Sample of generation of dot graph from javascript source

queries/printast.ql

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+/**
+ * @name Print AST
+ * @kind graph
+ */
+
+import javascript
+import semmle.javascript.PrintAst
+
+class PrintAstConfigurationOverride extends PrintAstConfiguration {
+    override predicate shouldPrint(Locatable e, Location l) {
+        super.shouldPrint(e, l) and
+        l.getFile().getBaseName() = "callbacks.js"
+    }
+}
+// from File f
+// where f.getBaseName() = "callbacks.js"
+// select f

queries/qlpack.yml

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+name: codeql-custom-queries-javascript
+version: 0.0.0
+libraryPathDependencies: codeql-javascript

queries/queries.xml

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+<queries language="javascript"/>