feat(smithy-client): support strict union parsing #2746
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| const setKeys = new Set<string>(); | ||
| for (const [key, value] of Object.entries(asObject)) { | ||
| if (value !== null && value !== undefined) { | ||
| setKeys.add(key); | ||
| } | ||
| } |
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Is the Set really needed? Since we are validating the object has exactly 1 key, and JS object doesn't allow multiple entries under same key, why not just Object.keys(asObject)?.length !== 1?
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You can have multiple keys where only one is not null - { a: 1, b: null, c: null } is a valid union (and a check of the # of keys would fail in this case, I think)
Set isn't being used here as a way to deduplicate. I just used it because order doesn't matter and object keys are expected to be unique anyway.
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Since Object.entries already returns a collection, it's looks unnecessary to create a Set explicitly. Will this do?
const isDefined = (value: unknow): boolean => value !== null && value !== undefined;
if (Object.values(asObject).filter(isDefined).length !== 1) {
throw new TypeError(`Unions must have exactly one non-null member`);
}
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I'd like to include which keys were non-null in the error message when more than one key is set, which I can't do if I just filter the values.
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The suggested way is more idiomatic. But we don't feel strong about it.
Unions must be JSON objects that only have one key set.
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Description
Unions must be JSON objects that only have one key set.
Testing
Unit tests, and protocol tests against regenerated clients.
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