allow nonce values for style elements

src/apexcharts.js

@@ -84,6 +84,10 @@ export default class ApexCharts {
             this.css = document.createElement('style')
             this.css.id = 'apexcharts-css'
             this.css.textContent = apexCSS
+            const nonce = this.opts.chart?.nonce || this.w.config.chart.nonce;
+            if (nonce) {
+              this.css.setAttribute('nonce', nonce);
+            }
 
             if (inShadowRoot) {
               // We are in Shadow DOM, add to shadow root

src/modules/legend/Helpers.js

@@ -10,6 +10,10 @@ export default class Helpers {
   getLegendStyles() {
     let stylesheet = document.createElement('style')
     stylesheet.setAttribute('type', 'text/css')
+    const nonce = this.lgCtx.ctx?.opts?.chart?.nonce || this.w.config.chart.nonce;
+    if (nonce) {
+      stylesheet.setAttribute('nonce', nonce);
+    }
 
     const text = `	
 

src/modules/settings/Options.js

@@ -310,6 +310,7 @@ export default class Options {
         redrawOnWindowResize: true,
         id: undefined,
         group: undefined,
+        nonce: undefined,
         offsetX: 0,
         offsetY: 0,
         selection: {

tests/unit/nonce.spec.js

@@ -0,0 +1,91 @@
+import { createChartWithOptions } from './utils/utils.js'
+
+describe('chart.nonce option', () => {
+  beforeEach(() => {
+    window.Apex = {};
+  });
+  afterEach(() => {
+    document.getElementsByTagName('html')[0].innerHTML = ''
+  })
+
+  it('undefined (default) will not render a nonce attribute', () => {
+    createChartWithOptions({
+      series: [
+        {
+          name: "A",
+          data: [
+            [1, 1],
+            [4, 4],
+            [3, 3],
+          ],
+        },
+        {
+          name: "B",
+          data: [
+            [2, 2],
+            [5, 5],
+            [6, 6],
+          ],
+        },
+      ],
+      chart: {
+        type: 'bar',
+      },
+    })
+    expect(document.head.querySelectorAll('#apexcharts-css').length).toBe(1)
+    expect(
+      document.head.querySelectorAll('#apexcharts-css[nonce]').length
+    ).toBe(0)
+    expect(document.body.querySelectorAll('foreignObject style').length).toBe(1)
+  })
+
+  it('will render a nonce attribute when provided as an option', () => {
+    createChartWithOptions({
+      series: [
+        {
+          data: [
+            [1, 1],
+            [4, 4],
+            [3, 3],
+          ],
+        },
+      ],
+      chart: {
+        type: 'bar',
+        nonce: 'noncevalue1',
+      },
+    })
+    expect(document.head.querySelectorAll('#apexcharts-css').length).toBe(1)
+    expect(
+      document.head.querySelectorAll("#apexcharts-css[nonce='noncevalue1']")
+        .length
+    ).toBe(1)
+  })
+
+  it('will render a nonce attribute when defined as a global config', () => {
+    window.Apex = {
+      chart: {
+        nonce: 'noncevalue2'
+      }
+    };
+    createChartWithOptions({
+      series: [
+        {
+          data: [
+            [1, 1],
+            [4, 4],
+            [3, 3],
+          ],
+        },
+      ],
+      chart: {
+        type: 'bar',
+      },
+    })
+    expect(document.head.querySelectorAll('#apexcharts-css').length).toBe(1)
+    expect(
+      document.head.querySelectorAll("#apexcharts-css[nonce='noncevalue2']")
+        .length
+    ).toBe(1)
+  })
+})