Electron-builderがERROR in unknown: Unexpected tokenを出して失敗する。

前提・実現したいこと

create-Electron-Reactによって生成された物からJavaScript、React、Electronでソフトウェアを開発しています。
Electron-builderを使ってビルドしようとしました。

発生している問題・エラーメッセージ

ERROR  failed to build main process
ERROR in unknown: Unexpected token (172:63)

debug.log
10 info it worked if it ends with ok
21 verbose cli [
31 verbose cli   'C:\Program Files\nodejs\node.exe',
41 verbose cli   'C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js',
51 verbose cli   'run',
61 verbose cli   'build'
71 verbose cli ]
82 info using npm@6.14.15
93 info using node@v14.18.0
104 verbose run-script [ 'prebuild', 'build', 'postbuild' ]
115 info lifecycle aaa@0.0.1~prebuild: aaa@0.0.1
126 info lifecycle aaa@0.0.1~build: aaa@0.0.1
137 verbose lifecycle aaa@0.0.1~build: unsafe-perm in lifecycle true
148 verbose lifecycle aaa@0.0.1~build: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;H:\program\aaa\node_modules.bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\dotnet\;C:\Program Files\Git\cmd;C:\Program Files\nodejs\;C:\Users\bbb.cargo\bin;C:\Users\bbb\AppData\Local\Microsoft\WindowsApps;C:\Users\bbb\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\bbb.dotnet\tools;H:\MyCommand;C:\eclipse\eclipse4.8 (java)\java\10\bin;C:\Users\bbb\AppData\Roaming\npm
159 verbose lifecycle aaa@0.0.1~build: CWD: H:\program\aaa
1610 silly lifecycle aaa@0.0.1~build: Args: [ '/d /s /c', 'node .electron-react/build.js && electron-builder' ]
1711 silly lifecycle aaa@0.0.1~build: Returned: code: 1  signal: null
1812 info lifecycle aaa@0.0.1~build: Failed to exec build script
1913 verbose stack Error: aaa@0.0.1 build: `node .electron-react/build.js && electron-builder`
2013 verbose stack Exit status 1
2113 verbose stack     at EventEmitter.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:332:16)
2213 verbose stack     at EventEmitter.emit (events.js:400:28)
2313 verbose stack     at ChildProcess.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
2413 verbose stack     at ChildProcess.emit (events.js:400:28)
2513 verbose stack     at maybeClose (internal/child_process.js:1058:16)
2613 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:293:5)
2714 verbose pkgid aaa@0.0.1
2815 verbose cwd H:\program\aaa
2916 verbose Windows_NT 10.0.19041
3017 verbose argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "run" "build"
3118 verbose node v14.18.0
3219 verbose npm  v6.14.15
3320 error code ELIFECYCLE
3421 error errno 1
3522 error aaa@0.0.1 build: `node .electron-react/build.js && electron-builder`
3622 error Exit status 1
3723 error Failed at the aaa@0.0.1 build script.
3823 error This is probably not a problem with npm. There is likely additional logging output above.
3924 verbose exit [ 1, true ]
40

該当のソースコード

index.rs
1'use strict'
2
3import { app, BrowserWindow, ipcMain } from 'electron'
4import ElectronStore from 'electron-store'
5
6if (process.env.NODE_ENV !== 'development') {
7  global.__static = require('path').join(__dirname, '/static').replace(/\/g, '\\')
8}
9
10let mainWindow
11const winURL = process.env.NODE_ENV === 'development'
12  ? 'http://localhost:9080'
13  : `file://${__dirname}/index.html`
14
15function createWindow () {
16  /**
17   * Initial window options
18   */
19  mainWindow = new BrowserWindow({
20    height: 563,
21    useContentSize: true,
22    width: 1000,
23    resizable: false,
24    webPreferences: {
25      nodeIntegration: true
26    }
27  })
28
29  mainWindow.setMenu(null)
30  mainWindow.loadURL(winURL)
31
32  mainWindow.on('closed', () => {
33    mainWindow = null
34  })
35}
36
37app.on('ready', createWindow)
38
39app.on('window-all-closed', () => {
40  if (process.platform !== 'darwin') {
41    app.quit()
42  }
43})
44
45app.on('activate', () => {
46  if (mainWindow === null) {
47    createWindow()
48  }
49})
50
51const store = new ElectronStore()
52
53ipcMain.handle('getStoreValue', (event, key) => {
54  return store.get(key)
55})
56
57ipcMain.handle('setStoreValue', (event, key, value) => {
58  store.set(key, value)
59})
60
61ipcMain.handle('hasStoreValue', (event, key) => {
62  return store.has(key)
63})