vue-jsx-runtime

Vue 3 jsx runtime support.

The background https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html . With new jsx runtime support, which means a JSX ast standard, every lib can have its own jsx syntax with small limits.

Examples with TS:

• vite with esbuild usage
• vue-cli with babel usage
• swc

TODO:

• optimize, transformOn, isCustomElement ...
• dev validation
• more tests
• more features

Installation

Install the plugin with:

pnpm add vue-jsx-runtime
# or
npm install vue-jsx-runtime

Usage

In Babel

// babel plugin
plugins: [
  [
    // add @babel/plugin-transform-react-jsx
    '@babel/plugin-transform-react-jsx',
    {
      throwIfNamespace: false,
      runtime: 'automatic', 
      importSource: 'vue-jsx-runtime'
    }
  ],
],

In TypeScript

tsconfig.json:

{
  "compilerOptions": {
    "jsx": "react-jsxdev", /* 'react-jsx' or 'react-jsxdev'. You can also use 'preserve' to use babel or other tools to handle jsx*/
    "jsxImportSource": "vue-jsx-runtime"
  }
}

If you used with Babel, you need to set the config:

{
  "compilerOptions": {
    "jsx": "preserve", /* 'react-jsx' or 'react-jsxdev'. You can also use 'preserve' to use babel or other tools to handle jsx*/
  }
}

In Other Tools

If you use some tool which support jsx-runtime, like swc, you can use like this:

.swcrc:

{
  "jsc": {
    "transform": {
      "react": {
        "runtime": "automatic",
        "importSource": "vue-jsx-runtime"
      }
    }
  }
}

More details, see https://swc.rs/docs/configuration/compilation#jsctransformreact

About esbuild, see https://github.com/evanw/esbuild/issues/1172 and a hack way https://github.com/evanw/esbuild/issues/832 . https://github.com/evanw/esbuild/issues/334#issuecomment-711444731 .

Syntax

Content

Functional component:

const App = () => <div>Vue 3.0</div>;

with render

const App = {
  render() {
    return <div>Vue 3.0</div>;
  },
}

import { withModifiers, defineComponent } from "vue";

const App = defineComponent({
  setup() {
    const count = ref(0);

    const inc = () => {
      count.value++;
    };

    return () => (
      <div onClick={withModifiers(inc, ["self"])}>{count.value}</div>
    );
  },
});

Fragment

const App = () => (
  <>
    <span>I'm</span>
    <span>Fragment</span>
  </>
);

Attributes / Props

const App = () => <input type="email" />;

with a dynamic binding:

const placeholderText = "email";
const App = () => <input type="email" placeholder={placeholderText} />;

Directives

v-show

const App = {
  data() {
    return { visible: true };
  },
  render() {
    return <input v-show={this.visible} />;
  },
};

v-model

A little different with @vue/babel-plugin-jsx.

Syntax:

v-model={[object, ["path/key"], argument, ["modifier"]]}

Recommend:

const val = ref(1); // val.value will be 1
// jsx
<input v-model={val} /> // do not use v-model={val.value}

<input v-model:argument={val} />

v-model will use val["value"] to getter or setter by default.

Other usage

const val = ref(1);

<input v-model={[val, "value", ["modifier"]]} />

<A v-model={[val, "value", "argument", ["modifier"]]} />

Will compile to:

h(A, {
  argument: val["value"],
  argumentModifiers: {
    modifier: true,
  },
  "onUpdate:argument": ($event) => (val["value"] = $event),
});

custom directive

Recommended when using string arguments

const App = {
  directives: { custom: customDirective },
  setup() {
    return () => <a v-custom:arg={val} />;
  },
};

const App = {
  directives: { custom: customDirective },
  setup() {
    return () => <a v-custom={[val, ["value"], "arg", ["a", "b"]]} />;
  },
};

Slot

Recommend

Use object slots:

const A = (props, { slots }) => (
  <>
    <h1>{ slots.default ? slots.default() : 'foo' }</h1>
    <h2>{ slots.bar?.() }</h2>
  </>
);

const App = {
  setup() {
    return () => (
      <>
        <A>
          {{
            default: () => <div>A</div>,
            bar: () => <span>B</span>,
          }}
        </A>
        <B>{() => "foo"}</B>
      </>
    );
  },
};

Use v-slots

Note: In jsx, v-slot should be replace with v-slots

const App = {
  setup() {
    const slots = {
      bar: () => <span>B</span>,
    };
    return () => (
      <A v-slots={slots}>
        <div>A</div>
      </A>
    );
  },
};
// or
const App = {
  setup() {
    const slots = {
      default: () => <div>A</div>,
      bar: () => <span>B</span>,
    };
    return () => <A v-slots={slots} />;
  },
};

Different with vue jsx-next

• jsx-next is a plugin for Babel only.
• vue-jsx-runtime can be used with Babel, TypeScript, swc, esbuild and more.

vue-jsx-runtime limits:

• can not merge ele/component props
• v-model syntax is little different with jsx-next - v-model

GitHub

https://github.com/dolymood/vue-jsx-runtime