refactor(frontend): scripts -> utility

packages/frontend/src/utility/chart-legend.ts

@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { Plugin } from 'chart.js';
+import MkChartLegend from '@/components/MkChartLegend.vue';
+
+export const chartLegend = (legend: InstanceType<typeof MkChartLegend>) => ({
+	id: 'htmlLegend',
+	afterUpdate(chart, args, options) {
+		// Reuse the built-in legendItems generator
+		const items = chart.options.plugins.legend.labels.generateLabels(chart);
+
+		legend.update(chart, items);
+	},
+}) as Plugin;