From b02296a619967b0c4bd8e1bdfa5cae3b367b726d Mon Sep 17 00:00:00 2001
From: Ulf Nilsson <kaksmet@gmail.com>
Date: Tue, 2 Jul 2019 07:10:25 +0000
Subject: [PATCH] Use async readFile in getRollupDefaultPlugin (#2965)

---
 browser/fs.ts              | 2 +-
 src/utils/defaultPlugin.ts | 4 ++--
 src/utils/fs.ts            | 5 +++++
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/browser/fs.ts b/browser/fs.ts
index 91f9356c180..5cc22ebd873 100644
--- a/browser/fs.ts
+++ b/browser/fs.ts
@@ -4,6 +4,6 @@ const nope = (method: string) => (..._args: any[]): any => {
 
 export const lstatSync = nope('lstatSync');
 export const readdirSync = nope('readdirSync');
-export const readFileSync = nope('readFileSync');
+export const readFile = nope('readFile');
 export const realpathSync = nope('realpathSync');
 export const writeFile = nope('writeFile');
diff --git a/src/utils/defaultPlugin.ts b/src/utils/defaultPlugin.ts
index 939da211047..4b27c4c1546 100644
--- a/src/utils/defaultPlugin.ts
+++ b/src/utils/defaultPlugin.ts
@@ -1,6 +1,6 @@
 import { Plugin, ResolveIdHook } from '../rollup/types';
 import { error } from './error';
-import { lstatSync, readdirSync, readFileSync, realpathSync } from './fs';
+import { lstatSync, readdirSync, readFile, realpathSync } from './fs';
 import { basename, dirname, isAbsolute, resolve } from './path';
 
 export function getRollupDefaultPlugin(preserveSymlinks: boolean): Plugin {
@@ -8,7 +8,7 @@ export function getRollupDefaultPlugin(preserveSymlinks: boolean): Plugin {
 		name: 'Rollup Core',
 		resolveId: createResolveId(preserveSymlinks) as ResolveIdHook,
 		load(id) {
-			return readFileSync(id, 'utf-8');
+			return readFile(id);
 		},
 		resolveFileUrl({ relativePath, format }) {
 			return relativeUrlMechanisms[format](relativePath);
diff --git a/src/utils/fs.ts b/src/utils/fs.ts
index 5afe9465d88..f7550e5cad0 100644
--- a/src/utils/fs.ts
+++ b/src/utils/fs.ts
@@ -3,6 +3,11 @@ import { dirname } from './path';
 
 export * from 'fs';
 
+export const readFile = (file: string) =>
+	new Promise<string>((fulfil, reject) =>
+		fs.readFile(file, 'utf-8', (err, contents) => (err ? reject(err) : fulfil(contents)))
+	);
+
 function mkdirpath(path: string) {
 	const dir = dirname(path);
 	try {