Alert: The `className` property did not align and there is an absence of the window within the Next 13 App Router

Question

Alert: The `className` property did not align and there is an absence of the window within the Next 13 App Router

I've been struggling to fix an error in the Next.js 13 App Router.

Warning: Prop `className` did not match. 
Server: "styled__HeadLink-sc-6589f63-0 fIOFTm" 
Client: "styled__HeadLink-sc-b76127ed-0 jzAIeh"

I've spent a lot of time searching online for solutions to this issue. Errors can be quite challenging to pinpoint and resolve.

To address this problem, I followed advice from various online sources.

Here is my .babelrc configuration:

{
  "env": {
    "development": {
      "presets": ["next/babel"],
      "plugins": [["babel-plugin-styled-components", { "ssr": true, "displayName": true, "preprocess": false }]]
    },
    "production": {
      "plugins": [["babel-plugin-styled-components", { "ssr": true, "displayName": true, "preprocess": false }]],
      "presets": ["next/babel"]
    },
    "test": {
      "presets": ["next/babel"]
    }
  },
  "plugins": [["babel-plugin-styled-components", { "ssr": true, "displayName": true, "preprocess": false }]]
}

And here is my next.config.js setup:

reactStrictMode: false,
  compiler: {
    styledComponents: true,
  },

In my code, I used window checks like this:

export const isClient = () => typeof window !== 'undefined';

I also attempted to use next/dynamic as shown below:

export default dynamic(() => Promise.resolve(VeryTroubleBlock), { ssr: false });

The root of the issue seems to lie in the initial rendering of Swiper on specific pages.

const isTablet = useAdaptiveSize(Breakpoints.tablet);
const isMobile = useAdaptiveSize(Breakpoints.mobile);

// Swiper component usage here...

export default dynamic(() => Promise.resolve(VeryTroubleBlock), { ssr: false });

My custom hook implementation looks like this:

import { isClient } from '@/utils/client-check';
import { useState, useLayoutEffect } from 'react';
import { useWindowSize } from 'usehooks-ts';

export function useAdaptiveSize(size: number): boolean {
  // Hook logic here...
}

While my custom hook resolved the issue on one page, it persists on another where Swiper is being utilized.

To eliminate the "Warning: Prop className did not match" error, replacing the custom hook execution with

innerWidth < Breakpoints.tablet

should work. However, this may lead to a server-side console error due to window is not defined.

I welcome any feedback and assistance in resolving this issue.

Have a wonderful day!

javascript next.js window warnings

Answer 1

Answer №1

Issue: The problem arose when I realized that my global styles were written in CSS, while the rest of the styles were implemented using styled-components.

Solution: In order to tackle this issue effectively, I made the decision to transition completely to utilizing Styled-components for all styling requirements. This ensured a cohesive styling approach and maintained consistency in styling across both server-side and client-side rendering processes. Additionally, I made a specific change by eliminating the use of React.Fragment <></> within the StyleSheetManager during the return styles phase.

'use client';

import React, { useState } from 'react';
import { useServerInsertedHTML } from 'next/navigation';
import { ServerStyleSheet, StyleSheetManager } from 'styled-components';

export default function StyledComponentsRegistry({ children }: { children: React.ReactNode }) {
  // Create stylesheet only once with lazy initial state
  // x-ref: https://reactjs.org/docs/hooks-reference.html#lazy-initial-state
  const [styledComponentsStyleSheet] = useState(() => new ServerStyleSheet());

  useServerInsertedHTML(() => {
    const styles = styledComponentsStyleSheet.getStyleElement();
    styledComponentsStyleSheet.instance.clearTag();
    return styles;
  });

  if (typeof window !== 'undefined') return <>{children}</>;

  return <StyleSheetManager sheet={styledComponentsStyleSheet.instance}>{children}</StyleSheetManager>;
}

Answer 2

Issue: The problem arose when I realized that my global styles were written in CSS, while the rest of the styles were implemented using styled-components.

Solution: In order to tackle this issue effectively, I made the decision to transition completely to utilizing Styled-components for all styling requirements. This ensured a cohesive styling approach and maintained consistency in styling across both server-side and client-side rendering processes. Additionally, I made a specific change by eliminating the use of React.Fragment <></> within the StyleSheetManager during the return styles phase.

'use client';

import React, { useState } from 'react';
import { useServerInsertedHTML } from 'next/navigation';
import { ServerStyleSheet, StyleSheetManager } from 'styled-components';

export default function StyledComponentsRegistry({ children }: { children: React.ReactNode }) {
  // Create stylesheet only once with lazy initial state
  // x-ref: https://reactjs.org/docs/hooks-reference.html#lazy-initial-state
  const [styledComponentsStyleSheet] = useState(() => new ServerStyleSheet());

  useServerInsertedHTML(() => {
    const styles = styledComponentsStyleSheet.getStyleElement();
    styledComponentsStyleSheet.instance.clearTag();
    return styles;
  });

  if (typeof window !== 'undefined') return <>{children}</>;

  return <StyleSheetManager sheet={styledComponentsStyleSheet.instance}>{children}</StyleSheetManager>;
}

Alert: The `className` property did not align and there is an absence of the window within the Next 13 App Router

Answer №1

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