fix(quadrant): make quadrant options optional

Make the types of the options in QuadrantChartConfig in the
MermaidConfig optional. All of these (except for the values in
`BaseDiagramConfig`) will be automatically set to their
default values, so they're optional from a user perspective.

packages/mermaid/src/config.type.ts

@@ -229,24 +229,24 @@ export interface PieDiagramConfig extends BaseDiagramConfig {
 }
 
 export interface QuadrantChartConfig extends BaseDiagramConfig {
-  chartWidth: number;
-  chartHeight: number;
-  titleFontSize: number;
-  titlePadding: number;
-  quadrantPadding: number;
-  xAxisLabelPadding: number;
-  yAxisLabelPadding: number;
-  xAxisLabelFontSize: number;
-  yAxisLabelFontSize: number;
-  quadrantLabelFontSize: number;
-  quadrantTextTopPadding: number;
-  pointTextPadding: number;
-  pointLabelFontSize: number;
-  pointRadius: number;
-  xAxisPosition: 'top' | 'bottom';
-  yAxisPosition: 'left' | 'right';
-  quadrantInternalBorderStrokeWidth: number;
-  quadrantExternalBorderStrokeWidth: number;
+  chartWidth?: number;
+  chartHeight?: number;
+  titleFontSize?: number;
+  titlePadding?: number;
+  quadrantPadding?: number;
+  xAxisLabelPadding?: number;
+  yAxisLabelPadding?: number;
+  xAxisLabelFontSize?: number;
+  yAxisLabelFontSize?: number;
+  quadrantLabelFontSize?: number;
+  quadrantTextTopPadding?: number;
+  pointTextPadding?: number;
+  pointLabelFontSize?: number;
+  pointRadius?: number;
+  xAxisPosition?: 'top' | 'bottom';
+  yAxisPosition?: 'left' | 'right';
+  quadrantInternalBorderStrokeWidth?: number;
+  quadrantExternalBorderStrokeWidth?: number;
 }
 
 export interface ErDiagramConfig extends BaseDiagramConfig {

packages/mermaid/src/diagrams/quadrant-chart/quadrantBuilder.ts

@@ -1,7 +1,7 @@
 // @ts-ignore: TODO Fix ts errors
 import { scaleLinear } from 'd3';
 import { log } from '../../logger.js';
-import { QuadrantChartConfig } from '../../config.type.js';
+import type { BaseDiagramConfig, QuadrantChartConfig } from '../../config.type.js';
 import defaultConfig from '../../defaultConfig.js';
 import { getThemeVariables } from '../../themes/theme-default.js';
 
@@ -71,7 +71,8 @@ export interface quadrantBuilderData {
   points: QuadrantPointInputType[];
 }
 
-export interface QuadrantBuilderConfig extends QuadrantChartConfig {
+export interface QuadrantBuilderConfig
+  extends Required<Omit<QuadrantChartConfig, keyof BaseDiagramConfig>> {
   showXAxis: boolean;
   showYAxis: boolean;
   showTitle: boolean;