Disable PostCSS deprecation warning

Describe the bug Starting Storybook 6.2+ will trigger a deprecation warning, which will make the console output look quite noisy. The warning is about deprecating the implicit PostCSS loader, which is guess is fine to show… if it’s actually being used. I’m not using any CSS in our project, and so I don’t want such a warning to clutter the console output. My OCD wants to do away with warnings 😀, but this one seems to be hardcoded into Storybook.

In the source I can see that it’s always generating that warning for everyone. Except if you explicitly add addon-postcss.

This seems backwards to me. Why should I add an addon that I don’t need, in order to hide a warning about its functionality that I wasn’t using in the first place??

To Reproduce Steps to reproduce the behavior:

1. Make sure not to have any CSS in the project
2. Make sure not to accidentally install postcss-addon
3. Start Storybook 6.2
4. Watch the console.

Expected behavior If not using PostCSS: don’t bother the console with it. If using PostCSS: do warn about installing the addon.

Screenshots

System Please paste the results of npx sb@next info here.

Environment Info:

  System:
    OS: Windows 10 10.0.19042
    CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
  Binaries:
    Node: 14.16.0 - C:\Program Files\nodejs\node.EXE
    npm: 6.14.11 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 89.0.4389.114
    Edge: Spartan (44.19041.423.0), Chromium (89.0.774.63)
  npmPackages:
    @storybook/addon-docs: 6.2.1 => 6.2.1
    @storybook/addon-links: 6.2.1 => 6.2.1
    @storybook/addons: 6.2.1 => 6.2.1
    @storybook/react: 6.2.1 => 6.2.1

┆Issue is synchronized with this Asana task by Unito

[JohnCasab]

If you dont use Postcss you can paste this in your .storybook/main.js

module.exports = {
  features: {
    postcss: false,
  },
};

As suggested in the documentation: https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#deprecated-implicit-postcss-loader

[shilman]

Crikey!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.2.3 containing PR #14478 that references this issue. Upgrade today to the @latest NPM tag to try it out!

npx sb upgrade

Closing this issue. Please re-open if you think there’s still more to do.