renamed "isExterns" to "is_externs"

javascript/ql/src/semmle/javascript/AST.qll

@@ -221,7 +221,7 @@ class TopLevel extends @toplevel, StmtContainer {
   /** Holds if this toplevel is an externs definitions file. */
   predicate isExterns() {
     // either it was explicitly extracted as an externs file...
-    isExterns(this)
+    is_externs(this)
     or
     // ...or it has a comment with an `@externs` tag in it
     exists(JSDocTag externs |

javascript/ql/src/semmle/javascript/Aliases.qll

@@ -67,3 +67,8 @@ class XorBitwiseExpr = XOrExpr;
 
 // Aliases for deprecated predicates from the dbscheme
  
+/**
+ * Alias for the predicate `is_externs` defined in the .dbscheme.
+ * Use `TopLevel#isExterns()` instead.
+ */ 
+deprecated predicate isExterns(TopLevel toplevel) { is_externs(toplevel) }

javascript/ql/src/semmlecode.javascript.dbscheme

@@ -118,7 +118,7 @@ filetype(
 toplevels (unique int id: @toplevel,
            int kind: int ref);
 
-isExterns (int toplevel: @toplevel ref);
+is_externs (int toplevel: @toplevel ref);
 
 case @toplevel.kind of
    0 = @script

javascript/ql/src/semmlecode.javascript.dbscheme.stats

@@ -7897,7 +7897,7 @@
 </dependencies>
 </relation>
 <relation>
-<name>isExterns</name>
+<name>is_externs</name>
 <cardinality>44</cardinality>
 <columnsizes>
 <e>