Use null when decoration options are not defined

src/vs/editor/common/model/textModel.ts

@@ -2841,19 +2841,19 @@ export class ModelDecorationOptions implements model.IModelDecorationOptions {
 	private constructor(options: model.IModelDecorationOptions) {
 		this.stickiness = options.stickiness || model.TrackedRangeStickiness.AlwaysGrowsWhenTypingAtEdges;
 		this.zIndex = options.zIndex || 0;
-		this.className = options.className ? cleanClassName(options.className) : strings.empty;
-		this.hoverMessage = options.hoverMessage || [];
-		this.glyphMarginHoverMessage = options.glyphMarginHoverMessage || [];
+		this.className = options.className ? cleanClassName(options.className) : null;
+		this.hoverMessage = options.hoverMessage || null;
+		this.glyphMarginHoverMessage = options.glyphMarginHoverMessage || null;
 		this.isWholeLine = options.isWholeLine || false;
 		this.showIfCollapsed = options.showIfCollapsed || false;
 		this.overviewRuler = new ModelDecorationOverviewRulerOptions(options.overviewRuler);
-		this.glyphMarginClassName = options.glyphMarginClassName ? cleanClassName(options.glyphMarginClassName) : strings.empty;
-		this.linesDecorationsClassName = options.linesDecorationsClassName ? cleanClassName(options.linesDecorationsClassName) : strings.empty;
-		this.marginClassName = options.marginClassName ? cleanClassName(options.marginClassName) : strings.empty;
-		this.inlineClassName = options.inlineClassName ? cleanClassName(options.inlineClassName) : strings.empty;
+		this.glyphMarginClassName = options.glyphMarginClassName ? cleanClassName(options.glyphMarginClassName) : null;
+		this.linesDecorationsClassName = options.linesDecorationsClassName ? cleanClassName(options.linesDecorationsClassName) : null;
+		this.marginClassName = options.marginClassName ? cleanClassName(options.marginClassName) : null;
+		this.inlineClassName = options.inlineClassName ? cleanClassName(options.inlineClassName) : null;
 		this.inlineClassNameAffectsLetterSpacing = options.inlineClassNameAffectsLetterSpacing || false;
-		this.beforeContentClassName = options.beforeContentClassName ? cleanClassName(options.beforeContentClassName) : strings.empty;
-		this.afterContentClassName = options.afterContentClassName ? cleanClassName(options.afterContentClassName) : strings.empty;
+		this.beforeContentClassName = options.beforeContentClassName ? cleanClassName(options.beforeContentClassName) : null;
+		this.afterContentClassName = options.afterContentClassName ? cleanClassName(options.afterContentClassName) : null;
 	}
 }
 ModelDecorationOptions.EMPTY = ModelDecorationOptions.register({});