Electron contextBridge is undefined after packing with electron-builder

All is well in the development, the console prints contextBridge normally
enter image description here

After packing into a desktop application using electron-builder, the console prints contextBridge undefined
enter image description here

I try to console electron object in preload.js, it contains contextBridge in development but there is no contextBridge in package application, did I make a mistake when packing?

main.js

const {app, BrowserWindow, Menu, MenuItem, ipcMain} = require('electron');
const path = require("path");

const low = require('lowdb');
const FileSync = require('lowdb/adapters/FileSync');
const adapter = new FileSync('./FSconfig.json', {
    serialize: (data) => JSON.stringify(data),
    deserialize: (data) => JSON.parse(data)
})
const db = low(adapter);

let win;
let windowConfig = {
    icon: './img/icon.png',
    width: 1000,
    height: 800,
    webPreferences: {
        contextIsolation: true,
        nodeIntegration: false,
        preload: path.join(__dirname, 'preload.js')
    }
};

function createWindow() {
    win = new BrowserWindow(windowConfig);
    win.loadURL(`${__dirname}/index.html`);
    win.on('close', () => {
        win = null;
    });
    win.on('resize', () => {
        win.reload();
    })
}

ipcMain.on('modifyJson', (event, args) => {
    for (let item in args) {
        if (args.hasOwnProperty(item)) {
            db.set(item, args[item]).write()
        }
    }
})


app.on('ready', createWindow);
app.on('window-all-closed', () => {
    app.quit();
});
app.on('activate', () => {
    if (win == null) {
        createWindow();
    }
});

preload.js

const {contextBridge, ipcRenderer} = require('electron');

cconsole.log(contextBridge, 'contextBridge');
console.log(ipcRenderer, 'ipcRenderer');

contextBridge.exposeInMainWorld('modify', {
    write: (modifyValue) => ipcRenderer.send('modifyJson', modifyValue)
})

package.json

{
    "name": "appelectron",
    "version": "1.0.0",
    "description": "a Application",
    "main": "main.js",
    "scripts": {
        "start": "electron .",
        "pack": "electron-builder --win --x64",
        "dist": "electron-builder",
        "postinstall": "install-app-deps"
    },
    "author": "",
    "license": "ISC",
    "devDependencies": {
        "electron": "^16.0.7",
        "electron-builder": "^22.14.5"
    },
    "build": {
        "appId": "修改配置",
        "copyright": "Copyright © 2021-forever zjing",
        "artifactName": "修改配置-${version}-${arch}.${ext}",
        "win": {
            "requestedExecutionLevel": "highestAvailable",
            "target": [
                {
                    "target": "nsis",
                    "arch": [
                        "x64"
                    ]
                }
            ]
        },
        "electronVersion": "1.0.0",
        "nsis": {
            "oneClick": false,
            "allowToChangeInstallationDirectory": true,
            "createDesktopShortcut": true,
            "artifactName": "修改配置-${version}-${arch}.${ext}"
        },
        "extraResources": [
            {
                "from": "./static/img/",
                "to": "app-server",
                "filter": [
                    "**/*"
                ]
            },
            {
                "from": "./FSconfig.json",
                "to": "../FSconfig.json"
            }
        ]
    },
    "dependencies": {
        "lowdb": "^1.0.0"
    }
}