Add buffer size argument to copy (#4907)

1 files changed, 8 insertions, 1 deletions

diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index 387ea8326..8d20dfb3e 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -572,8 +572,15 @@ declare namespace Deno {
    *
    * @param src The source to copy from
    * @param dst The destination to copy to
+   * @param options Can be used to tune size of the buffer. Default size is 32kB
    */
-  export function copy(src: Reader, dst: Writer): Promise<number>;
+  export function copy(
+    src: Reader,
+    dst: Writer,
+    options?: {
+      bufSize?: number;
+    }
+  ): Promise<number>;
 
   /** Turns a Reader, `r`, into an async iterator.
    *