matt-tools/babel.config.json

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{
    "presets": [
      ["@babel/preset-env", {
        "targets": "> 0.25%, not dead"
      }]
    ],
    "plugins": [
      // 不污染全局，在运行时加载
      ["@babel/plugin-transform-runtime", {
        "corejs": 3
      }]
    ]
  }