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Add missing JSDoc @returns #1371

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Add missing JSDoc @returns #1371

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4 changes: 3 additions & 1 deletion ts/a11y/explorer/KeyExplorer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1835,8 +1835,9 @@ function parse(tokens: string[]): SexpTree {
*
* @param {SexpTree} tree The sexpression tree.
* @param {Map<string, Set<string>>} map The map to populate.
* @returns {Set<string>} The descendant map.
*/
function buildMap(tree: SexpTree, map: Map<string, Set<string>>) {
function buildMap(tree: SexpTree, map: Map<string, Set<string>>): Set<string> {
if (typeof tree === 'string') {
if (!map.has(tree)) map.set(tree, new Set());
return new Set();
Expand All @@ -1860,6 +1861,7 @@ function buildMap(tree: SexpTree, map: Map<string, Set<string>>) {
*
* @param {Set<string>} a Initial set.
* @param {Set<string>} b Set to remove from A.
* @returns {Set<string>} The difference A\B.
*/
function setdifference(a: Set<string>, b: Set<string>): Set<string> {
if (!a) {
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