feat: custom storage

[zhukaihan]

Custom storage interface and default implementation.

[Copilot]

Pull Request Overview

This PR adds support for custom storage implementations in the Experiment client. The change allows users to provide their own storage backend while maintaining backward compatibility with the default AsyncStorage implementation.

Key changes:

• Modified the Storage interface's get method to return Promise<string | null> instead of Promise<string> to match AsyncStorage's behavior
• Added a storage configuration option to ExperimentConfig that accepts custom Storage implementations
• Exported the Storage type from the main index to make it available to SDK consumers

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/types/storage.ts	Updated return type of get method to include null
src/types/config.ts	Added optional storage field to ExperimentConfig and included it in defaults
src/storage/local-storage.ts	Updated LocalStorage.get return type to match interface
src/storage/cache.ts	Removed default LocalStorage instantiation and unused import
src/index.ts	Exported storage types for public API
src/experimentClient.ts	Added logic to use custom storage or default to LocalStorage
tests/client.test.ts	Added tests for custom storage functionality
mocks/setup.ts	Added type assertion for navigator mock

Comments suppressed due to low confidence (1)

src/storage/cache.ts:76

• The JSON.parse(rawValues) will throw an error if rawValues is null, which is now a valid return type from storage.get(). Add a null check before parsing: if (!rawValues) return; before line 76, or change the parsing to jsonValues = rawValues ? JSON.parse(rawValues) : {};

      jsonValues = JSON.parse(rawValues) || {};

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