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https://github.com/vuejs/babel-plugin-transform-vue-jsx
babel plugin for vue 2.0 jsx
https://github.com/vuejs/babel-plugin-transform-vue-jsx
Last synced: 3 days ago
JSON representation
babel plugin for vue 2.0 jsx
- Host: GitHub
- URL: https://github.com/vuejs/babel-plugin-transform-vue-jsx
- Owner: vuejs
- Created: 2016-06-17T22:47:17.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2022-12-06T19:46:31.000Z (about 2 years ago)
- Last Synced: 2024-10-29T15:25:58.277Z (about 2 months ago)
- Language: JavaScript
- Size: 665 KB
- Stars: 1,849
- Watchers: 43
- Forks: 132
- Open Issues: 54
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
- awesome-vue-js - Babel Plugin-transform-vue-jsx
README
# babel-plugin-transform-vue-jsx [](https://circleci.com/gh/vuejs/babel-plugin-transform-vue-jsx)
> Babel plugin for Vue 2.0 JSX
### Babel Compatibility Notes
- If using Babel 7, use 4.x
- If using Babel 6, use 3.x
### Requirements
- 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`.
### Usage
``` bash
npm install\
babel-plugin-syntax-jsx\
babel-plugin-transform-vue-jsx\
babel-helper-vue-jsx-merge-props\
babel-preset-env\
--save-dev
```
In your `.babelrc`:
``` json
{
"presets": ["env"],
"plugins": ["transform-vue-jsx"]
}
```
The plugin transpiles the following JSX:
``` jsx
{this.text}
```
To the following JavaScript:
``` js
h('div', {
attrs: {
id: 'foo'
}
}, [this.text])
```
Note the `h` function, which is a shorthand for a Vue instance's `$createElement` method, must be in the scope where the JSX is. Since this method is passed to component render functions as the first argument, in most cases you'd do this:
``` js
Vue.component('jsx-example', {
render (h) { // <-- h must be in scope
return
bar
}
})
```
### `h` auto-injection
Starting with version 3.4.0 we automatically inject `const h = this.$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.
``` js
Vue.component('jsx-example', {
render () { // h will be injected
return
bar
},
myMethod: function () { // h will not be injected
return bar
},
someOtherMethod: () => { // h will not be injected
return bar
}
})
@Component
class App extends Vue {
get computed () { // h will be injected
return
bar
}
}
```
### 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:
``` js
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:
``` jsx
render (h) {
return (
)
}
```
### 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:
``` js
import Todo from './Todo.js'
export default {
render (h) {
return // 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:
``` jsx
const data = {
class: ['b', 'c']
}
const vnode =
```
The merged data will be:
``` js
{ class: ['a', 'b', 'c'] }
```
### Vue directives
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:
1. Pass everything as an object via `value`, e.g. `v-name={{ value, modifier: true }}`
2. Use the raw vnode directive data format:
``` js
const directives = [
{ name: 'my-dir', value: 123, modifiers: { abc: true } }
]
return
```