smineddf/babel-plugin-jsx-html

Render JSX into html string

• babel-plugin-jsx-html
  • Motivation
  • What to use it for
• Usage
  • Install
  • Add plugin
  • [optional] TypeScript
  • Create templates with JSX
    • Example
• Contribution
  • Prerequisites
  • Testing & linting

babel-plugin-jsx-html

This plugin turns JSX into HTML template functions that return plain HTML string when combined.

Motivation

I wanted to create HTML template functions using familiar JSX syntax instead of JS's native templating (${}) because it is too verbose at large scale and does not look like HTML.

What to use it for

The idea is to use it on server-side to render plain HTML without any view-level frameworks.

Usage

Install

Note that this library has runtime dependency, so don't make it devDependency.

npm install babel-plugin-jsx-html

or

yarn add babel-plugin-jsx-html

Add plugin

In your babel.config.json (or any other way of configuring babel):

note the omitted babel-plugin prefix

{
    "plugins": ["jsx-html"]
}

[optional] TypeScript

If you are using TypeScript (.tsx), you will also need to extend your tsconfig from the config at babel-plugin-jsx-html/tsconfig:

{
    "extends": "babel-plugin-jsx-html/tsconfig"
}

This instructs TS to not assume that JSX syntax means "we are using react" and not preprocess it for React.

If you can't extend tsconfig for some reason, you can directly include needed config parts:

{
    "compilerOptions": {
        "jsx": "preserve"
    },
    "include": ["babel-plugin-jsx-html/types.d.ts"]
}

Create templates with JSX

Generally, it's similar to what you would do with React. However, there are differences, of cource, since at the end it's just HTML without JavaScript.

Differences from React JSX

There are differences from React that you need to keep in mind:

• there are no hooks, no class components, no context, etc., templates are just pure functions that return jsx elements
• array of children is passed as the second argument to template functions instead of chilren prop const A = (props, children) => <div>{...children}</div> instead of const B = (props) => <div>{props.children}</div>
• to be correctly rendered (without , symbols, which are an artifact of default array conversion to string), children need to be spred: {...children}
• React has its own names for some html element properties (className), also the styles can be written as an object (style={{ width: 50 }}), It's not possible to do it here, use plain HTML-way when creating props
• event handler functions are not supported as props, if you want to use an inline handler, you will need to stringify them like you would do in HTML (<button onclick="alert(1);" />)

Example

const Foo = ({ style }, children) => {
    return (
        <div style={style}>
            Green text before children
            {...children}
        </div>
    );
}

const Bar = ({ src }) => {
    return (
        <div style="background:red;">
            <img src={src} style="opacity:0.7;" />
        </div>
    );
}

const Baz = () => {
    return (
        <Foo style="color:green;">
            <div>
                Something before Bar
            </div>
            <Bar src="/some-image.png" />
        </Foo>
    );
}

Transpiled code:

const Foo = ({ style }, children) => {
    return _babel_plugin_jsx_html_runtime.createNativeElement("div", {
        style: style
    }, ["Green text before children", ...children]);
};

const Bar = ({ src }) => {
    return _babel_plugin_jsx_html_runtime.createNativeElement("div", {
        style: "background:red;"
    }, [_babel_plugin_jsx_html_runtime.createNativeElement("img", {
        src: src,
        style: "opacity:0.7;"
    }, [])]);
};

const Baz = () => {
    return Foo({
        style: "color:green;"
    }, [_babel_plugin_jsx_html_runtime.createNativeElement("div", {}, ["Something before Bar"]), Bar({
        src: "/some-image.png"
    }, [])]);
};

Running transpiled Baz will return you this (as string):

<!-- 
    Actual outcome will not have line breaks and indentation,
    it will just be a one-line string,
    see ./tests/test-readme-example/expected.html
-->
<div style="color:green;">
    Green text before children
    <div>Something before Bar</div>
    <div style="background:red;">
        <img src="/some-image.png" style="opacity:0.7;"></img>
    </div>
</div>

Contribution

Prerequisites

1. Clone the repository
2. cd babel-plugin-jsx-html
3. npm install
4. npm run build

Testing & linting

Don't forget to test changes before pushing them:

1. npm run build to rebuild the lib
2. npm run test
3. npm run lint