tools: shorten metadata parsing

PR-URL: #19512
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: tniessen

tools/doc/common.js

@@ -13,31 +13,28 @@ function arrify(value) {
 }
 
 functionextractAndParseYAML(text){
-text=text.trim();
-
-text=text.replace(/^<!--YAML/,'')
+text=text.trim()
+.replace(/^<!--YAML/,'')
 .replace(/-->$/,'');
 
 // js-yaml.safeLoad() throws on error
 constmeta=yaml.safeLoad(text);
 
-constadded=meta.added;
-if(added){
+if(meta.added){
 // Since semver-minors can trickle down to previous major versions,
 // features may have been added in multiple versions.
-meta.added=arrify(added);
+meta.added=arrify(meta.added);
 }
 
-constdeprecated=meta.deprecated;
-if(deprecated){
+if(meta.deprecated){
 // Treat deprecated like added for consistency.
-meta.deprecated=arrify(deprecated);
+meta.deprecated=arrify(meta.deprecated);
 }
 
 meta.changes=meta.changes||[];
-meta.changes.forEach((entry)=>{
+for(constentryofmeta.changes){
 entry.description=entry.description.replace(/^\^\s*/,'');
-});
+}
 
 returnmeta;
 }