diff --git a/core/modules/wiki-extract.js b/core/modules/wiki-extract.js
new file mode 100644
index 000000000..9f4aad588
--- /dev/null
+++ b/core/modules/wiki-extract.js
@@ -0,0 +1,90 @@
+/*\
+title: $:/core/modules/wiki-extract.js
+type: application/javascript
+module-type: wikimethod
+
+AST information extractor for indexers.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Return an array of tiddler titles that are directly transcluded within the given parse tree. `title` is the tiddler being parsed, we will ignore its self-referential transclusions, only return
+*/
+exports.extractTranscludes = function(parseTreeRoot, title) {
+  // Count up the transcludes
+  var transcludes = [],
+    checkParseTree = function(parseTree, parentNode) {
+      for(var t=0; t<parseTree.length; t++) {
+        var parseTreeNode = parseTree[t];
+        if(parseTreeNode.type === "transclude") {
+          if(parseTreeNode.attributes.$tiddler && parseTreeNode.attributes.$tiddler.type === "string") {
+            var value;
+            // if it is Transclusion with Templates like `{{Index||$:/core/ui/TagTemplate}}`, the `$tiddler` will point to the template. We need to find the actual target tiddler from parent node
+            if(parentNode && parentNode.type === "tiddler" && parentNode.attributes.tiddler && parentNode.attributes.tiddler.type === "string") {
+              // Empty value (like `{{!!field}}`) means self-referential transclusion. 
+              value = parentNode.attributes.tiddler.value || title;
+            } else {
+              value = parseTreeNode.attributes.$tiddler.value;
+            }
+          } else if(parseTreeNode.attributes.tiddler && parseTreeNode.attributes.tiddler.type === "string") {
+            // Old transclude widget usage
+            value = parseTreeNode.attributes.tiddler.value;
+          } else if(parseTreeNode.attributes.$field && parseTreeNode.attributes.$field.type === "string") {
+            // Empty value (like `<$transclude $field='created'/>`) means self-referential transclusion. 
+            value = title;
+          } else if(parseTreeNode.attributes.field && parseTreeNode.attributes.field.type === "string") {
+            // Old usage with Empty value (like `<$transclude field='created'/>`)
+            value = title;
+          }
+          // Deduplicate the result.
+          if(value && transcludes.indexOf(value) === -1) {
+            transcludes.push(value);
+          }
+        }
+        if(parseTreeNode.children) {
+          checkParseTree(parseTreeNode.children, parseTreeNode);
+        }
+      }
+    };
+  checkParseTree(parseTreeRoot);
+  return transcludes;
+};
+
+
+/*
+Return an array of tiddler titles that are transcluded from the specified tiddler
+*/
+exports.getTiddlerTranscludes = function(title) {
+  var self = this;
+  // We'll cache the transcludes so they only get computed if the tiddler changes
+  return this.getCacheForTiddler(title,"transcludes",function() {
+    // Parse the tiddler
+    var parser = self.parseTiddler(title);
+    if(parser) {
+      // this will ignore self-referential transclusions from `title`
+      return self.extractTranscludes(parser.tree, title);
+    }
+    return [];
+  });
+};
+
+/*
+Return an array of tiddler titles that transclude to the specified tiddler
+*/
+exports.getTiddlerBacktranscludes = function(targetTitle) {
+  var self = this,
+    backIndexer = this.getIndexer("BackIndexer"),
+    backtranscludes = backIndexer && backIndexer.subIndexers.transclude.lookup(targetTitle);
+
+  if(!backtranscludes) {
+    backtranscludes = [];
+  }
+  return backtranscludes;
+};
+
+})();
diff --git a/core/modules/wiki.js b/core/modules/wiki.js
index d57fd6098..dcb62d7d3 100755
--- a/core/modules/wiki.js
+++ b/core/modules/wiki.js
@@ -549,82 +549,6 @@ exports.getTiddlerBacklinks = function(targetTitle) {
 	return backlinks;
 };
 
-
-/*
-Return an array of tiddler titles that are directly transcluded within the given parse tree. `title` is the tiddler being parsed, we will ignore its self-referential transclusions, only return
- */
-exports.extractTranscludes = function(parseTreeRoot, title) {
-	// Count up the transcludes
-	var transcludes = [],
-		checkParseTree = function(parseTree, parentNode) {
-			for(var t=0; t<parseTree.length; t++) {
-				var parseTreeNode = parseTree[t];
-				if(parseTreeNode.type === "transclude") {
-					if(parseTreeNode.attributes.$tiddler && parseTreeNode.attributes.$tiddler.type === "string") {
-						var value;
-						// if it is Transclusion with Templates like `{{Index||$:/core/ui/TagTemplate}}`, the `$tiddler` will point to the template. We need to find the actual target tiddler from parent node
-						if(parentNode && parentNode.type === "tiddler" && parentNode.attributes.tiddler && parentNode.attributes.tiddler.type === "string") {
-							// Empty value (like `{{!!field}}`) means self-referential transclusion. 
-							value = parentNode.attributes.tiddler.value || title;
-						} else {
-							value = parseTreeNode.attributes.$tiddler.value;
-						}
-					} else if(parseTreeNode.attributes.tiddler && parseTreeNode.attributes.tiddler.type === "string") {
-						// Old transclude widget usage
-						value = parseTreeNode.attributes.tiddler.value;
-					} else if(parseTreeNode.attributes.$field && parseTreeNode.attributes.$field.type === "string") {
-						// Empty value (like `<$transclude $field='created'/>`) means self-referential transclusion. 
-						value = title;
-					} else if(parseTreeNode.attributes.field && parseTreeNode.attributes.field.type === "string") {
-						// Old usage with Empty value (like `<$transclude field='created'/>`)
-						value = title;
-					}
-					// Deduplicate the result.
-					if(value && transcludes.indexOf(value) === -1) {
-						transcludes.push(value);
-					}
-				}
-				if(parseTreeNode.children) {
-					checkParseTree(parseTreeNode.children, parseTreeNode);
-				}
-			}
-		};
-	checkParseTree(parseTreeRoot);
-	return transcludes;
-};
-
-
-/*
-Return an array of tiddler titles that are transcluded from the specified tiddler
-*/
-exports.getTiddlerTranscludes = function(title) {
-	var self = this;
-	// We'll cache the transcludes so they only get computed if the tiddler changes
-	return this.getCacheForTiddler(title,"transcludes",function() {
-		// Parse the tiddler
-		var parser = self.parseTiddler(title);
-		if(parser) {
-			// this will ignore self-referential transclusions from `title`
-			return self.extractTranscludes(parser.tree, title);
-		}
-		return [];
-	});
-};
-
-/*
-Return an array of tiddler titles that transclude to the specified tiddler
-*/
-exports.getTiddlerBacktranscludes = function(targetTitle) {
-	var self = this,
-		backIndexer = this.getIndexer("BackIndexer"),
-		backtranscludes = backIndexer && backIndexer.subIndexers.transclude.lookup(targetTitle);
-
-	if(!backtranscludes) {
-		backtranscludes = [];
-	}
-	return backtranscludes;
-};
-
 /*
 Return a hashmap of tiddler titles that are referenced but not defined. Each value is the number of times the missing tiddler is referenced
 */