Allow spanGaps to be specified on LineOptions

docs/charts/line.md

@@ -135,7 +135,7 @@ The style of the line can be controlled with the following properties:
 | `showLine` | If false, the line is not drawn for this dataset.
 | `spanGaps` | If true, lines will be drawn between points with no or null data. If false, points with `null` data will create a break in the line. Can also be a number specifying the maximum gap length to span. The unit of the value depends on the scale used.
 
-If the value is `undefined`, `showLine` and `spanGaps` fallback to the associated [chart configuration options](#configuration-options). The rest of the values fallback to the associated [`elements.line.*`](../configuration/elements.md#line-configuration) options.
+If the value is `undefined`, the values fallback to the associated [`elements.line.*`](../configuration/elements.md#line-configuration) options.
 
 ### Interactions
 

docs/charts/radar.md

@@ -150,7 +150,7 @@ The style of the line can be controlled with the following properties:
 | `tension` | Bezier curve tension of the line. Set to 0 to draw straight lines.
 | `spanGaps` | If true, lines will be drawn between points with no or null data. If false, points with `null` data will create a break in the line.
 
-If the value is `undefined`, `spanGaps` fallback to the associated [chart configuration options](#configuration-options). The rest of the values fallback to the associated [`elements.line.*`](../configuration/elements.md#line-configuration) options.
+If the value is `undefined`, the values fallback to the associated [`elements.line.*`](../configuration/elements.md#line-configuration) options.
 
 ### Interactions
 

types/index.esm.d.ts

@@ -1787,6 +1787,10 @@ export interface LineOptions extends CommonElementOptions {
    * Both line and radar charts support a fill option on the dataset object which can be used to create area between two datasets or a dataset and a boundary, i.e. the scale origin, start or end
    */
   fill: FillTarget | ComplexFillTarget;
+  /**
+   * If true, lines will be drawn between points with no or null data. If false, points with NaN data will create a break in the line. Can also be a number specifying the maximum gap length to span. The unit of the value depends on the scale used.
+   */
+  spanGaps: boolean | number;
 
   segment: {
     backgroundColor: Scriptable<Color|undefined, ScriptableLineSegmentContext>,

types/tests/controllers/line_span_gaps.ts

@@ -0,0 +1,32 @@
+import { Chart } from '../../index.esm';
+
+const chart = new Chart('id', {
+  type: "line",
+  data: {
+    datasets: [
+      {
+        label: "Cats",
+        data: [],
+      }
+    ]
+  },
+  options: {
+    elements: {
+      line: {
+        spanGaps: true
+      }
+    },
+    scales: {
+      x: {
+        type: "linear",
+        min: 1,
+        max: 10
+      },
+      y: {
+        type: "linear",
+        min: 0,
+        max: 50
+      }
+    }
+  }
+});