feat(sfc): support using extends interface with defineProps()

packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap

@@ -905,6 +905,33 @@ export default /*#__PURE__*/_defineComponent({
 
 
 
+return {  }
+}
+
+})"
+`;
+
+exports[`SFC compile <script setup> with TypeScript defineProps w/ extends interface 1`] = `
+"import { defineComponent as _defineComponent } from 'vue'
+interface Bar extends Foo { y?: number }
+        interface Props extends Bar {
+          z: number
+          y: string
+        }
+
+        interface Foo { x?: number }
+
+export default /*#__PURE__*/_defineComponent({
+  props: {
+    z: { type: Number, required: true },
+    y: { type: String, required: true },
+    x: { type: Number, required: false }
+  },
+  setup(__props: any, { expose }) {
+  expose()
+
+
+
 return {  }
 }
 

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

@@ -773,6 +773,31 @@ const emit = defineEmits(['a', 'b'])
       })
     })
 
+    test('defineProps w/ extends interface', () => {
+      const { content, bindings } = compile(`
+      <script lang="ts">
+        interface Foo { x?: number }
+      </script>
+      <script setup lang="ts">
+        interface Bar extends Foo { y?: number }
+        interface Props extends Bar {
+          z: number
+          y: string
+        }
+        defineProps<Props>()
+      </script>
+      `)
+      assertCode(content)
+      expect(content).toMatch(`z: { type: Number, required: true }`)
+      expect(content).toMatch(`y: { type: String, required: true }`)
+      expect(content).toMatch(`x: { type: Number, required: false }`)
+      expect(bindings).toStrictEqual({
+        x: BindingTypes.PROPS,
+        y: BindingTypes.PROPS,
+        z: BindingTypes.PROPS
+      })
+    })
+
     test('defineProps w/ exported interface', () => {
       const { content, bindings } = compile(`
       <script setup lang="ts">

packages/compiler-sfc/src/compileScript.ts

@@ -37,6 +37,7 @@ import {
   CallExpression,
   RestElement,
   TSInterfaceBody,
+  TSTypeElement,
   AwaitExpression,
   Program,
   ObjectMethod
@@ -439,6 +440,82 @@ export function compileScript(
     return true
   }
 
+  function getAstBody(): Statement[] {
+    return scriptAst
+      ? [...scriptSetupAst.body, ...scriptAst.body]
+      : scriptSetupAst.body
+  }
+
+  function resolveExtendsType(
+    node: Node,
+    qualifier: (node: Node) => boolean,
+    cache: Array<Node> = []
+  ): Array<Node> {
+    if (node.type === 'TSInterfaceDeclaration' && node.extends) {
+      node.extends.forEach(extend => {
+        if (
+          extend.type === 'TSExpressionWithTypeArguments' &&
+          extend.expression.type === 'Identifier'
+        ) {
+          const body = getAstBody()
+          for (const node of body) {
+            const qualified = isQualifiedType(
+              node,
+              qualifier,
+              extend.expression.name
+            )
+            if (qualified) {
+              cache.push(qualified)
+              resolveExtendsType(node, qualifier, cache)
+              return cache
+            }
+          }
+        }
+      })
+    }
+    return cache
+  }
+
+  function isQualifiedType(
+    node: Node,
+    qualifier: (node: Node) => boolean,
+    refName: String
+  ): Node | undefined {
+    if (node.type === 'TSInterfaceDeclaration' && node.id.name === refName) {
+      return node.body
+    } else if (
+      node.type === 'TSTypeAliasDeclaration' &&
+      node.id.name === refName &&
+      qualifier(node.typeAnnotation)
+    ) {
+      return node.typeAnnotation
+    } else if (node.type === 'ExportNamedDeclaration' && node.declaration) {
+      return isQualifiedType(node.declaration, qualifier, refName)
+    }
+  }
+
+  // filter all extends types to keep the override declaration
+  function filterExtendsType(extendsTypes: Node[], bodies: TSTypeElement[]) {
+    extendsTypes.forEach(extend => {
+      const body = (extend as TSInterfaceBody).body
+      body.forEach(newBody => {
+        if (
+          newBody.type === 'TSPropertySignature' &&
+          newBody.key.type === 'Identifier'
+        ) {
+          const name = newBody.key.name
+          const hasOverride = bodies.some(
+            seenBody =>
+              seenBody.type === 'TSPropertySignature' &&
+              seenBody.key.type === 'Identifier' &&
+              seenBody.key.name === name
+          )
+          if (!hasOverride) bodies.push(newBody)
+        }
+      })
+    })
+  }
+
   function resolveQualifiedType(
     node: Node,
     qualifier: (node: Node) => boolean
@@ -451,28 +528,20 @@ export function compileScript(
       node.typeName.type === 'Identifier'
     ) {
       const refName = node.typeName.name
-      const isQualifiedType = (node: Node): Node | undefined => {
-        if (
-          node.type === 'TSInterfaceDeclaration' &&
-          node.id.name === refName
-        ) {
-          return node.body
-        } else if (
-          node.type === 'TSTypeAliasDeclaration' &&
-          node.id.name === refName &&
-          qualifier(node.typeAnnotation)
-        ) {
-          return node.typeAnnotation
-        } else if (node.type === 'ExportNamedDeclaration' && node.declaration) {
-          return isQualifiedType(node.declaration)
-        }
-      }
-      const body = scriptAst
-        ? [...scriptSetupAst.body, ...scriptAst.body]
-        : scriptSetupAst.body
+      const body = getAstBody()
       for (const node of body) {
-        const qualified = isQualifiedType(node)
+        let qualified = isQualifiedType(
+          node,
+          qualifier,
+          refName
+        ) as TSInterfaceBody
         if (qualified) {
+          const extendsTypes = resolveExtendsType(node, qualifier)
+          if (extendsTypes.length) {
+            const bodies: TSTypeElement[] = [...qualified.body]
+            filterExtendsType(extendsTypes, bodies)
+            qualified.body = bodies
+          }
           return qualified
         }
       }