fix(compiler-sfc): handle keyof operator with index object (#11581)

packages/compiler-sfc/__tests__/compileScript/resolveType.spec.ts

@@ -596,6 +596,65 @@ describe('resolveType', () => {
     })
   })
 
+  test('keyof: nested object with number', () => {
+    const { props } = resolve(
+      `
+      interface Type {
+        deep: {
+          1: any
+        }
+      }
+
+      defineProps<{
+        route: keyof Type['deep']
+      }>()`,
+    )
+
+    expect(props).toStrictEqual({
+      route: ['Number'],
+    })
+  })
+
+  test('keyof: nested object with string', () => {
+    const { props } = resolve(
+      `
+      interface Type {
+        deep: {
+          foo: any
+        }
+      }
+
+      defineProps<{
+        route: keyof Type['deep']
+      }>()`,
+    )
+
+    expect(props).toStrictEqual({
+      route: ['String'],
+    })
+  })
+
+  test('keyof: nested object with intermediate', () => {
+    const { props } = resolve(
+      `
+      interface Type {
+        deep: {
+          foo: any
+        }
+      }
+
+      type Foo = Type['deep']
+
+      defineProps<{
+        route: keyof Foo
+      }>()`,
+    )
+
+    expect(props).toStrictEqual({
+      route: ['String'],
+    })
+  })
+
   test('ExtractPropTypes (element-plus)', () => {
     const { props, raw } = resolve(
       `

packages/compiler-sfc/src/script/resolveType.ts

@@ -1703,7 +1703,7 @@ export function inferRuntimeType(
 
       case 'TSIndexedAccessType': {
         const types = resolveIndexType(ctx, node, scope)
-        return flattenTypes(ctx, types, scope)
+        return flattenTypes(ctx, types, scope, isKeyOf)
       }
 
       case 'ClassDeclaration':