我正在构建graphql api，但是我无法使用webpack构建单个文件，知道吗？
依赖项
"dependencies": {
"bcrypt": "^3.0.4",
"graphql-yoga": "^1.17.4",
"jsonwebtoken": "^8.5.0",
"nanoid": "^2.0.1",
"pg": "^7.8.2",
"ramda": "^0.26.1",
"typeorm": "^0.2.15-rc.2"
},
"devDependencies": {
"@babel/cli": "^7.4.3",
"@babel/core": "^7.3.4",
"@babel/node": "^7.2.2",
"@babel/plugin-proposal-class-properties": "^7.3.4",
"@babel/plugin-proposal-decorators": "^7.3.0",
"@babel/plugin-proposal-object-rest-spread": "^7.3.4",
"@babel/preset-env": "^7.3.4",
"babel-loader": "^8.0.5",
"jest": "^24.4.0",
"nodemon": "^1.18.10",
"webpack": "^4.29.6",
"webpack-cli": "^3.3.0"
}