feat(a11y-check): add severity detection for violations

Author: YusukeHirao

packages/@d-zero/a11y-check-axe-scenario/src/convert-results-from-violations.ts

@@ -5,6 +5,7 @@ import type { Page } from 'puppeteer';
 
 import { convertResultsFromNode } from './convert-results-from-node.js';
 import { detectLevel } from './detect-level.js';
+import { detectSeverity } from './detect-severity.js';
 import { inferExplanation } from './infer-explanation.js';
 import { p } from './paragraph.js';
 import { tagsToSCs } from './tags-to-scs.js';
@@ -64,6 +65,7 @@ export async function convertResultsFromViolations(
 				wcagVersion: violation.tags.includes('wcag2a') ? 'WCAG2.0' : 'WCAG2.1',
 				scNumber: tagsToSCs(violation.tags),
 				level: detectLevel(violation.tags),
+				severity: detectSeverity(violation.impact),
 				screenshot: nodeResult?.screenshot ?? null,
 			});
 		}

packages/@d-zero/a11y-check-axe-scenario/src/detect-severity.ts

@@ -0,0 +1,25 @@
+/**
+ *
+ * @param impact
+ */
+export function detectSeverity(
+	impact?: 'serious' | 'minor' | 'moderate' | 'critical' | null,
+): 'high' | 'medium' | 'low' | null {
+	if (!impact) {
+		return null;
+	}
+	switch (impact) {
+		case 'serious': {
+			return 'high';
+		}
+		case 'minor': {
+			return 'medium';
+		}
+		case 'moderate': {
+			return 'low';
+		}
+		case 'critical': {
+			return 'high';
+		}
+	}
+}

packages/@d-zero/a11y-check-core/src/types.ts

@@ -65,6 +65,7 @@ export type Violation = ResultData & {
 	readonly wcagVersion: string | null;
 	readonly scNumber: string | null;
 	readonly level: 'A' | 'AA' | 'AAA' | null;
+	readonly severity: 'high' | 'medium' | 'low' | null;
 	readonly screenshot: string | null;
 };
 

packages/@d-zero/a11y-check/src/spreadsheet.ts

@@ -44,6 +44,7 @@ export class SpreadsheetReporter {
 					wcagVersion: { value: result.wcagVersion },
 					scNumber: { value: result.scNumber },
 					level: { value: result.level },
+					severity: { value: result.severity },
 					screenshot: { value: result.screenshot },
 				};
 			}),
@@ -111,6 +112,7 @@ export class SpreadsheetReporter {
 					wcagVersion: 'WCAGバージョン',
 					scNumber: '達成基準番号',
 					level: '適合レベル',
+					severity: '深刻度',
 					screenshot: 'スクリーンショット',
 				},
 			},