fix(expo): key the offline resource cache by the full publishable key

[wobsoriano]

Description

The offline resource cache keyed entries by the last 5 characters of the publishable key, which most instances share. Switching instances could load the previous instance's cached user and session offline.

Cache keys now use the full publishable key

Resolves MOBILE-636

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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🦋 Changeset detected

Latest commit: 638662d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/expo	Patch

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📝 Walkthrough

Walkthrough

ResourceCache.init now uses the full publishable key after removing = characters when it creates an item key. Tests verify isolation between publishable keys with matching suffixes and validate the generated storage-key format. A patch changeset documents the Expo cache behavior.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to a7659

A narrow set of valid keys cannot use the offline cache reliably; encode the key characters before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: keying the Expo offline resource cache by the full publishable key.
Description check	✅ Passed	The description explains the cache-isolation bug, the implementation change, the resolved issue, and the reported validation results.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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commit: 638662d

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API Changes Report

Generated by Break Check on 2026-09-22T21:51:31.623Z

Summary

Metric	Count
Packages analyzed	19
Packages with changes	0
🔴 Breaking changes	0
🟡 Non-breaking changes	0
🟢 Additions	0

No API Changes Detected

All packages have stable APIs with no detected changes.

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Report generated by Break Check

_{Last ran on 638662d.}

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Actionable comments posted: 1

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Inline comments:
In `@packages/expo/src/cache/ResourceCache.ts`:
- Line 17: Update the publishable-key portion of the itemKey construction in
ResourceCache to use SecureStore-safe Base64 characters: replace plus signs with
hyphens, slashes with underscores, and remove padding equals signs before
concatenation. Preserve the existing key prefix and caching behavior.

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Reviewing files that changed from the base of the PR and between 9040302 and a765956.

📒 Files selected for processing (1)

• packages/expo/src/cache/ResourceCache.ts

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