tools: use Set instead of{[key]: true } object

Refs: #41675 PR-URL: #41695 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Mestery <[email protected]> Reviewed-By: Mohammed Keyvanzadeh <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>

Author: tniessen

tools/doc/alljson.mjs

@@ -23,17 +23,14 @@ const results ={
 
 // Identify files that should be skipped. As files are processed, they
 // are added to this list to prevent dupes.
-constseen={
-'all.json': true,
-'index.json': true
-};
+constseen=newSet(['all.json','index.json']);
 
 // Extract (and concatenate) the selected data from each document.
 // Expand hrefs found in json to include source HTML file.
 for(constlinkoftoc.match(/<a.*?>/g)){
 consthref=/href="(.*?)"/.exec(link)[1];
 constjson=href.replace('.html','.json');
-if(!jsonFiles.includes(json)||seen[json])continue;
+if(!jsonFiles.includes(json)||seen.has(json))continue;
 constdata=JSON.parse(
 fs.readFileSync(newURL(`./${json}`,source),'utf8')
 .replace(/<ahref=\\"#/g,`<a href=\\"${href}#`)
@@ -49,7 +46,7 @@ for (const link of toc.match(/<a.*?>/g)){
 }
 
 // Mark source as seen.
-seen[json]=true;
+seen.add(json);
 }
 
 // Write results.