diff --git a/javascript/extractor/src/com/semmle/js/extractor/OffsetTranslationBuilder.java b/javascript/extractor/src/com/semmle/js/extractor/OffsetTranslationBuilder.java
deleted file mode 100644
index 3f417eb7b15..00000000000
--- a/javascript/extractor/src/com/semmle/js/extractor/OffsetTranslationBuilder.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package com.semmle.js.extractor;
-
-import com.semmle.util.data.IntList;
-
-/**
- * A mapping from integers to integers, is encoded as a sequence of consecutive intervals and their
- * corresponding output intervals.
- */
-public class OffsetTranslationBuilder {
-  private IntList anchors = IntList.create();
-  private IntList deltas = IntList.create();
-
-  /** Returns the mapping of x. */
-  public int get(int x) {
-    int index = anchors.binarySearch(x);
-    if (index < 0) {
-      // The insertion point is -index - 1.
-      // Get the index immediately before that.
-      index = -index - 2;
-      if (index < 0) {
-        // If queried before the first anchor, use the first anchor anyway.
-        index = 0;
-      }
-    }
-    return x + deltas.get(index);
-  }
-
-  /**
-   * Maps the given input offset to the given output offset.
-   *
-   * <p>This is added as an anchor. Any offset is mapped based on its closest preceding anchor.
-   */
-  public void set(int from, int to) {
-    anchors.add(from);
-    deltas.add(to - from);
-  }
-}