diff --git a/cocoscreator_projects/framework-tests/legacy-layer-migration/spirit-to-node.test.mjs b/cocoscreator_projects/framework-tests/legacy-layer-migration/spirit-to-node.test.mjs
new file mode 100644
index 0000000..a3e261d
--- /dev/null
+++ b/cocoscreator_projects/framework-tests/legacy-layer-migration/spirit-to-node.test.mjs
@@ -0,0 +1,56 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { mapSpiritTypeToComponent } from '../../scripts/legacy-layer-to-cocos-prefab.mjs';
+
+// 绝对路径 -- tests 从 cocoscreator_projects/ 运行, 相对路径会解析到仓库根,
+// 漏掉 cocoscreator_projects/ 段导致 ENOENT (Task 2 fix round 1 Finding 3).
+const SEMANTICS = JSON.parse(readFileSync(
+  'G:/Works/YouleGamesCocosCreator/cocoscreator_projects/framework-tests/legacy-layer-migration/fixtures/spirit-semantics.json',
+  'utf8'
+));
+
+test('type=0 → cc.Sprite', () => {
+  assert.equal(mapSpiritTypeToComponent('0'), 'cc.Sprite');
+});
+
+test('type=1 → cc.Label', () => {
+  assert.equal(mapSpiritTypeToComponent('1'), 'cc.Label');
+});
+
+test('type=3 → cc.ProgressBar', () => {
+  assert.equal(mapSpiritTypeToComponent('3'), 'cc.ProgressBar');
+});
+
+test('type=4 → 已知组件（不能是 unknown）', () => {
+  // 数据源权威: SpiritType 4 已在 fixtures/spirit-semantics.json 逆向为 cc.EditBox (Task 5).
+  assert.notEqual(mapSpiritTypeToComponent('4'), 'unknown');
+});
+
+test('type=5 → 已知组件（不能是 unknown）', () => {
+  // 数据源权威: SpiritType 5 已在 fixtures/spirit-semantics.json 逆向为 cc.Sprite (SLICED) (Task 5).
+  assert.notEqual(mapSpiritTypeToComponent('5'), 'unknown');
+});
+
+test('未知 type → throw（不静默兜底）', () => {
+  // 数据源权威唯一、下游不兜底: 未知 SpiritType 必须显式报错.
+  assert.throws(() => mapSpiritTypeToComponent('99'), /Unknown SpiritType/);
+});
+
+test('fixtures 中 component="unknown" 的 type 也必须 throw（safety net for Task 5 未完成时）', () => {
+  // 若 Task 5 留有 spirit_types[*].component === 'unknown' 的条目,
+  // mapSpiritTypeToComponent 必须 throw 而非静默返回 'unknown'.
+  // 当前 fixtures 全部 5 项已逆向完成 (Type 0/1/3/4/5 均有 component),
+  // 该测试作为 future regression safety net 自动通过.
+  for (const [type, entry] of Object.entries(SEMANTICS.spirit_types)) {
+    if (entry.component === 'unknown') {
+      assert.throws(
+        () => mapSpiritTypeToComponent(type),
+        new RegExp(`SpiritType "${type}" component not yet reverse-engineered`)
+      );
+    }
+  }
+  // 当前 fixtures 5/5 全部已逆向, 循环不触发 throw, 测试通过.
+  assert.equal(Object.keys(SEMANTICS.spirit_types).length, 5,
+    'fixtures 期望 5 个 SpiritType (0/1/3/4/5) 全部已逆向');
+});
diff --git a/cocoscreator_projects/scripts/legacy-layer-to-cocos-prefab.mjs b/cocoscreator_projects/scripts/legacy-layer-to-cocos-prefab.mjs
index ba30514..1f6544b 100644
--- a/cocoscreator_projects/scripts/legacy-layer-to-cocos-prefab.mjs
+++ b/cocoscreator_projects/scripts/legacy-layer-to-cocos-prefab.mjs
@@ -1,6 +1,23 @@
 import { readFileSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
 import { DOMParser } from '@xmldom/xmldom';
 
+// SpiritType → cc.* 组件映射表 (数据源). 读取 fixtures/spirit-semantics.json,
+// 该文件由 Task 5 (gameabc.min.js 逆向) 维护, 下游不得兜底.
+// 路径: scripts/legacy-layer-to-cocos-prefab.mjs → ../framework-tests/legacy-layer-migration/fixtures/spirit-semantics.json
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const SEMANTICS_PATH = join(
+  __dirname,
+  '../framework-tests/legacy-layer-migration/fixtures/spirit-semantics.json'
+);
+
+let _semantics = null;
+function loadSemantics() {
+  if (!_semantics) _semantics = JSON.parse(readFileSync(SEMANTICS_PATH, 'utf8'));
+  return _semantics;
+}
+
 /**
  * 读取 Game_Surface_3 风格的 Layer XML (UTF-8 编码), 解析 Layer + Spirit 字段.
  *
@@ -137,3 +154,25 @@ export function buildGroupParents(spirits) {
 
   return { groupParents, rootChildSpiritIds };
 }
+
+/**
+ * 将 SpiritType (XML 中的字符串 "0"-"5") 映射到 Cocos 组件类名.
+ *
+ * 数据源权威唯一: 读取 fixtures/spirit-semantics.json (Task 5 逆向产出);
+ * 下游不兜底 — 未知 type 或 component="unknown" 一律 throw, 不静默返回 fallback.
+ *
+ * @param {string} type - SpiritType 字符串 (e.g. "0", "1", "3", "4", "5")
+ * @returns {string} Cocos 组件类名 (e.g. "cc.Sprite", "cc.Label", "cc.ProgressBar", "cc.EditBox")
+ * @throws {Error} 未知 SpiritType 或 component 字段为 "unknown" 时抛错
+ */
+export function mapSpiritTypeToComponent(type) {
+  const semantics = loadSemantics();
+  const entry = semantics.spirit_types[type];
+  if (!entry) {
+    throw new Error(`Unknown SpiritType "${type}" - not in fixtures/spirit-semantics.json`);
+  }
+  if (entry.component === 'unknown') {
+    throw new Error(`SpiritType "${type}" component not yet reverse-engineered - complete Task 5 (gameabc.min.js 逆向) first`);
+  }
+  return entry.component;
+}