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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | /**
* Copies the attributes that have a value, and drops the rest.
*
* A metadata provider answers a module as a whole, so an attribute the instance
* does not carry arrives as a key whose value is `undefined`. Merging that key
* clears a real value on the destination, so this drops it instead.
*
* @param source - the object to copy. A `null` or `undefined` source gives `{}`.
* @returns a new object that holds only the attributes with a defined value
*
* @example
* ```ts
* const dataset = {
* ...newInstanceData,
* ...definedAttributesOf(metaData.get(MetadataModules.SERIES_DATA, imageId)),
* };
* ```
*/
export function definedAttributesOf<T extends object>(
source: T | null | undefined
): Partial<T> {
const result: Partial<T> = {};
if (!source) {
return result;
}
for (const key of Object.keys(source) as (keyof T)[]) {
const value = source[key];
if (value !== undefined) {
result[key] = value;
}
}
return result;
}
export default definedAttributesOf;
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