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Asked: 2024-09-25T06:03:40+05:30 In:

In Visual Studio Code, why does Prettier modify my code and then mark it as an error?

I’ve been using Visual Studio Code for a while now, and I’ve started integrating Prettier into my workflow to format my code automatically. But lately, I’ve run into this super frustrating issue. So, here’s the deal: I edit my files, hit save, and voilà, Prettier jumps in and formats my code like it’s on a mission. I love that it keeps everything neat and tidy, but then – bam! – it starts marking some of my code as errors right after it formats it.

What’s really throwing me off is that sometimes it seems to alter the same lines that it’s marking as erroneous. I mean, why would it make a change just to say there’s something wrong with it afterward? For example, I’ll write a function, get Prettier to reformat it, and suddenly it tells me there’s an issue with how I’ve defined a parameter or something similar.

I’ve checked my settings, and my ESLint configuration seems to be in sync with Prettier (at least I think so). I’ve even tried disabling ESLint to see if it was conflicting, but the errors still pop up after Prettier runs its formatting magic. It’s kind of maddening because I’m left trying to solve a problem that seems to be self-created by using Prettier in the first place.

Another layer to this is that I’m not even sure what the errors mean sometimes. They could be something related to the indentation or specific syntax. The weird part is that some of my colleagues don’t seem to have this issue. I’m starting to wonder if I’ve accidentally set some odd rules in my config files or if there’s some hidden setting that I’m overlooking.

Has anyone else ever experienced this? What did you do to fix it? Do I need to dive deeper into my settings, or is there a conflict between Prettier and some other extension that I’m not aware of? Would appreciate any insights or advice on what I can try to get my formatting back on track without all the error confusion!

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    2 Answers



    1. Prettier and ESLint Confusion

      Struggling with Prettier and ESLint?

      It sounds like you’re dealing with a pretty frustrating issue! I’ve been there too, so let’s see if we can figure this out together.

      When Prettier formats your code and then instantly marks it as an error, it could be due to a few reasons. One thing to look into is that sometimes there might be conflicts between your ESLint rules and Prettier’s formatting style. Even if they seem to be in sync, there could be some rules that are still conflicting.

      Here are a few things you might want to try:

      • Check your ESLint config: Make sure there’s not anything in there that contradicts Prettier. You might want to use the eslint-config-prettier package to turn off all ESLint rules that conflict with Prettier.
      • Try using the Prettier ESLint plugin: This can help integrate the two tools better and ensure they work harmoniously. It formats your code and then runs ESLint afterward to check for issues.
      • Look at specific errors: Sometimes, the error messages might not make sense, but they can help point you to specific rules in your ESLint settings. Try checking what those rules are and if any need to be adjusted.
      • Check your workspace settings: If it works fine for your colleagues, there might be an issue with your local VS Code settings. Compare your settings with theirs to see if anything stands out.
      • Disable other extensions: Sometimes, other extensions can conflict with Prettier or ESLint. Try disabling them one by one to see if it resolves the issue.

      Don’t hesitate to dive deeper into your settings! Sometimes, the smallest tweak can make a big difference. If all else fails, reaching out on forums or communities could help too – someone might have faced the same issue!

      Good luck! Hope you get your code formatting back on track without the pesky errors!



    2. The issues you are experiencing with Prettier marking your code as erroneous after formatting could stem from a few common pitfalls in configuration. One potential culprit is the interaction between Prettier and ESLint rules that might not align perfectly. Even if you’ve verified that both configurations are synchronized, there may be certain rules in your ESLint configuration that are in conflict with the Prettier formatting. For instance, if your ESLint is configured to enforce specific parameter styles, and Prettier modifies the formatting in a way that contradicts those rules, ESLint will flag those changes as errors post-format. To troubleshoot this, consider using eslint-config-prettier, a package designed to disable all ESLint rules that conflict with Prettier. This ensures that ESLint focuses on issues that Prettier won’t handle, thus reducing potential conflicts.

      Another aspect to investigate is your VS Code extensions and their configuration, as there may be others like TypeScript or style linting tools that impose additional rules. You might want to simplify your setup temporarily by disabling non-essential extensions and gradually enabling them to pinpoint any conflicts. Additionally, ensure that your editor’s settings for formatting on save and linting are properly configured to work in tandem. If errors remain ambiguous, consult the documentation for both Prettier and ESLint to clarify what those specific messages mean—you may find that refining your explicit rule settings can resolve much of the confusion. Lastly, it may also be beneficial to check if your colleagues share the same project configurations to identify discrepancies that could lead to differences in behavior.


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