '../../render/canvas/Immediate.js';
 import LayerRenderer from '../Layer.js';
 import {create as createTransform, apply as applyTransform, compose as composeTransform} from '../../transform.js';

+/**
+ * @abstract
+ */
 class CanvasLayerRenderer extends LayerRenderer {

  /**
@@ -167,7 +171,9 @@ class CanvasLayerRenderer extends LayerRenderer {
   * @param {import("../../layer/Layer.js").State} layerState Layer state.
   * @param {CanvasRenderingContext2D} context Context.
   */
-  composeFrame(frameState, layerState, context) {}
+  composeFrame(frameState, layerState, context) {
+    abstract();
+  }

  /**
   * @abstract
@@ -175,7 +181,9 @@ class CanvasLayerRenderer extends LayerRenderer {
   * @param {import("../../layer/Layer.js").State} layerState Layer state.
   * @return {boolean} whether composeFrame should be called.
   */
-  prepareFrame(frameState, layerState) {}
+  prepareFrame(frameState, layerState) {
+    return abstract();
+  }
 }

 export default CanvasLayerRenderer;
--- a/src/ol/renderer/webgl/Layer.js
+++ b/src/ol/renderer/webgl/Layer.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/renderer/webgl/Layer
 */
+import {abstract} from '../../util.js';
 import RenderEvent from '../../render/Event.js';
 import RenderEventType from '../../render/EventType.js';
 import WebGLImmediateRenderer from '../../render/webgl/Immediate.js';
@@ -14,6 +15,9 @@ import {ARRAY_BUFFER, FRAMEBUFFER, FLOAT, TEXTURE_2D,
 import WebGLBuffer from '../../webgl/Buffer.js';
 import {createEmptyTexture} from '../../webgl/Context.js';

+/**
+ * @abstract
+ */
 class WebGLLayerRenderer extends LayerRenderer {

  /**
@@ -236,7 +240,9 @@ class WebGLLayerRenderer extends LayerRenderer {
   * @param {import("../../webgl/Context.js").default} context Context.
   * @return {boolean} whether composeFrame should be called.
   */
-  prepareFrame(frameState, layerState, context) {}
+  prepareFrame(frameState, layerState, context) {
+    return abstract();
+  }

  /**
   * @abstract
@@ -248,7 +254,9 @@ class WebGLLayerRenderer extends LayerRenderer {
   * @return {T|undefined} Callback result.
   * @template S,T,U
   */
-  forEachLayerAtPixel(pixel, frameState, callback, thisArg) {}
+  forEachLayerAtPixel(pixel, frameState, callback, thisArg) {
+    return abstract();
+  }
 }


--- a/src/ol/source/Image.js
+++ b/src/ol/source/Image.js
@@ -1,8 +1,8 @@
 /**
 * @module ol/source/Image
 */
+import {abstract} from '../util.js';
 import {ENABLE_RASTER_REPROJECTION} from '../reproj/common.js';
-
 import ImageState from '../ImageState.js';
 import {linearFindNearest} from '../array.js';
 import Event from '../events/Event.js';
@@ -81,6 +81,7 @@ class ImageSourceEvent extends Event {
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for sources providing a single image.
+ * @abstract
 * @api
 */
 class ImageSource extends Source {
@@ -188,7 +189,9 @@ class ImageSource extends Source {
   * @return {import("../ImageBase.js").default} Single image.
   * @protected
   */
-  getImageInternal(extent, resolution, pixelRatio, projection) {}
+  getImageInternal(extent, resolution, pixelRatio, projection) {
+    return abstract();
+  }

  /**
   * Handle image change events.
--- a/src/ol/source/Source.js
+++ b/src/ol/source/Source.js
@@ -1,7 +1,7 @@
 /**
 * @module ol/source/Source
 */
-
+import {abstract} from '../util.js';
 import BaseObject from '../Object.js';
 import {get as getProjection} from '../proj.js';
 import SourceState from './State.js';
@@ -44,6 +44,7 @@ import SourceState from './State.js';
 * Base class for {@link module:ol/layer/Layer~Layer} sources.
 *
 * A generic `change` event is triggered when the state of the source changes.
+ * @abstract
 * @api
 */
 class Source extends BaseObject {
@@ -123,7 +124,9 @@ class Source extends BaseObject {
   * @abstract
   * @return {Array<number>|undefined} Resolutions.
   */
-  getResolutions() {}
+  getResolutions() {
+    return abstract();
+  }

  /**
   * Get the state of the source, see {@link module:ol/source/State~State} for possible states.
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -1,7 +1,7 @@
 /**
 * @module ol/source/Tile
 */
-
+import {abstract} from '../util.js';
 import TileCache from '../TileCache.js';
 import TileState from '../TileState.js';
 import Event from '../events/Event.js';
@@ -31,6 +31,7 @@ import {wrapX, getForProjection as getTileGridForProjection} from '../tilegrid.j
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for sources providing images divided into a tile grid.
+ * @abstract
 * @api
 */
 class TileSource extends Source {
@@ -199,7 +200,9 @@ class TileSource extends Source {
   * @param {import("../proj/Projection.js").default} projection Projection.
   * @return {!import("../Tile.js").default} Tile.
   */
-  getTile(z, x, y, pixelRatio, projection) {}
+  getTile(z, x, y, pixelRatio, projection) {
+    return abstract();
+  }

  /**
   * Return the tile grid of the tile source.
@@ -292,8 +295,8 @@ class TileSource extends Source {
  }

  /**
-   * @abstract
   * Marks a tile coord as being used, without triggering a load.
+   * @abstract
   * @param {number} z Tile coordinate z.
   * @param {number} x Tile coordinate x.
   * @param {number} y Tile coordinate y.
--- a/src/ol/style/Image.js
+++ b/src/ol/style/Image.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/style/Image
 */
+import {abstract} from '../util.js';


 /**
@@ -17,6 +18,7 @@
 * A base class used for creating subclasses and not instantiated in
 * apps. Base class for {@link module:ol/style/Icon~Icon}, {@link module:ol/style/Circle~CircleStyle} and
 * {@link module:ol/style/RegularShape~RegularShape}.
+ * @abstract
 * @api
 */
 class ImageStyle {
@@ -117,7 +119,9 @@ class ImageStyle {
   * @abstract
   * @return {Array<number>} Anchor.
   */
-  getAnchor() {}
+  getAnchor() {
+    return abstract();
+  }

  /**
   * Get the image element for the symbolizer.
@@ -125,46 +129,60 @@ class ImageStyle {
   * @param {number} pixelRatio Pixel ratio.
   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Image element.
   */
-  getImage(pixelRatio) {}
+  getImage(pixelRatio) {
+    return abstract();
+  }

  /**
   * @abstract
   * @param {number} pixelRatio Pixel ratio.
   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Image element.
   */
-  getHitDetectionImage(pixelRatio) {}
+  getHitDetectionImage(pixelRatio) {
+    return abstract();
+  }

  /**
   * @abstract
   * @return {import("../ImageState.js").default} Image state.
   */
-  getImageState() {}
+  getImageState() {
+    return abstract();
+  }

  /**
   * @abstract
   * @return {import("../size.js").Size} Image size.
   */
-  getImageSize() {}
+  getImageSize() {
+    return abstract();
+  }

  /**
   * @abstract
   * @return {import("../size.js").Size} Size of the hit-detection image.
   */
-  getHitDetectionImageSize() {}
+  getHitDetectionImageSize() {
+    return abstract();
+  }

  /**
   * Get the origin of the symbolizer.
   * @abstract
   * @return {Array<number>} Origin.
   */
-  getOrigin() {}
+  getOrigin() {
+    return abstract();
+  }

  /**
   * Get the size of the symbolizer (in pixels).
   * @abstract
   * @return {import("../size.js").Size} Size.
   */
-  getSize() {}
+  getSize() {
+    return abstract();
+  }

  /**
   * Set the opacity.
@@ -220,13 +238,17 @@ class ImageStyle {
   * @return {import("../events.js").EventsKey|undefined} Listener key.
   * @template T
   */
-  listenImageChange(listener, thisArg) {}
+  listenImageChange(listener, thisArg) {
+    return abstract();
+  }

  /**
   * Load not yet loaded URI.
   * @abstract
   */
-  load() {}
+  load() {
+    abstract();
+  }

  /**
   * @abstract
@@ -234,7 +256,9 @@ class ImageStyle {
   * @param {T} thisArg Value to use as `this` when executing `listener`.
   * @template T
   */
-  unlistenImageChange(listener, thisArg) {}
+  unlistenImageChange(listener, thisArg) {
+    abstract();
+  }
 }

 export default ImageStyle;
--- a/src/ol/util.js
+++ b/src/ol/util.js
@@ -2,6 +2,15 @@
 * @module ol/util
 */

+/**
+ * @return {?} Any return.
+ */
+export function abstract() {
+  return /** @type {?} */ ((function() {
+    throw new Error('Unimplemented abstract method.');
+  })());
+}
+
 /**
 * Inherit the prototype methods from one constructor into another.
 *
--- a/src/ol/webgl/Shader.js
+++ b/src/ol/webgl/Shader.js
@@ -1,6 +1,7 @@
 /**
 * @module ol/webgl/Shader
 */
+import {abstract} from '../util.js';

 /**
 * @abstract
@@ -31,7 +32,9 @@ class WebGLShader {
   * @abstract
   * @return {number} Type.
   */
-  getType() {}
+  getType() {
+    return abstract();
+  }

  /**
   * @return {string} Source.
--- a/test/spec/ol/render/webgl/index.test.js
+++ b/test/spec/ol/render/webgl/index.test.js
@@ -4,6 +4,7 @@ describe('ol.render.Replay', function() {
  let replay;
  beforeEach(function() {
    replay = new WebGLReplay(5, [-180, -90, 180, 90]);
+    replay.drawReplay = replay.shutDownProgram = function() {};
  });