api: return defaultValue in useParameter if story is not prepared #18887
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it was returning an empty object before, which is a breaking change.
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What I did
Given the changes in Storybook 7.0, when calling
useParameterand a story existed but hadstory.prepared === false, the code was returning an empty object rather than just null, which is a breaking change and broke addons that relied on the value beingundefined.How to test
If your answer is yes to any of these, please make sure to include it in your PR.