From ccee2f01ba2f6304720ab17e99dee17bf6687bd8 Mon Sep 17 00:00:00 2001
From: "Kevin (Kun) \"Kassimo\" Qian" <kevinkassimo@gmail.com>
Date: Tue, 6 Aug 2019 06:22:11 -0700
Subject: Implement Blob url support for worker (#2729)

---
 js/blob.ts | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'js/blob.ts')

diff --git a/js/blob.ts b/js/blob.ts
index f2668b642..94d03c97f 100644
--- a/js/blob.ts
+++ b/js/blob.ts
@@ -118,6 +118,10 @@ function processBlobParts(
   return bytes;
 }
 
+// A WeakMap holding blob to byte array mapping.
+// Ensures it does not impact garbage collection.
+export const blobBytesWeakMap = new WeakMap<domTypes.Blob, Uint8Array>();
+
 export class DenoBlob implements domTypes.Blob {
   private readonly [bytesSymbol]: Uint8Array;
   readonly size: number = 0;
@@ -161,6 +165,9 @@ export class DenoBlob implements domTypes.Blob {
     this[bytesSymbol] = bytes;
     this.size = bytes.byteLength;
     this.type = type;
+
+    // Register bytes for internal private use.
+    blobBytesWeakMap.set(this, bytes);
   }
 
   slice(start?: number, end?: number, contentType?: string): DenoBlob {
-- 
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