Serialize Error.cause when degrading storage

[roryabraham]

Details

When storage degrades to cache-only, the fallback alert interpolated error.cause directly. A non-string cause becomes [object Object] in logs.

Serialize Error.cause to a message string (Error message, or the string itself) before logging.

Split out of #802.

Related Issues

For #802

Linked E/App PR

Expensify/App#99225

Automated Tests

No new tests. Logging-only change in degradePerformance.

Manual Tests

1. Open the Expensify App against this Onyx SHA.
2. Use the app normally so storage writes succeed.
3. If a storage degrade occurs, confirm the Cause field in the Hmmm log is a readable string, not [object Object].

Author Checklist

• I linked the correct issue in the ### Related Issues section above
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• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
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  • Android / Chrome
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  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
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• I verified any variables that can be defined as constants (ie. in CONST.js or at the top of the file that uses the constant) are defined as such
• I verified that if a function's arguments changed that all usages have also been updated correctly
• If a new component is created I verified that:
  • A similar component doesn't exist in the codebase
  • All props are defined accurately and each prop has a /** comment above it */
  • The file is named correctly
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  • The only data being stored in the state is data necessary for rendering and nothing else
  • If we are not using the full Onyx data that we loaded, I've added the proper selector in order to ensure the component only re-renders when the data it is using changes
  • For Class Components, any internal methods passed to components event handlers are bound to this properly so there are no scoping issues (i.e. for onClick={this.submit} the method this.submit should be bound to this in the constructor)
  • Any internal methods bound to this are necessary to be bound (i.e. avoid this.submit = this.submit.bind(this); if this.submit is never passed to a component event handler like onClick)
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  • The component has the minimum amount of code necessary for its purpose, and it is broken down into smaller components in order to separate concerns and functions
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• I have checked off every checkbox in the PR author checklist, including those that don't apply to this PR.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[roryabraham]

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Preserve non-Error cause details

When Error.cause is a valid non-string value that is not an Error instance—such as {message: 'quota denied'} or an error from another JavaScript realm—this leaves causeMessage empty, so the resulting alert contains only Cause: and loses the diagnostic information this change is intended to make readable. Safely serialize these remaining cause values or extract their message rather than discarding them.

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[roryabraham]

Same class of nit as the #826 cross-realm comment.

degradePerformance only runs on our own new Error('IDBKeyVal store could not be created') from this window. We never attach a plain-object cause, and we do not run this path in an iframe that would produce a foreign-realm Error.

The point of this PR is to stop interpolating a raw cause object as [object Object]. Serializing arbitrary leftover values would reintroduce that. Error and string cover every cause we actually set.

Not changing this.

[os-botify]

🚀 Published to npm in 3.0.105 🎉