1 files changed, 9 insertions, 1 deletions
diff --git a/runtime/js/40_files.js b/runtime/js/40_files.js
index 2ce495f8e..d552b4ba5 100644
--- a/runtime/js/40_files.js
+++ b/runtime/js/40_files.js
@@ -4,7 +4,7 @@
 ((window) => {
   const core = window.Deno.core;
   const { read, readSync, write, writeSync } = window.__bootstrap.io;
-  const { fstat, fstatSync } = window.__bootstrap.fs;
+  const { ftruncate, ftruncateSync, fstat, fstatSync } = window.__bootstrap.fs;
   const { pathFromURL } = window.__bootstrap.util;
 
   function seekSync(
@@ -88,6 +88,14 @@
       return writeSync(this.rid, p);
     }
 
+    truncate(len) {
+      return ftruncate(this.rid, len);
+    }
+
+    truncateSync(len) {
+      return ftruncateSync(this.rid, len);
+    }
+
     read(p) {
       return read(this.rid, p);
     }