413
* Returns the collapsed value or undefined if not all sides are present.
414
*/
415
>
function collapseBoxValues(entries: Map<string, string>, sides: [string, string, string, string]): string | undefined {
cssHelpers.ts
416
>
const [topKey, rightKey, bottomKey, leftKey] = sides;
417
>
const top = entries.get(topKey);
418
>
const right = entries.get(rightKey);
419
>
const bottom = entries.get(bottomKey);
420
>
const left = entries.get(leftKey);
421
>
422
>
if (top === undefined || right === undefined || bottom === undefined || left === undefined) {
423
>
return undefined;
424
>
}
425
426
entries.delete(topKey);