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package。json

"browserslist": {

    "production": [

      ">0.2%",

      "not dead",

      "not op_mini all"

    ],

    "development": [

      "last 1 chrome version",

      "last 1 firefox version",

      "last 1 safari version"

    ]

  },

  "proxy": "http://localhost:5000"

}