1.2.1 • Published 1 year ago

@vue/babel-plugin-transform-vue-jsx v1.2.1

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1 year ago


Babel plugin for Vue 2.0 JSX

Babel Compatibility Notes


  • Assumes you are using Babel with a module bundler e.g. Webpack, because the spread merge helper is imported as a module to avoid duplication.

  • This is mutually exclusive with babel-plugin-transform-react-jsx.


npm install @vue/babel-plugin-transform-vue-jsx --save-dev
npm install @vue/babel-helper-vue-jsx-merge-props --save

In your .babelrc:

  "plugins": ["transform-vue-jsx"]

However it is recommended to use the configurable preset instead.


The plugin transpiles the following JSX:

<div id="foo">{this.text}</div>

To the following JavaScript:

    attrs: {
      id: 'foo',

Note the h function, which is a shorthand for a Vue instance's $createElement method, must be in the scope where the JSX is. Since this method is passed to component render functions as the first argument, in most cases you'd do this:

Vue.component('jsx-example', {
  render(h) {
    // <-- h must be in scope
    return <div id="foo">bar</div>

Difference from React JSX

First, Vue 2.0's vnode format is different from React's. The second argument to the createElement call is a "data object" that accepts nested objects. Each nested object will be then processed by corresponding modules:

render (h) {
  return h('div', {
    // Component props
    props: {
      msg: 'hi'
    // Normal HTML attributes
    attrs: {
      id: 'foo'
    // DOM props
    domProps: {
      innerHTML: 'bar'
    // Event handlers are nested under "on", though
    // modifiers such as in v-on:keyup.enter are not
    // supported. You'll have to manually check the
    // keyCode in the handler instead.
    on: {
      click: this.clickHandler
    // For components only. Allows you to listen to
    // native events, rather than events emitted from
    // the component using vm.$emit.
    nativeOn: {
      click: this.nativeClickHandler
    // Class is a special module, same API as `v-bind:class`
    class: {
      foo: true,
      bar: false
    // Style is also same as `v-bind:style`
    style: {
      color: 'red',
      fontSize: '14px'
    // Other special top-level properties
    key: 'key',
    ref: 'ref',
    // Assign the `ref` is used on elements/components with v-for
    refInFor: true,
    slot: 'slot'

The equivalent of the above in Vue 2.0 JSX is:

render (h) {
  return (
      // Component props
      // Normal attributes or component props.
      // DOM properties are prefixed with `domProps`
      // event listeners are prefixed with `on` or `nativeOn`
      // other special top-level properties
      class={{ foo: true, bar: false }}
      style={{ color: 'red', fontSize: '14px' }}
      // assign the `ref` is used on elements/components with v-for

Component Tip

If a custom element starts with lowercase, it will be treated as a string id and used to lookup a registered component. If it starts with uppercase, it will be treated as an identifier, which allows you to do:

import Todo from './Todo.js'

export default {
  render(h) {
    return <Todo /> // no need to register Todo via components option

JSX Spread

JSX spread is supported, and this plugin will intelligently merge nested data properties. For example:

const data = {
  class: ['b', 'c'],
const vnode = <div class="a" {...data} />

The merged data will be:

{ class: ['a', 'b', 'c'] }

Vue directives

Vue directives are usable the same way as in template with a few key differences:

  1. You can use directives camelCased instead of kebab-cased (vMyDirective is treated as v-my-directive)
  2. You have to use underscore sign instead of dots for modifiers because of JSXIdentifier limitation.
  3. Only runtime directives work (only v-show and custom directives), compile-time directives are out of this project's scope.

A full example would be: <MyComponent vMyDirective:argument_modifier1_modifier2={someExpression} />