✨ localStorage strategy for remote configuration#4071
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✨ localStorage strategy for remote configuration#4071
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localStorage strategy for remote configuration
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Add 4 new E2E tests for the localStorage strategy: 1. Basic localStorage retrieval - reads simple string values 2. localStorage with regex extractor - parses extracted values 3. Missing key handling - gracefully falls back when key doesn't exist 4. localStorage unavailable - handles access errors and falls back Tests follow the same pattern as the js strategy tests (PR #3766) and validate: - Synchronous value resolution during SDK initialization - Regex extraction functionality - Fallback behavior for missing or inaccessible keys - Integration with both CDN and npm setups Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
When a remote configuration value fails to resolve (e.g., localStorage key is missing or access fails), the system now preserves the initial configuration fallback value instead of overwriting it with undefined. This fixes the issue where the SDK would lose the fallback version when: - localStorage key is not found - localStorage access throws an error - Any other dynamic resolution returns undefined The fix adds an undefined check before assigning resolved values, ensuring that undefined values do not override the initial configuration. Fixes E2E tests: - should resolve to undefined when localStorage key is missing - should handle localStorage access failure gracefully Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
…ng comment Restore 'electron' union members removed by the submodule bump (unrelated to the localStorage feature) and add a comment explaining the undefined preservation logic in applyRemoteConfiguration. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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packages/rum-core/src/domain/configuration/remoteConfiguration.ts
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| expect(initConfiguration.version).toBe('fallback-version') | ||
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| createTest('should handle localStorage access failure gracefully') |
packages/rum-core/src/domain/configuration/remoteConfiguration.spec.ts
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packages/rum-core/src/domain/configuration/remoteConfiguration.spec.ts
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Remove the `if (resolvedValue !== undefined)` guard since no property
currently supports both init config and dynamic config override. Revert
test expectations to `{ version: undefined }`, rename cookie missing
test, and update E2E tests accordingly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Motivation
Remote configuration lets customers tweak their Browser SDK settings (sample rates, privacy levels, tracing URLs, user context, etc.) from the Datadog UI without redeploying their app. At init, the SDK fetches a JSON config and applies it on top of the
init()options.Dynamic options can resolve values at runtime from different sources using a strategy-based approach — JavaScript variables (
js), cookies (cookie), or DOM elements (dom). ButlocalStoragewasn't supported, even though it's a super common way for apps to store metadata like version strings or user IDs.Changes
Adds
localStorageas a new strategy for remote configuration dynamic options.localStoragestrategy in the remote config types and schemaresolveLocalStorageValue()with error handling for whenlocalStorageaccess throwslocalStorageresolution (success,missing,failure)extractor(same as other strategies)Test instructions
No backend ready for it yet.
Checklist