1 files changed, 27 insertions, 0 deletions
diff --git a/cli/rt/21_dom_file.js b/cli/rt/21_dom_file.js
new file mode 100644
index 000000000..9d2f7fb6b
--- /dev/null
+++ b/cli/rt/21_dom_file.js
@@ -0,0 +1,27 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+((window) => {
+  const blob = window.__bootstrap.blob;
+
+  class DomFile extends blob.Blob {
+    constructor(
+      fileBits,
+      fileName,
+      options,
+    ) {
+      const { lastModified = Date.now(), ...blobPropertyBag } = options ?? {};
+      super(fileBits, blobPropertyBag);
+
+      // 4.1.2.1 Replace any "/" character (U+002F SOLIDUS)
+      // with a ":" (U + 003A COLON)
+      this.name = String(fileName).replace(/\u002F/g, "\u003A");
+      // 4.1.3.3 If lastModified is not provided, set lastModified to the current
+      // date and time represented in number of milliseconds since the Unix Epoch.
+      this.lastModified = lastModified;
+    }
+  }
+
+  window.__bootstrap.domFile = {
+    DomFile,
+  };
+})(this);