Restore to commit 74e578279624c6045ca440a3459ebfa1f8d54191

scripts/_find_js_error.js

@@ -0,0 +1,14 @@
+const fs=require('fs');
+const path='chat/public/builder.js';
+const src=fs.readFileSync(path,'utf8');
+let lo=0,hi=src.length,mid;let lastGood=0;
+while(lo<hi){mid=Math.floor((lo+hi)/2);
+ try{new Function(src.slice(0,mid)); lastGood=mid; lo=mid+1;}catch(e){hi=mid;}
+}
+const start=Math.max(0,lastGood-200), end=Math.min(src.length, lastGood+200);
+const context=src.slice(start,end);
+const before=src.slice(0,lastGood);
+const linesBefore=before.split('\n').length;
+console.log('approx failure at char index', lastGood, 'around line', linesBefore);
+console.log('---context---');
+console.log(context);