jsx2html/index.html at main · maddouri/jsx2html · GitHub

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<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta
      name="description"
      content="A live playground for converting JSX or TSX code to JS using Babel then to HTML using React"
    />
    <title>JSX to JS to HTML</title>

    <!-- Defer favicon https://stackoverflow.com/a/13416784/865719 -->
    <link id="favicon" rel="icon" href="data:image/svg+xml;base64,PHN2Zz48L3N2Zz4=" sizes="any" type="image/svg+xml" />

    <link href="https://cdn.jsdelivr.net/npm/modern-normalize@3.0.1/modern-normalize.min.css" rel="stylesheet" />
    <style>
      :root {
        --bg: #f8f8f8;
        --fg: #000000;
        --border: #e5e5e5;
      }

      html[data-theme="dark"] {
        --bg: #181818;
        --fg: #e0e0e0;
        --border: #2b2b2b;
      }

      body {
        background: var(--bg);
        color: var(--fg);
      }

      body,
      html {
        height: 100%;
      }

      body {
        display: flex;
        flex-direction: column;
        padding: 0.75rem 1rem 1rem 1rem;
      }

      .container {
        height: 100%;
        width: 100%;

        flex: 1;
        display: flex;
        gap: 1rem;

        /* Flexbox shrink fix:
         * Flex items default to min-height: auto, which prevents shrinking
         * below their content's minimum size. Monaco's internal DOM has a
         * ~100px min-content height, so without this, the editors won't shrink
         * immediately when the window height decreases.
         */
        min-height: 0;
      }

      .editor-panel {
        flex: 1;
        display: flex;
        flex-direction: column;
        min-height: 0;
        min-width: 0;
      }

      .editor-label {
        font-size: 0.72rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.06em;
        padding-bottom: 0.3rem;
        opacity: 0.55;
        user-select: none;
        white-space: nowrap;
      }

      .editor-label-sub {
        font-weight: 400;
        text-transform: none;
        letter-spacing: 0;
        opacity: 0.85;
      }

      .code-editor {
        flex: 1;
        border: 1px solid var(--border);

        /* Allow editors to shrink fully inside a flex container */
        min-height: 0;
        min-width: 0;
      }

      #page-title {
        font-size: 1rem;
        font-weight: 600;
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin: -0.25rem 0 0.25rem 0;
      }

      .header-actions {
        display: flex;
        align-items: center;
        /* gap: 0.25rem; */
      }

      #theme-toggle,
      #github-link {
        padding: 0.35rem 0.75rem;
        font-size: 0.9em;

        border: none;
        background: none;
        color: var(--fg); /* theme-aware icon color */

        cursor: pointer;
        /* border-radius: 6px; */

        /* subtle presence */
        opacity: 0.7;
        transition:
          opacity 0.2s ease,
          transform 0.1s ease;
      }

      #theme-toggle:hover,
      #github-link:hover {
        opacity: 1; /* gentle highlight */
      }
    </style>

    <!-- Needed for monaco-editor https://stackoverflow.com/a/76553340/865719 -->
    <!-- <link href="https://cdn.jsdelivr.net/npm/vscode-codicons@0.0.17/dist/codicon.min.css" rel="stylesheet"> -->
    <link href="https://cdn.jsdelivr.net/npm/@vscode/codicons@0.0.44/dist/codicon.min.css" rel="stylesheet" />
    <style>
      /* (re)Fetch the "codicon" font from the CDN because codicon.css tries to fetch it from "./codicon.ttf"
       * which fails because we don't serve it (nor do we want to serve it).
       * The following is a copy/paste of the relevant part of "codicon.css" but with the CDN URL instead of "./"
       */
      @font-face {
        font-family: "codicon";
        src: url("https://cdn.jsdelivr.net/npm/@vscode/codicons@0.0.44/dist/codicon.ttf?c7330ef9199d97dc5b8aae3449a5dc27")
          format("truetype");
        font-display: block;
      }
    </style>

    <script src="https://cdn.jsdelivr.net/npm/@babel/standalone@7.29.1/babel.min.js"></script>

    <script src="https://cdn.jsdelivr.net/npm/prettier@3.8.1/standalone.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/prettier@3.8.1/plugins/html.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/prettier@3.8.1/plugins/babel.min.js"></script>
    <!-- estree seems to be needed by prettier/plugins/babel  -->
    <script src="https://cdn.jsdelivr.net/npm/prettier@3.8.1/plugins/estree.min.js"></script>
  </head>

  <body>
    <h1 id="page-title">
      JSX to JS to HTML Converter
      <div class="header-actions">
        <a
          id="github-link"
          href="https://github.com/maddouri/jsx2html"
          target="_blank"
          rel="noopener noreferrer"
          aria-label="View source on GitHub"
        ></a>
        <button id="theme-toggle" aria-label="Toggle theme">Toggle Theme</button>
      </div>
    </h1>

    <div class="container">
      <div class="editor-panel">
        <div class="editor-label">1. JSX / TSX <span class="editor-label-sub">— you write this</span></div>
        <div class="code-editor" id="code-editor-input"></div>
      </div>
      <div class="editor-panel">
        <div class="editor-label">2. Compiled JS <span class="editor-label-sub">— Babel outputs this</span></div>
        <div class="code-editor" id="code-editor-output-js"></div>
      </div>
      <div class="editor-panel">
        <div class="editor-label">
          3. Rendered HTML <span class="editor-label-sub">— the browser renders this</span>
        </div>
        <div class="code-editor" id="code-editor-output-html"></div>
      </div>
    </div>

    <script type="module">
      // Set up favicon ////////////////////////////////////////////////////////////////////////////

      const faviconSvg = await loadIcon("https://cdn.jsdelivr.net/npm/lucide-static@0.575.0/icons/code-xml.svg");

      // https://stackoverflow.com/a/75608527/865719
      function setupFavicon(color) {
        const iconlink = document.querySelector("link#favicon");
        var iconcolor = "blue";
        const serialized = faviconSvg.replace("currentColor", color);

        const dataurl = "data:image/svg+xml;base64," + btoa(serialized);
        iconlink.setAttribute("href", dataurl);
      }
      // The favicon will be properly set in the theme handling logic

      // Set up the editors ////////////////////////////////////////////////////////////////////////
      // https://stackoverflow.com/a/76553340/865719
      // https://stackoverflow.com/a/79568880/865719
      import * as monaco from "https://cdn.jsdelivr.net/npm/monaco-editor@0.55.1/+esm";

      // Editor creation options
      // https://microsoft.github.io/monaco-editor/docs.html#functions/editor_editor_api.editor.create.html
      // https://microsoft.github.io/monaco-editor/docs.html#interfaces/editor_editor_api.editor.IStandaloneEditorConstructionOptions.html
      const editorDefaultOptions = {
        value: "",
        automaticLayout: true,
        stickyScroll: { enabled: false },
        tabSize: 2,
        insertSpaces: true,
      };

      const monacoInputEditor = await monaco.editor.create(document.getElementById("code-editor-input"), {
        // Using JS syntax until JSX support is added upstream https://github.com/microsoft/monaco-editor/issues/264
        language: "typescript",
        readOnly: false,
        ...editorDefaultOptions,
      });

      const monacoOutputEditorJs = await monaco.editor.create(document.getElementById("code-editor-output-js"), {
        language: "javascript",
        readOnly: true,
        ...editorDefaultOptions,
      });

      const monacoOutputEditorHtml = await monaco.editor.create(document.getElementById("code-editor-output-html"), {
        language: "html",
        readOnly: true,
        ...editorDefaultOptions,
      });

      // Misc //////////////////////////////////////////////////////////////////////////////////////

      async function loadIcon(url) {
        const res = await fetch(url);
        return await res.text(); // returns raw <svg>...</svg>
      }

      document.getElementById("github-link").innerHTML = await loadIcon(
        "https://cdn.jsdelivr.net/npm/lucide-static@0.575.0/icons/github.svg",
      );

      // Set up the theme switching logic //////////////////////////////////////////////////////////

      async function setupThemeToggle() {
        const sunIconSvg = await loadIcon("https://cdn.jsdelivr.net/npm/lucide-static@0.575.0/icons/sun.svg");
        const moonIconSvg = await loadIcon("https://cdn.jsdelivr.net/npm/lucide-static@0.575.0/icons/moon.svg");

        const toggleBtn = document.getElementById("theme-toggle");

        function setTheme(mode) {
          document.documentElement.setAttribute("data-theme", mode);
          monaco.editor.setTheme(mode === "dark" ? "vs-dark" : "vs");
          toggleBtn.innerHTML = mode === "dark" ? sunIconSvg : moonIconSvg;

          // Generate a random favicon color while we wait for an official non-hacky way of getting colors from monaco's theme
          // https://github.com/microsoft/monaco-editor/issues/4031#issuecomment-1596150839
          // https://css-tricks.com/snippets/javascript/random-hex-color/
          const faviconColor = Math.floor(Math.random() * 16777215).toString(16);
          console.log(`New favicon color: #${faviconColor}`);
          setupFavicon(`#${faviconColor}`);

          console.log(`Theme changed to ${mode}`);
        }

        let currentTheme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";

        setTheme(currentTheme);

        toggleBtn.addEventListener("click", () => {
          currentTheme = currentTheme === "light" ? "dark" : "light";
          setTheme(currentTheme);
        });
      }
      await setupThemeToggle();

      // Set up the rendering sandbox //////////////////////////////////////////////////////////////

      const appOrigin = window.location.origin;

      let renderingSandboxIFrame = null;

      function setupRenderingSandbox() {
        const iframeHtml = `<!doctype html>
<html lang="en">
<body>
    <div id="root"></div>

    <script crossorigin src="https://cdn.jsdelivr.net/npm/react@18/umd/react.production.min.js"><\/script>
    <script crossorigin src="https://cdn.jsdelivr.net/npm/react-dom@18/umd/react-dom.production.min.js"><\/script>

    <script>
      console.log("Rendering sandbox loading...");

      const root = ReactDOM.createRoot(document.getElementById('root'));

      window.addEventListener('message', (event) => {
        try {
          const fn = new Function("React", event.data.code);
          const element = fn(React);

          ReactDOM.flushSync(() => {
            root.render(element);
          });

          parent.postMessage(
            { html: document.getElementById('root').innerHTML },
            '${appOrigin}'
          );
        } catch (e) {
          parent.postMessage({ error: e.message }, '${appOrigin}');
        }
      });
    <\/script>
</body>
</html>
`;
        // https://stackoverflow.com/a/44211814/865719
        const blob = new Blob([iframeHtml], { type: "text/html" });
        const url = URL.createObjectURL(blob);
        const i = document.createElement("iframe");
        i.src = url;
        i.sandbox = "allow-scripts";
        i.id = "rendering-sandbox";
        i.style = "display:none;";
        document.body.appendChild(i);

        i.addEventListener("load", () => {
          URL.revokeObjectURL(url);
          renderingSandboxIFrame = i;
          console.log("Rendering sandbox loaded");
        });

        console.log("Rendering sandbox configured", url);
      }
      setupRenderingSandbox();

      // Set up the conversion system //////////////////////////////////////////////////////////////

      // Wait for all libraries to load
      function checkReady() {
        if (Babel && renderingSandboxIFrame) {
          console.log("All libraries loaded");
          setupConverter();
        } else {
          setTimeout(checkReady, 10);
        }
      }

      async function asyncWriteToEditor(monacoEditor, prettierParser, content) {
        // https://prettier.io/docs/api
        if (prettierParser) {
          const prettyContent = await prettier.format(content, {
            parser: prettierParser,
            plugins: prettierPlugins,
            htmlWhitespaceSensitivity: "ignore",
          });
          monacoEditor.setValue(prettyContent);
        } else {
          monacoEditor.setValue(content);
        }
      }

      async function convertInputEditorContent() {
        console.log("New conversion");
        try {
          const inputEditorContent = monacoInputEditor.getValue();

          // const transformedToAutomaticRuntime = Babel.transform(inputEditorContent, {
          //     // presets: ['react']
          //     // presets: [ ["react", { runtime: "classic" }] ]
          //     presets: [ ["react", { runtime: "automatic" }], ["typescript", { allExtensions: true, isTSX: true }] ]
          // }).code;
          // await asyncWriteToEditor(monacoOutputEditorJs, "babel", transformedToAutomaticRuntime);

          const transformedToClassicRuntime = Babel.transform(inputEditorContent, {
            presets: [
              ["react", { runtime: "classic" }],
              ["typescript", { allExtensions: true, isTSX: true }],
            ],
          }).code;
          await asyncWriteToEditor(monacoOutputEditorJs, "babel", transformedToClassicRuntime);

          function wrapTransformedCode(code) {
            const ast = Babel.packages.parser.parse(code, {
              sourceType: "module",
              // plugins: ["javascript"]
            });

            const t = Babel.packages.types;
            const body = ast.program.body;

            if (body.length < 1) {
              body.push(
                t.returnStatement(t.stringLiteral('Nothing to render. Did you write an "expression" to render?')),
              );
            }

            const last = body[body.length - 1];

            if (t.isExpressionStatement(last)) {
              // Replace last statement with a return
              body[body.length - 1] = t.returnStatement(last.expression);
            } else {
              body.push(
                t.returnStatement(t.stringLiteral('Nothing to render. Did you write an "expression" to render?')),
              );
            }

            // We could wrap everything in a function
            // const func = t.functionExpression(
            //     t.identifier("renderMe"),
            //     [],
            //     t.blockStatement(body)
            // );
            //
            // const call = t.callExpression(func, []);
            //
            // return Babel.packages.generator.generate(call).code;

            // For now, simply return the code block.
            // It will be wrapped in a "new Function()" by the rendering sandbox
            return Babel.packages.generator.generate(t.blockStatement(body)).code;
          }

          const transformedToClassicRuntimeWithReturn = wrapTransformedCode(transformedToClassicRuntime);

          // Using appOrigin as the target origin doesn't seem to work.
          // Perhaps due to the iframe's use of sandbox="allow-scripts" without "allow-same-origin" ? I'm not sure.
          renderingSandboxIFrame.contentWindow.postMessage({ code: transformedToClassicRuntimeWithReturn }, "*");
        } catch (e) {
          monacoOutputEditorJs.setValue("Error: " + e.message);
          monacoOutputEditorHtml.setValue("Error: " + e.message);
        }
      }

      function setupConverter() {
        window.addEventListener("message", async (event) => {
          // The iframe uses sandbox="allow-scripts" without "allow-same-origin".
          // Therefore:
          // * It has an opaque origin and event.origin will be "null"
          // * For now, we'll check event.source only

          // Ignore unrelated messages
          if (event.source !== renderingSandboxIFrame.contentWindow) {
            return;
          }

          console.log("Received html result:", event);
          console.log("event.data:", event.data);

          if (event.data.error) {
            monacoOutputEditorHtml.setValue("Error: " + event.data.error);
          } else if (event.data.html !== undefined) {
            await asyncWriteToEditor(monacoOutputEditorHtml, "html", event.data.html);
          }
        });

        monacoInputEditor.onDidChangeModelContent(convertInputEditorContent);

        // Some sample JSX
        monacoInputEditor.setValue(
          `const Foo = () => {
  return <button>Click me from Foo</button>;
}

type BarProps = {
  name: string;
};

function Bar({name}: BarProps) {
  return (
    <div>
      <label>Hello {name} from Bar</label>
      <Foo/>
    </div>
  );
}

// Add a JSX expression to render as HTML, e.g.:
<>
  <h1>This is some JSX to render as HTML</h1>
  <Bar name={"My Name"}/>
  <p>Footer</p>
</>
`,
        );
      }

      checkReady();
    </script>
  </body>
</html>