Update: allow empty string toml config

packages/core/utils/src/config.js

@@ -82,7 +82,6 @@ export async function loadConfig(
       }
 
       let configContent = await fs.readFile(configFile, 'utf8');
-      if (!configContent) return null;
 
       let config;
       if (parse === false) {

packages/core/utils/test/config.test.js

@@ -0,0 +1,50 @@
+// @flow strict-local
+
+import assert from 'assert';
+import {loadConfig} from '../src/config';
+import {inputFS as fs} from '@parcel/test-utils';
+import path from 'path';
+
+describe('loadConfig', () => {
+  it('load config with json', async () => {
+    assert.deepEqual(
+      (
+        await loadConfig(
+          fs,
+          path.join(__dirname, './input/config/config.json'),
+          ['config.json'],
+          path.join(__dirname, './input/config/'),
+        )
+      )?.config,
+      {
+        hoge: 'fuga',
+      },
+    );
+  });
+
+  it('should throw error with empty string json', async () => {
+    // $FlowFixMe[prop-missing]
+    await assert.rejects(async () => {
+      await loadConfig(
+        fs,
+        path.join(__dirname, './input/config/empty.json'),
+        ['empty.json'],
+        path.join(__dirname, './input/config/'),
+      );
+    });
+  });
+
+  it('should load with empty string config toml', async () => {
+    assert.deepEqual(
+      (
+        await loadConfig(
+          fs,
+          path.join(__dirname, './input/config/empty.toml'),
+          ['empty.toml'],
+          path.join(__dirname, './input/config/'),
+        )
+      )?.config,
+      {},
+    );
+  });
+});

packages/core/utils/test/input/config/config.json

@@ -0,0 +1,3 @@
+{
+    "hoge": "fuga"
+}