SharedArrayBuffer usage is restricted to cross-origin isolated sites

[Frikki]

What's the problem?
When running storybook (only in dev, not build), the following warning is presented in the console in Chrome Version 90.0.4430.85 (Official Build) (x86_64):

SharedArrayBuffer usage is restricted to cross-origin isolated sites
SharedArrayBuffers (SABs) can be used to construct high-resolution timers. High-resolution timers simplify Spectre attacks on cross-origin resources.
To mitigate security risks across browsers, SharedArrayBuffers are gated behind cross-origin isolated contexts starting with Chrome 91 (May 2021). To continue using SharedArrayBuffers, please ensure that this page opts-into cross-origin isolation by setting Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy appropriately.
Note that for each iframe, only the first issue is reported for performance reasons.

Additional context
The warning comes from React and has been resolved in React 17.0.2

Since storybook depends on React, I believe that this issue is relevant.

[sibelius]

is this fixed?

[shilman]

We’re cleaning house! Storybook has changed a lot since this issue was created and we don’t know if it’s still valid. Please open a new issue referencing this one if:

• this is still a problem in SB 7.x
• you can provide a consistent reproduction in 7.x (at https://storybook.new/ or per repro docs).