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SSR for MUI createTheme with NextJs

Longtime C# dev, just starting nextjs for a client.

I'm using MUI, and basically have a day of work in, so my project is pretty small. I have a decent handle on how SSR works conceptually, but implementation is throwing me for a weird loop.

Here's my layout.js:

<!-- language:javascript -->
import "./globals.css";
import {
  Drawer,
  ListItemButton,
  ListItemIcon,
  ListItemText,
  List,
  AppBar,
  Toolbar,
  Typography,
  Box,
} from "@mui/material";
import AssessmentIcon from "@mui/icons-material/Assessment";
import AddIcon from "@mui/icons-material/Add";
import FormatListBulletedIcon from "@mui/icons-material/FormatListBulleted";
import zIndex from "@mui/material/styles/zIndex";
import { theme } from "./theme";
import { ThemeProvider } from "@mui/material/styles";

const navItems = [
  { name: "Create New", icon: <AddIcon />, url: "todo" },
  { name: "View all", icon: <FormatListBulletedIcon />, url: "todo" },
  { name: "Dashboard", icon: <AssessmentIcon />, url: "todo" },
];

const getNav = () => {
  console.log(navItems);
  return (
    <List>
      {navItems.map((item, index) => (
        <ListItemButton className="navbutton" href={item.url} key={index}>
          <ListItemIcon>{item.icon}</ListItemIcon>
          <ListItemText>{item.name}</ListItemText>
        </ListItemButton>
      ))}
    </List>
  );
};

export const metadata = {
  title: "Create Next App",
  description: "Generated by create next app",
};

export default function RootLayout({ children }) {
  return (
    <html lang="en">
      <body>
        <ThemeProvider theme={theme}>
          <AppBar position="relative" sx=>
            <Toolbar>
              <Typography varient="h4">
                --client info--
              </Typography>
            </Toolbar>{" "}
          </AppBar>
          <Drawer anchor={"left"} variant="permanent">
            {getNav()}
          </Drawer>
          <main>{children}</main>
        </ThemeProvider>
      </body>
    </html>
  );
}

and my friendly little theme.js:

<!-- language:javascript -->
import { createTheme } from "@mui/material/styles";

export default theme = createTheme({
  typography: {
    allVariants: {
      fontFamily: "Trebuchet MS",
    },
  },
});

I'm consistently getting "Error: Attempted to call createTheme() from the server but createTheme is on the client. It's not possible to invoke a client function from the server, it can only be rendered as a Component or passed to props of a Client Component."

I don't really understand the why here. I've tried a few variations of UseEffect and "use client";.

As I understand it.... this font should render server side? Right? I feel like I'm taking crazy pills.

Thanks in advance

Tried use client syntax, more strange errors, I think fundamentally this should be rendered server side and I don't understand the meaning of the error.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/FwU4g8N
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