From 26dfd3c110ced12f2bd374de391c2c05e24290d8 Mon Sep 17 00:00:00 2001
From: Marcos Casagrande <marcoscvp90@gmail.com>
Date: Sun, 26 Apr 2020 22:25:24 +0200
Subject: Add buffer size argument to copy (#4907)

---
 cli/js/io.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'cli/js/io.ts')

diff --git a/cli/js/io.ts b/cli/js/io.ts
index 50ea1216a..833d23874 100644
--- a/cli/js/io.ts
+++ b/cli/js/io.ts
@@ -70,9 +70,16 @@ export interface ReadWriteCloser extends Reader, Writer, Closer {}
 // https://golang.org/pkg/io/#ReadWriteSeeker
 export interface ReadWriteSeeker extends Reader, Writer, Seeker {}
 
-export async function copy(src: Reader, dst: Writer): Promise<number> {
+export async function copy(
+  src: Reader,
+  dst: Writer,
+  options?: {
+    bufSize?: number;
+  }
+): Promise<number> {
   let n = 0;
-  const b = new Uint8Array(DEFAULT_BUFFER_SIZE);
+  const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;
+  const b = new Uint8Array(bufSize);
   let gotEOF = false;
   while (gotEOF === false) {
     const result = await src.read(b);
-- 
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