diff --git a/dist/trace.js b/dist/trace.js
new file mode 100644
index 0000000..1e877c4
--- /dev/null
+++ b/dist/trace.js
@@ -0,0 +1,35 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.evaluateTrace = evaluateTrace;
+const evidence_1 = require("./evidence");
+function evaluateTrace(requirements, cases, reviewDate) {
+    const required = requirements.filter(item => item.mandatory);
+    const ids = new Set(required.map(item => item.id));
+    const usedCases = new Set(), duplicateCases = [], orphanCases = [];
+    const links = new Map();
+    for (const item of cases) {
+        if (usedCases.has(item.id)) {
+            duplicateCases.push(item.id);
+            continue;
+        }
+        usedCases.add(item.id);
+        for (const id of item.requirementIds) {
+            if (!ids.has(id)) {
+                orphanCases.push(item.id);
+                continue;
+            }
+            links.set(id, [...(links.get(id) ?? []), item]);
+        }
+    }
+    const gaps = [];
+    for (const requirement of required) {
+        const related = links.get(requirement.id) ?? [];
+        if (related.length === 0)
+            gaps.push({ requirementId: requirement.id, reason: '无验证用例' });
+        else if (!related.some(item => (0, evidence_1.evidenceState)(item, reviewDate) === null))
+            gaps.push({ requirementId: requirement.id, reason: related.map(item => (0, evidence_1.evidenceState)(item, reviewDate)).join('、') });
+    }
+    const covered = required.length - gaps.length;
+    return { covered, total: required.length, percent: required.length ? Math.round(covered * 100 / required.length) : 100,
+        gaps, orphanCases, duplicateCases };
+}