vue-next-jsx

Vue Next JSX Explorer

A babel plugin that provides jsx syntax for vue3

• Supports both jsx and tsx
• Same behavior as Vue3 Compiler
• Fully supports v-on / v-model
• Support optimizate mode: analyze PatchFlags
• Write in Typescript
• Other directives: v-html / v-text
• Try to minimize the volume of generated code

Usage

Installation

npm install @hcysunyang/babel-plugin-vue-next-jsx -D
# or
yarn add @hcysunyang/babel-plugin-vue-next-jsx -D

Babel Config

{
  "presets": [
    "@babel/env"
  ],
  "plugins": [
    "@hcysunyang/vue-next-jsx"
  ]
}

For typescript users

Please read this thread: https://github.com/vuejs/jsx/issues/141

For the sake of type hinting and type safety, we recommend using the following syntax:

vModel

Intrinsic Elements

<!-- value -->
<input vModel={ [refVal.value] } />
<!-- value + array modifiers -->
<input vModel={ [refVal.value, ['number', 'trim']] } />
<!-- value + object modifiers -->
<input vModel={ [refVal.value, { number: true }] } />
<!-- modifiers as a variable -->
<input vModel={ [refVal.value, modifiers] } />

Components

<!-- value -->
<Comp vModel={ [refVal.value] } />
<!-- value + array modifiers -->
<Comp vModel={ [refVal.value, 'modelValue', ['a', 'b']] } />
<!-- value + object modifiers -->
<Comp vModel={ [refVal.value, 'modelValue', { a: true, b: true }] } />
<!-- value + propName -->
<Comp vModel={ [refVal.value, 'foo'] } />
<!-- value + dynamic propName -->
<Comp vModel={ [refVal.value, refName.value] } />
<!-- value + dynamic propName + modifiers -->
<Comp vModel={ [refVal.value, refName.value, ['a', 'b']] } />
<!-- modifiers as a variable -->
<Comp vModel={ [refVal.value, refName.value, modifiers] } />

<div onClick={ handler }></div>
<div onClick={ withModifiers(handler, ['self']) }></div>

For type hints, you can check our dts test:

• intrinaicElements.test-d.tsx.
• components.test-d.tsx.

tsconfig.json

{
  // ...
  "compilerOptions": {
    "types": ["@hcysunyang/babel-plugin-vue-next-jsx"],
  }
  // ...
}

For javascript users

Event: v-on-eventname_modifier

We often do this in template:

<p v-on:click.stop="handler"></p>

In (j|t)sx:

<p v-on-click_stop="handler"></p>

tsx does not allow to use : and . as attribute name

If it is available in the template, it is available in j/tsx too， here are some examples:

<div v-on-click_middle={ handler }></div>
<div v-on-click_stop={ handler }></div>
<div v-on-click_right={ handler }></div>
<div v-on-keyup_esc={ handler }></div>

<div v-on={ obj }></div>

v-model-propname_modifier

<input v-model={ refVal.value }/>
<input v-model={ refVal.value } :type={ refType.value }/>
<select v-model={ refVal.value }/>
<textarea v-model={ refVal.value }/>

v-model in the component:

<Comp v-model-foo_a={ refVal.value }/>

The generated code is:

createVNode(Comp, {
  "foo": ref.val,
  "onUpdate:foo": $event => ref.val = $event,
  "fooModifiers": {
    "a": true,
    "b": true
  }
})

This is consistent with Vue3 Compiler behavior.

v-bind

In fact, we don't need v-bind in (j|t)sx, we can use jsxExpressionContainer and jsxSpreadAttribute directly:

<Comp foo={ refVal.value } { ...props } bar="bar" />

The generated code is:

const el = createVNode(Comp,
  mergeProps(
    { foo: refVal.value },
    { ...props },
    { bar: "bar" }
  )
)

slots

I don’t want to support v-slot. One of the most important reasons is that in tsx: the type of scopedSlot is lost. It is recommended to do this(and this is the only way):

const App = {
  setup() {

    return () => {

      const slots = {
        default: () => [ <p>default</p> ],
        foo: ({ val }) => [ <p>{ val }</p> ]
      }

      return <Comp>{ slots }</Comp>

    }
  }
}

KeepAlive And Teleport

In Vue3, the children of KeepAlive and Teleport components will not be built as slots, so you can use them as in the template:

Fragment

Since Vue3 supports multiple root elements, so we need to support Fragment:

<>
  <p>foo</p>
  <div>bar</div>
</>

Optimization mode

Vue3 makes full use of compile-time information to generate PatchFlags for runtime update performance improvement, vue-next-jsx behaves as Vue3 Compiler after enabling optimization mode.

In the babel.config.json file:

{
  "presets": [
    "@babel/env"
  ],
  "plugins": [
    ["@hcysunyang/vue-next-jsx", {
      // Enabling optimization mode
      "optimizate": true
    }]
  ]
}

Specify source

If you install vue instead of @vue/runtime-dom then you don’t need to do anything, but if you install @vue/runtime-dom, then you need to specify source:

{
  "presets": [
    "@babel/env"
  ],
  "plugins": [
    ["@hcysunyang/vue-next-jsx", {
      // Specify source
      "source": "@vue/runtime-dom"
    }]
  ]
}

v-html / v-text

Just like using them in template:

<p v-html={ refHtml.value }></p>
<p v-text={ refText.value }></p>

Other Directives

Supported:

• v-show

<p v-show={ refVal.value }></p>