From e856bc029aaeac14de009db7e9cfd516e021be9a Mon Sep 17 00:00:00 2001
From: kingwl <kingwenlu@gmail.com>
Date: Thu, 14 May 2020 21:41:44 +0000
Subject: [PATCH] Cherry-pick PR #38525 into release-3.9

Component commits:
19624faea7 Fix build type error
---
 src/harness/vfsUtil.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/harness/vfsUtil.ts b/src/harness/vfsUtil.ts
index 76475b00360b2..88fc73ebca9be 100644
--- a/src/harness/vfsUtil.ts
+++ b/src/harness/vfsUtil.ts
@@ -649,14 +649,14 @@ namespace vfs {
          *
          * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
          */
-        public readFileSync(path: string, encoding: string): string;
+        public readFileSync(path: string, encoding: BufferEncoding): string;
         /**
          * Read from a file.
          *
          * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
          */
-        public readFileSync(path: string, encoding?: string | null): string | Buffer;
-        public readFileSync(path: string, encoding: string | null = null) { // eslint-disable-line no-null/no-null
+        public readFileSync(path: string, encoding?: BufferEncoding | null): string | Buffer;
+        public readFileSync(path: string, encoding: BufferEncoding | null = null) { // eslint-disable-line no-null/no-null
             const { node } = this._walk(this._resolve(path));
             if (!node) throw createIOError("ENOENT");
             if (isDirectory(node)) throw createIOError("EISDIR");