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{
"presets": [
[
"@babel/preset-env",
"targets": {
"edge": "17",
"firefox": "60",
"chrome": "67",
"safari": "11.1"
},
"corejs": "2.0",
"useBuiltIns": "usage" // @babel/polyfill 配置：usage 按需加载 ECMAscript 规范库
}
]