Optimization: Reuse ArrayBuffer during serialization.

1 files changed, 5 insertions, 5 deletions

diff --git a/js/files.ts b/js/files.ts
index ae36c7a82..33918302c 100644
--- a/js/files.ts
+++ b/js/files.ts
@@ -4,7 +4,7 @@ import { Reader, Writer, Closer, ReadResult } from "./io";
 import * as dispatch from "./dispatch";
 import * as msg from "gen/msg_generated";
 import { assert } from "./util";
-import { flatbuffers } from "flatbuffers";
+import * as flatbuffers from "./flatbuffers";
 
 /** The Deno abstraction for reading and writing files. */
 export class File implements Reader, Writer, Closer {
@@ -51,7 +51,7 @@ export async function open(
   filename: string,
   mode: OpenMode = "r"
 ): Promise<File> {
-  const builder = new flatbuffers.Builder();
+  const builder = flatbuffers.createBuilder();
   const filename_ = builder.createString(filename);
   msg.Open.startOpen(builder);
   msg.Open.addFilename(builder, filename_);
@@ -73,7 +73,7 @@ export async function read(
   rid: number,
   p: ArrayBufferView
 ): Promise<ReadResult> {
-  const builder = new flatbuffers.Builder();
+  const builder = flatbuffers.createBuilder();
   msg.Read.startRead(builder);
   msg.Read.addRid(builder, rid);
   const inner = msg.Read.endRead(builder);
@@ -90,7 +90,7 @@ export async function read(
  * Resolves with the number of bytes written.
  */
 export async function write(rid: number, p: ArrayBufferView): Promise<number> {
-  const builder = new flatbuffers.Builder();
+  const builder = flatbuffers.createBuilder();
   msg.Write.startWrite(builder);
   msg.Write.addRid(builder, rid);
   const inner = msg.Write.endWrite(builder);
@@ -104,7 +104,7 @@ export async function write(rid: number, p: ArrayBufferView): Promise<number> {
 
 /** Close the file ID. */
 export function close(rid: number): void {
-  const builder = new flatbuffers.Builder();
+  const builder = flatbuffers.createBuilder();
   msg.Close.startClose(builder);
   msg.Close.addRid(builder, rid);
   const inner = msg.Close.endClose(builder);