`@storybook/addon-a11y`'s `withA11y` slowing down the storybook that results in browser hanging

Describe the bug Usage of withA11y of @storybook/addon-a11y is slowing down the storybooks and resulting in browser hanging

To Reproduce Steps to reproduce the behavior:

1. Clone the repository: https://github.com/MansoorBashaBellary/vue-cli-storybook
2. Do yarn && yarn start on the cloned repo
3. Click on the Changelog story of Welcome and observe that browser gets hung for sometime and slows down the storybooks

Changelog story has Changelog of across 1500 lines. And it is happening due to the inclusion of withA11y decorator in config.js.

On removing below 2 lines from config.js fixes the issue:

import { withA11y } from ‘@storybook/addon-a11y’; addDecorator(withA11y);

This issue was not happening in SB 4.0, it started happening in SB 5.0

Expected behavior Browser should not get hung on using withA11y decorator

Code snippets Reproduction URL attached above

System:

• OS: All
• Device: All
• Browser: All
• Framework: All
• Addons: A11y
• Version: 5.0.0

[mbellary-chwy]

Thanks @jsomsanith. Using the above version specified fixes the issue. Closing this issue

[jsomsanith-tlnd]

@MansoorBashaBellary I haven’t tried your repo yet, but the description seems to match this issue : https://github.com/storybooks/storybook/issues/5973

I fixed it and it’s scheduled for 5.1. Can you try the 5.1 alpha.6+ please ?