feat: implement inheritAttrs

packages/compiler-vapor/__tests__/generators/__snapshots__/component.spec.ts.snap

@@ -0,0 +1,44 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`generate component > generate multi root component 1`] = `
+"import { resolveComponent as _resolveComponent, createComponent as _createComponent, template as _template } from 'vue/vapor';
+const t0 = _template("123")
+
+export function render(_ctx) {
+  const n1 = t0()
+  const n0 = _createComponent(_resolveComponent("Comp"))
+  return [n0, n1]
+}"
+`;
+
+exports[`generate component > generate single root component (with props) 1`] = `
+"import { resolveComponent as _resolveComponent, createComponent as _createComponent } from 'vue/vapor';
+
+export function render(_ctx) {
+  const n0 = _createComponent(_resolveComponent("Comp"), [{
+    foo: () => (foo)
+  }], true)
+  return n0
+}"
+`;
+
+exports[`generate component > generate single root component (without props) 1`] = `
+"import { resolveComponent as _resolveComponent, createComponent as _createComponent } from 'vue/vapor';
+
+export function render(_ctx) {
+  const n0 = _createComponent(_resolveComponent("Comp"), null, true)
+  return n0
+}"
+`;
+
+exports[`generate component > should not generate withAttrs if component is not the root of the template 1`] = `
+"import { resolveComponent as _resolveComponent, createComponent as _createComponent, insert as _insert, template as _template } from 'vue/vapor';
+const t0 = _template("<div></div>")
+
+export function render(_ctx) {
+  const n1 = t0()
+  const n0 = _createComponent(_resolveComponent("Comp"))
+  _insert(n0, n1)
+  return n1
+}"
+`;

packages/compiler-vapor/__tests__/generators/component.spec.ts

@@ -0,0 +1,23 @@
+import { compile } from '@vue/compiler-vapor'
+
+describe('generate component', () => {
+  test('generate single root component (without props)', () => {
+    const { code } = compile(`<Comp/>`)
+    expect(code).toMatchSnapshot()
+  })
+
+  test('generate single root component (with props)', () => {
+    const { code } = compile(`<Comp :foo="foo"/>`)
+    expect(code).toMatchSnapshot()
+  })
+
+  test('generate multi root component', () => {
+    const { code } = compile(`<Comp/>123`)
+    expect(code).toMatchSnapshot()
+  })
+
+  test('should not generate withAttrs if component is not the root of the template', () => {
+    const { code } = compile(`<div><Comp/></div>`)
+    expect(code).toMatchSnapshot()
+  })
+})

packages/compiler-vapor/src/generators/component.ts

@@ -22,10 +22,18 @@ export function genCreateComponent(
     ? genCall(vaporHelper('resolveComponent'), JSON.stringify(oper.tag))
     : [oper.tag]
 
+  const isRoot = oper.root
+  const props = genProps()
+
   return [
     NEWLINE,
     `const n${oper.id} = `,
-    ...genCall(vaporHelper('createComponent'), tag, genProps()),
+    ...genCall(
+      vaporHelper('createComponent'),
+      tag,
+      props || (isRoot ? 'null' : false),
+      isRoot && 'true',
+    ),
   ]
 
   function genProps() {

packages/compiler-vapor/src/ir.ts

@@ -182,6 +182,7 @@ export interface CreateComponentIRNode extends BaseIRNode {
   // TODO slots
 
   resolve: boolean
+  root: boolean
 }
 
 export type IRNode = OperationNode | RootIRNode

packages/compiler-vapor/src/transforms/transformElement.ts

@@ -64,13 +64,16 @@ function transformComponentElement(
   const { bindingMetadata } = context.options
   const resolve = !bindingMetadata[tag]
   context.dynamic.flags |= DynamicFlag.NON_TEMPLATE | DynamicFlag.INSERT
+  const root =
+    context.root === context.parent && context.parent.node.children.length === 1
 
   context.registerOperation({
     type: IRNodeTypes.CREATE_COMPONENT_NODE,
     id: context.reference(),
     tag,
     props: propsResult[0] ? propsResult[1] : [propsResult[1]],
     resolve,
+    root,
   })
 }
 

packages/runtime-vapor/__tests__/componentAttrs.spec.ts

@@ -0,0 +1,163 @@
+import {
+  createComponent,
+  getCurrentInstance,
+  nextTick,
+  ref,
+  setText,
+  template,
+  watchEffect,
+} from '../src'
+import { setCurrentInstance } from '../src/component'
+import { makeRender } from './_utils'
+
+const define = makeRender<any>()
+
+describe('attribute fallthrough', () => {
+  it('should allow attrs to fallthrough', async () => {
+    const t0 = template('<div>')
+    const { component: Child } = define({
+      props: ['foo'],
+      render() {
+        const instance = getCurrentInstance()!
+        const n0 = t0()
+        watchEffect(() => setText(n0, instance.props.foo))
+        return n0
+      },
+    })
+
+    const foo = ref(1)
+    const id = ref('a')
+    const { instance, host } = define({
+      setup() {
+        return { foo, id }
+      },
+      render(_ctx: Record<string, any>) {
+        return createComponent(
+          Child,
+          [
+            {
+              foo: () => _ctx.foo,
+              id: () => _ctx.id,
+            },
+          ],
+          true,
+        )
+      },
+    }).render()
+    const reset = setCurrentInstance(instance)
+    expect(host.innerHTML).toBe('<div id="a">1</div>')
+
+    foo.value++
+    await nextTick()
+    expect(host.innerHTML).toBe('<div id="a">2</div>')
+
+    id.value = 'b'
+    await nextTick()
+    expect(host.innerHTML).toBe('<div id="b">2</div>')
+    reset()
+  })
+
+  it('should not fallthrough if explicitly pass inheritAttrs: false', async () => {
+    const t0 = template('<div>')
+    const { component: Child } = define({
+      props: ['foo'],
+      inheritAttrs: false,
+      render() {
+        const instance = getCurrentInstance()!
+        const n0 = t0()
+        watchEffect(() => setText(n0, instance.props.foo))
+        return n0
+      },
+    })
+
+    const foo = ref(1)
+    const id = ref('a')
+    const { instance, host } = define({
+      setup() {
+        return { foo, id }
+      },
+      render(_ctx: Record<string, any>) {
+        return createComponent(
+          Child,
+          [
+            {
+              foo: () => _ctx.foo,
+              id: () => _ctx.id,
+            },
+          ],
+          true,
+        )
+      },
+    }).render()
+    const reset = setCurrentInstance(instance)
+    expect(host.innerHTML).toBe('<div>1</div>')
+
+    foo.value++
+    await nextTick()
+    expect(host.innerHTML).toBe('<div>2</div>')
+
+    id.value = 'b'
+    await nextTick()
+    expect(host.innerHTML).toBe('<div>2</div>')
+    reset()
+  })
+
+  it('should pass through attrs in nested single root components', async () => {
+    const t0 = template('<div>')
+    const { component: Grandson } = define({
+      props: ['custom-attr'],
+      render() {
+        const instance = getCurrentInstance()!
+        const n0 = t0()
+        watchEffect(() => setText(n0, instance.attrs.foo))
+        return n0
+      },
+    })
+
+    const { component: Child } = define({
+      render() {
+        const n0 = createComponent(
+          Grandson,
+          [
+            {
+              'custom-attr': () => 'custom-attr',
+            },
+          ],
+          true,
+        )
+        return n0
+      },
+    })
+
+    const foo = ref(1)
+    const id = ref('a')
+    const { instance, host } = define({
+      setup() {
+        return { foo, id }
+      },
+      render(_ctx: Record<string, any>) {
+        return createComponent(
+          Child,
+          [
+            {
+              foo: () => _ctx.foo,
+              id: () => _ctx.id,
+            },
+          ],
+          true,
+        )
+      },
+    }).render()
+    const reset = setCurrentInstance(instance)
+    expect(host.innerHTML).toBe('<div foo="1" id="a">1</div>')
+
+    foo.value++
+    await nextTick()
+    expect(host.innerHTML).toBe('<div foo="2" id="a">2</div>')
+
+    id.value = 'b'
+    await nextTick()
+    expect(host.innerHTML).toBe('<div foo="2" id="b">2</div>')
+    reset()
+  })
+})

packages/runtime-vapor/__tests__/componentProps.spec.ts

@@ -238,24 +238,26 @@ describe('component: props', () => {
         return { foo, id }
       },
       render(_ctx: Record<string, any>) {
-        return createComponent(Child, {
-          foo: () => _ctx.foo,
-          id: () => _ctx.id,
-        })
+        return createComponent(
+          Child,
+          {
+            foo: () => _ctx.foo,
+            id: () => _ctx.id,
+          },
+          true,
+        )
       },
     }).render()
     const reset = setCurrentInstance(instance)
-    // expect(host.innerHTML).toBe('<div id="a">1</div>') // TODO: Fallthrough Attributes
-    expect(host.innerHTML).toBe('<div>1</div>')
+    expect(host.innerHTML).toBe('<div id="a">1</div>')
 
     foo.value++
     await nextTick()
-    // expect(host.innerHTML).toBe('<div id="a">2</div>') // TODO: Fallthrough Attributes
-    expect(host.innerHTML).toBe('<div>2</div>')
+    expect(host.innerHTML).toBe('<div id="a">2</div>')
 
     id.value = 'b'
     await nextTick()
-    // expect(host.innerHTML).toBe('<div id="b">2</div>') // TODO: Fallthrough Attributes
+    expect(host.innerHTML).toBe('<div id="b">2</div>')
     reset()
   })
 
@@ -441,6 +443,7 @@ describe('component: props', () => {
   // #5016
   test('handling attr with undefined value', () => {
     const { render, host } = define({
+      inheritAttrs: false,
       render() {
         const instance = getCurrentInstance()!
         const t0 = template('<div></div>')

packages/runtime-vapor/src/apiCreateComponent.ts

@@ -5,14 +5,22 @@ import {
 } from './component'
 import { setupComponent } from './apiRender'
 import type { RawProps } from './componentProps'
+import { withAttrs } from './componentAttrs'
 
-export function createComponent(comp: Component, rawProps: RawProps = null) {
+export function createComponent(
+  comp: Component,
+  rawProps: RawProps | null = null,
+  singleRoot: boolean = false,
+) {
   const current = currentInstance!
-  const instance = createComponentInstance(comp, rawProps)
-  setupComponent(instance)
+  const instance = createComponentInstance(
+    comp,
+    singleRoot ? withAttrs(rawProps) : rawProps,
+  )
+  setupComponent(instance, singleRoot)
 
   // register sub-component with current component for lifecycle management
   current.comps.add(instance)
 
-  return instance.block
+  return instance
 }

packages/runtime-vapor/src/apiCreateFor.ts

@@ -4,6 +4,7 @@ import { createComment, createTextNode, insert, remove } from './dom/element'
 import { renderEffect } from './renderEffect'
 import { type Block, type Fragment, fragmentKey } from './apiRender'
 import { warn } from './warning'
+import { componentKey } from './component'
 
 interface ForBlock extends Fragment {
   scope: EffectScope
@@ -343,6 +344,8 @@ function normalizeAnchor(node: Block): Node {
     return node
   } else if (isArray(node)) {
     return normalizeAnchor(node[0])
+  } else if (componentKey in node) {
+    return normalizeAnchor(node.block!)
   } else {
     return normalizeAnchor(node.nodes!)
   }

packages/runtime-vapor/src/apiRender.ts

@@ -1,21 +1,29 @@
 import { isArray, isFunction, isObject } from '@vue/shared'
-import { type ComponentInternalInstance, setCurrentInstance } from './component'
+import {
+  type ComponentInternalInstance,
+  componentKey,
+  setCurrentInstance,
+} from './component'
 import { insert, querySelector, remove } from './dom/element'
 import { flushPostFlushCbs, queuePostRenderEffect } from './scheduler'
 import { proxyRefs } from '@vue/reactivity'
 import { invokeLifecycle } from './componentLifecycle'
 import { VaporLifecycleHooks } from './apiLifecycle'
+import { fallThroughAttrs } from './componentAttrs'
 
 export const fragmentKey = Symbol(__DEV__ ? `fragmentKey` : ``)
 
-export type Block = Node | Fragment | Block[]
+export type Block = Node | Fragment | ComponentInternalInstance | Block[]
 export type Fragment = {
   nodes: Block
   anchor?: Node
   [fragmentKey]: true
 }
 
-export function setupComponent(instance: ComponentInternalInstance): void {
+export function setupComponent(
+  instance: ComponentInternalInstance,
+  singleRoot: boolean = false,
+): void {
   const reset = setCurrentInstance(instance)
   instance.scope.run(() => {
     const { component, props, emit, attrs } = instance
@@ -30,9 +38,10 @@ export function setupComponent(instance: ComponentInternalInstance): void {
       stateOrNode &&
       (stateOrNode instanceof Node ||
         isArray(stateOrNode) ||
-        (stateOrNode as any)[fragmentKey])
+        fragmentKey in stateOrNode ||
+        componentKey in stateOrNode)
     ) {
-      block = stateOrNode as Block
+      block = stateOrNode
     } else if (isObject(stateOrNode)) {
       instance.setupState = proxyRefs(stateOrNode)
     }
@@ -47,7 +56,9 @@ export function setupComponent(instance: ComponentInternalInstance): void {
       // TODO: warn no template
       block = []
     }
-    return (instance.block = block)
+    instance.block = block
+    if (singleRoot) fallThroughAttrs(instance)
+    return block
   })
   reset()
 }

packages/runtime-vapor/src/component.ts

@@ -28,6 +28,7 @@ export type FunctionalComponent = SetupFn & Omit<ObjectComponent, 'setup'>
 
 export interface ObjectComponent {
   props?: ComponentPropsOptions
+  inheritAttrs?: boolean
   emits?: EmitsOptions
   setup?: SetupFn
   render?(ctx: any): Block
@@ -36,7 +37,10 @@ export interface ObjectComponent {
 
 type LifecycleHook<TFn = Function> = TFn[] | null
 
+export const componentKey = Symbol(__DEV__ ? `componentKey` : ``)
+
 export interface ComponentInternalInstance {
+  [componentKey]: true
   uid: number
   vapor: true
 
@@ -143,6 +147,7 @@ export function createComponentInstance(
   rawProps: RawProps | null,
 ): ComponentInternalInstance {
   const instance: ComponentInternalInstance = {
+    [componentKey]: true,
     uid: uid++,
     vapor: true,
 

packages/runtime-vapor/src/componentAttrs.ts

@@ -1,6 +1,9 @@
-import { camelize, isFunction } from '@vue/shared'
-import type { ComponentInternalInstance } from './component'
+import { camelize, isArray, isFunction } from '@vue/shared'
+import { type ComponentInternalInstance, currentInstance } from './component'
 import { isEmitListener } from './componentEmits'
+import { setDynamicProps } from './dom/prop'
+import type { RawProps } from './componentProps'
+import { renderEffect } from './renderEffect'
 
 export function patchAttrs(instance: ComponentInternalInstance) {
   const attrs = instance.attrs
@@ -42,3 +45,26 @@ export function patchAttrs(instance: ComponentInternalInstance) {
     }
   }
 }
+
+export function withAttrs(props: RawProps): RawProps {
+  const instance = currentInstance!
+  if (instance.component.inheritAttrs === false) return props
+  const attrsGetter = () => instance.attrs
+  if (!props) return [attrsGetter]
+  if (isArray(props)) {
+    return [attrsGetter, ...props]
+  }
+  return [attrsGetter, props]
+}
+
+export function fallThroughAttrs(instance: ComponentInternalInstance) {
+  const {
+    block,
+    component: { inheritAttrs },
+  } = instance
+  if (inheritAttrs === false) return
+
+  if (block instanceof Element) {
+    renderEffect(() => setDynamicProps(block, instance.attrs))
+  }
+}

packages/runtime-vapor/src/dom/element.ts

@@ -1,5 +1,6 @@
 import { isArray, toDisplayString } from '@vue/shared'
 import type { Block } from '../apiRender'
+import { componentKey } from '../component'
 
 /*! #__NO_SIDE_EFFECTS__ */
 export function normalizeBlock(block: Block): Node[] {
@@ -8,6 +9,8 @@ export function normalizeBlock(block: Block): Node[] {
     nodes.push(block)
   } else if (isArray(block)) {
     block.forEach(child => nodes.push(...normalizeBlock(child)))
+  } else if (componentKey in block) {
+    nodes.push(...normalizeBlock(block.block!))
   } else if (block) {
     nodes.push(...normalizeBlock(block.nodes))
     block.anchor && nodes.push(block.anchor)