JSPM

import React from "react";
import ReactDOM from "react-dom";
import MDEditor from '@uiw/react-md-editor';

export default function App() {
  const [value, setValue] = React.useState("**Hello world!!!**");
  return (
    <div className="container">
      <MDEditor
        value={value}
        onChange={setValue}
      />
      <MDEditor.Markdown source={value} />
    </div>
  );
}

import React from "react";
import ReactDOM from "react-dom";
import MDEditor from '@uiw/react-md-editor';

export default function App() {
  return (
    <div className="container">
      <MDEditor.Markdown source="Hello Markdown!" />
    </div>
  );
}

import React from "react";
import ReactDOM from "react-dom";
import MDEditor from '@uiw/react-md-editor';
import katex from 'katex';
import 'katex/dist/katex.css';

const mdKaTeX = `This is to display the 
\`\$\$\c = \\pm\\sqrt{a^2 + b^2}\$\$\`
 in one line

\`\`\`KaTeX
c = \\pm\\sqrt{a^2 + b^2}
\`\`\`
`;

export default function App() {
  return (
    <MDEditor
      value={mdKaTeX}
      previewOptions={{
        components: {
          code: ({ inline, children, className, ...props }) => {
            const txt = children[0] || '';
            if (inline) {
              if (typeof txt === 'string' && /^\$\$(.*)\$\$/.test(txt)) {
                const html = katex.renderToString(txt.replace(/^\$\$(.*)\$\$/, '$1'), {
                  throwOnError: false,
                });
                return <code dangerouslySetInnerHTML={{ __html: html }} />;
              }
              return <code>{txt}</code>;
            }
            if (
              typeof txt === 'string' &&
              typeof className === 'string' &&
              /^language-katex/.test(className.toLocaleLowerCase())
            ) {
              const html = katex.renderToString(txt, {
                throwOnError: false,
              });
              return <code dangerouslySetInnerHTML={{ __html: html }} />;
            }
            return <code className={String(className)}>{txt}</code>;
          },
        },
      }}
    />
  );
}

import React from "react";
import MDEditor, { commands, ICommand, TextState, TextAreaTextApi } from "@uiw/react-md-editor";
import domToImage from "dom-to-image";

const textToImage: ICommand = {
  name: "Text To Image",
  keyCommand: "text2image",
  buttonProps: { "aria-label": "Insert title3" },
  icon: (
    <svg width="12" height="12" viewBox="0 0 20 20">
      <path fill="currentColor" d="M15 9c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm4-7H1c-.55 0-1 .45-1 1v14c0 .55.45 1 1 1h18c.55 0 1-.45 1-1V3c0-.55-.45-1-1-1zm-1 13l-6-5-2 2-4-5-4 8V4h16v11z" ></path>
    </svg>
  ),
  execute: (state: TextState, api: TextAreaTextApi) => {
    const dom = document.getElementsByClassName("w-md-editor")[0];
    if (dom) {
      domToImage.toJpeg(dom, {}).then((dataUrl) => {
        const link = document.createElement("a");
        link.download = "image.jpg";
        link.href = dataUrl;
        link.click();
      });
    }
  }
};

export default function App() {
  return (
    <div className="container">
      <MDEditor
        value="**Hello world!!!**"
        commands={[
          textToImage,
          commands.divider
        ]}
      />
    </div>
  );
}

import React from "react";
import ReactDOM from "react-dom";
import MDEditor from "@uiw/react-md-editor";
import mermaid from "mermaid";

const mdMermaid = `The following are some examples of the diagrams, charts and graphs that can be made using Mermaid and the Markdown-inspired text specific to it. 

\`\`\`mermaid
graph TD
A[Hard] -->|Text| B(Round)
B --> C{Decision}
C -->|One| D[Result 1]
C -->|Two| E[Result 2]
\`\`\`

\`\`\`mermaid
sequenceDiagram
Alice->>John: Hello John, how are you?
loop Healthcheck
    John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!
\`\`\`
`;

export default function App() {
  return (
    <MDEditor
      height={500}
      value={mdMermaid || ""}
      previewOptions={{
        components: {
          code: ({ inline, children, className, ...props }) => {
            const txt = children[0] || '';
            if (
              typeof txt === 'string' &&
              typeof className === 'string' &&
              /^language-mermaid/.test(className.toLocaleLowerCase())
            ) {
              const Elm = document.createElement("div");
              Elm.id = "demo";
              const svg = mermaid.render("demo", txt);
              return <code dangerouslySetInnerHTML={{ __html: svg }} />
            }
            return <code className={String(className)}>{txt}</code>;
          },
        },
      }}
    />
  );
}

ReactDOM.render(<App />, document.getElementById("container"));

// pages/index.js
import Head from 'next/head'
import MDEditor from '@uiw/react-md-editor';
import '@uiw/react-md-editor/dist/markdown-editor.css'
import '@uiw/react-markdown-preview/dist/markdown.css';

export default function Home() {
  return (
    <div>
      <Head>
        <title>Create Next App</title>
        <meta name="description" content="Generated by create next app" />
      </Head>
      <MDEditor value="**Hello world!!!**" />
    </div>
  )
}