https://github.com/jayphelps/gatsby-dev-ssr-issue

https://github.com/jayphelps/gatsby-dev-ssr-issue

Last synced: 16 days ago
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• Host: GitHub
• URL: https://github.com/jayphelps/gatsby-dev-ssr-issue
• Owner: jayphelps
• Created: 2021-03-01T17:09:04.000Z (almost 4 years ago)
• Default Branch: master
• Last Pushed: 2021-03-01T17:39:53.000Z (almost 4 years ago)
• Last Synced: 2024-10-19T17:58:33.116Z (3 months ago)
• Language: JavaScript
• Size: 353 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Reproducing in Gatsby app

```shell

npm install

npm run develop

```

To reproduce the issue, edit this [src/pages/index.js](src/pages/index.js) component, then do a full page refresh.

## Source code for @jayphelps/fake-package

```js

if (globalThis.fakePackageHasBeenImported) {

  throw new Error(

    'globalThis.fakePackageHasBeenImported has already been set to true, meaning this module has been duplicated and evaluated more than once within the same JS isolate.',

  );

}

globalThis.fakePackageHasBeenImported = true;

```

## Comparison of Next.js behavior

```shell

cd nextjs-app

npm install

npm run dev

```

Because it's helpful to see what others in the community have already done about this problem, I've included a Next.js app that does the same thing, but where the problem does not happen because it only evaluates node_modules once; it does not duplicate them.

Note, however, the problem does happen if your own Next.js app's code has global state, like it does in Gatsby too. That's a much harder problem to solve, and not an issue for me personally right now, just mentioning for clarity.