DCA testing

javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java

@@ -498,12 +498,9 @@ public int run() throws IOException {
         // ensuring that the finalize steps detects that no code was seen.
         Path srcFolder = Paths.get(EnvironmentVariables.getWipDatabase(), "src");
         try {
-          // Non-recursive delete because "src/" should be empty.
-          FileUtil8.delete(srcFolder);
+          FileUtil8.recursiveDelete(srcFolder);
         } catch (NoSuchFileException e) {
           Exceptions.ignore(e, "the directory did not exist");
-        } catch (DirectoryNotEmptyException e) {
-          Exceptions.ignore(e, "just leave the directory if it is not empty");
         }
         return 0;
       }

javascript/ql/integration-tests/diagnostics/syntax-error/good.js

@@ -0,0 +1,2 @@
+// Ensure at least one file without errors is included, as extraction fails otherwise.
+console.log("Hello")

javascript/ql/lib/qlpack.yml

@@ -23,3 +23,4 @@ dataExtensions:
   - semmle/javascript/security/domains/**/*.model.yml
   - ext/*.model.yml
 warnOnImplicitThis: true
+compileForOverlayEval: true

javascript/ql/lib/semmle/javascript/Tokens.qll

@@ -4,6 +4,13 @@
 
 import javascript
 
+private predicate adjacentTokens(Token token1, Token token2) {
+  exists(TopLevel top, int index |
+    tokeninfo(token1, _, top, index, _) and
+    tokeninfo(token2, _, top, index + 1, _)
+  )
+}
+
 /**
  * A token occurring in a piece of JavaScript source code.
  *
@@ -27,10 +34,7 @@ class Token extends Locatable, @token {
   string getValue() { tokeninfo(this, _, _, _, result) }
 
   /** Gets the token following this token inside the same toplevel structure, if any. */
-  Token getNextToken() {
-    this.getTopLevel() = result.getTopLevel() and
-    this.getIndex() + 1 = result.getIndex()
-  }
+  Token getNextToken() { adjacentTokens(this, result) }
 
   /** Gets the token preceding this token inside the same toplevel structure, if any. */
   Token getPreviousToken() { result.getNextToken() = this }