Babel plugin for Vue 2.0 JSX
- If using Babel 7, use 4.x
- If using Babel 6, use 3.x
-
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\
babel-plugin-syntax-jsx\
babel-plugin-transform-vue-jsx\
babel-helper-vue-jsx-merge-props\
babel-preset-env\
--save-devIn your .babelrc:
{
"presets": ["env"],
"plugins": ["transform-vue-jsx"]
}The plugin transpiles the following JSX:
<div id="foo">{this.text}</div>To the following JavaScript:
h('div', {
attrs: {
id: 'foo'
}
}, [this.text])Note the h function, which is a shorthand for a Vue instance's $createElement method, must be in the scope where the JSX is. Since this method is passed to component render functions as the first argument, in most cases you'd do this:
Vue.component('jsx-example', {
render (h) { // <-- h must be in scope
return <div id="foo">bar</div>
}
})Starting with version 3.4.0 we automatically inject const h = this.$createElement in any method and getter (not functions or arrow functions) declared in ES2015 syntax that has JSX so you can drop the (h) parameter.
Vue.component('jsx-example', {
render () { // h will be injected
return <div id="foo">bar</div>
},
myMethod: function () { // h will not be injected
return <div id="foo">bar</div>
},
someOtherMethod: () => { // h will not be injected
return <div id="foo">bar</div>
}
})
@Component
class App extends Vue {
get computed () { // h will be injected
return <div id="foo">bar</div>
}
}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',
onCustomEvent: this.customEventHandler
},
// 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 (
<div
// normal attributes or prefix with on props.
id="foo"
propsOnCustomEvent={this.customEventHandler}
// DOM properties are prefixed with `domProps`
domPropsInnerHTML="bar"
// event listeners are prefixed with `on` or `nativeOn`
onClick={this.clickHandler}
nativeOnClick={this.nativeClickHandler}
// other special top-level properties
class={{ foo: true, bar: false }}
style={{ color: 'red', fontSize: '14px' }}
key="key"
ref="ref"
// assign the `ref` is used on elements/components with v-for
refInFor
slot="slot">
</div>
)
}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 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'] }Note that almost all built-in Vue directives are not supported when using JSX, the sole exception being v-show, which can be used with the v-show={value} syntax. In most cases there are obvious programmatic equivalents, for example v-if is just a ternary expression, and v-for is just an array.map() expression, etc.
For custom directives, you can use the v-name={value} syntax. However, note that directive arguments and modifiers are not supported using this syntax. There are two workarounds:
-
Pass everything as an object via
value, e.g.v-name={{ value, modifier: true }} -
Use the raw vnode directive data format:
const directives = [
{ name: 'my-dir', value: 123, modifiers: { abc: true } }
]
return <div {...{ directives }}/>
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