Test type intersection with reuse

api.md

@@ -1550,6 +1550,26 @@ interface Foo {
 ```
 
 
+## [type-intersection](./test/programs/type-intersection-reuse)
+
+```ts
+interface Type1 {
+    value1: string;
+    value2: number;
+}
+interface Type2 {
+    value2: number;
+    value3: boolean;
+}
+
+// Type1 can be reused, make sure value2 still works.
+interface MyObject {
+    value1: Type1;
+    value2: Type1 & Type2;
+}
+```
+
+
 ## [type-mapped-types](./test/programs/type-mapped-types)
 
 ```ts

test/programs/type-intersection-reuse/main.ts

@@ -0,0 +1,14 @@
+interface Type1 {
+    value1: string;
+    value2: number;
+}
+interface Type2 {
+    value2: number;
+    value3: boolean;
+}
+
+// Type1 can be reused, make sure value2 still works.
+interface MyObject {
+    value1: Type1;
+    value2: Type1 & Type2;
+}

test/programs/type-intersection-reuse/schema.json

@@ -0,0 +1,53 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "additionalProperties": false,
+    "definitions": {
+        "Type1": {
+            "additionalProperties": false,
+            "properties": {
+                "value1": {
+                    "type": "string"
+                },
+                "value2": {
+                    "type": "number"
+                }
+            },
+            "required": [
+                "value1",
+                "value2"
+            ],
+            "type": "object"
+        }
+    },
+    "properties": {
+        "value1": {
+            "$ref": "#/definitions/Type1"
+        },
+        "value2": {
+            "additionalProperties": false,
+            "properties": {
+                "value1": {
+                    "type": "string"
+                },
+                "value2": {
+                    "type": "number"
+                },
+                "value3": {
+                    "type": "boolean"
+                }
+            },
+            "required": [
+                "value1",
+                "value2",
+                "value3"
+            ],
+            "type": "object"
+        }
+    },
+    "required": [
+        "value1",
+        "value2"
+    ],
+    "type": "object"
+}
+

test/schema.test.ts

@@ -226,6 +226,9 @@ describe("schema", () => {
         assertSchema("type-intersection", "MyObject", {
             noExtraProps: true,
         });
+        assertSchema("type-intersection-reuse", "MyObject", {
+            noExtraProps: true,
+        });
         assertSchema("type-union-tagged", "Shape");
         assertSchema("type-aliases-union-namespace", "MyModel");
         assertSchema("type-intersection-recursive", "*");