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fix(jsx-runtime): fix automatic runtime implementation #7959

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merged 3 commits into from
Mar 28, 2023
Merged

fix(jsx-runtime): fix automatic runtime implementation #7959

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c8bdfe6
fix(jsx-runtime): fix automatic runtime implementation
remcohaszing Mar 26, 2023
815648b
Update index.js
yyx990803 Mar 28, 2023
9577f1c
Update index.mjs
yyx990803 Mar 28, 2023
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19 changes: 17 additions & 2 deletions packages/vue/jsx-runtime/index.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,19 @@
const Vue = require('vue')
exports.jsx = Vue.h
exports.jsxDEV = Vue.h

function jsx(type, { children, ...props }) {
return Vue.h(type, props, children)
}

function jsxs(type, { children, ...props }) {
return Vue.h(type, props, ...children)
}

function jsxDEV(type, props, key, isStatic) {
const fn = isStatic ? jsxs : jsx
return fn(type, props)
}

exports.jsx = jsx
exports.jsxs = jsxs
exports.jsxDEV = jsxDEV
exports.Fragment = Vue.Fragment
17 changes: 16 additions & 1 deletion packages/vue/jsx-runtime/index.mjs
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Upon closer inspection it looks like h accepts children as either a child, multiple children, or rest arguments. So this file could probably be simplified so something like this:

import { h, Fragment } from 'vue'

function jsx(type, { children, ...props }) {
  return h(type, props, children)
}

export {
  Fragment,
  jsx,
  jsx as jsxs,
  jsx as jsxDEV
}

Since props are always a newly created object when passed to jsx, the following small performance enhancement could even be made to avoid another shallow copy of props:

function jsx(type, props) {
  const { children } = props
  delete props.children
  return h(type, props, children)
}

Still, would prefer you to see the original changes to get a better understanding of the JSX automatic runtime.

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This makes sense, the optimization also makes sense.

FYI Vue does recommend using its own JSX babel plugin which compiles JSX differently, these functions are meant for compatibility when the user opts for React-style JSX transforms.

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Great to see this land! Regarding “these functions are meant for compatibility when the user opts for React-style JSX transforms”, it’s good to be aware that there are differences in how React-style JSX is normally written, and what props are accepted in Vue.

Notably className vs class. But it gets quite complex around SVG (different camelcased and dash-cases attributes and tag names, xlink:href) and style (are objects accepted? Vendors prefixes with dashes or camelcase? CSS variables?).

So might be good to have some docs on how to author JSX with this, and tests that show weird SVG things work!

Original file line number Diff line number Diff line change
@@ -1 +1,16 @@
export { h as jsx, h as jsxDEV, Fragment } from 'vue'
import { h, Fragment } from 'vue'

export { Fragment }

export function jsx(type, { children, ...props }) {
return h(type, props, children)
}

export function jsxs(type, { children, ...props }) {
return h(type, props, ...children)
}

export function jsxDEV(type, props, key, isStatic) {
const fn = isStatic ? jsxs : jsx
return fn(type, props)
}
5 changes: 5 additions & 0 deletions packages/vue/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,11 @@
"import": "./jsx-runtime/index.mjs",
"require": "./jsx-runtime/index.js"
},
"./jsx-dev-runtime": {
"types": "./jsx-runtime/index.d.ts",
"import": "./jsx-runtime/index.mjs",
"require": "./jsx-runtime/index.js"
},
"./jsx": {
"types": "./jsx.d.ts"
},
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