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env vars in a React Vite app

Useful for dynamically generating tags in the index.html entry point file.

Define environment variables with VITE_ prefix in .env file, e.g.

VITE_REACT_APP_VERSION=$npm_package_version
VITE_APP_TITLE="Title of the website"
VITE_APP_DESCRIPTION="React (Vite) app using socket.io and Node.js Express backend"

Then in the index.html entry point file, the following

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta
        name="description"
        content="%VITE_APP_DESCRIPTION%"
    />
    <meta
        name="version"
        content="%VITE_REACT_APP_VERSION%"
    />
    <title>%VITE_APP_TITLE%</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/main.jsx"></script>
  </body>
</html>

will generate something like this:

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta
        name="description"
        content="React (Vite) app using socket.io and Node.js Express backend"
    />
    <meta
        name="version"
        content="0.0.0"
    />
    <title>Title of the website</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/main.jsx"></script>
  </body>
</html>