# 一、自动升级
npx babel-upgrade --write --install
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# 二、手动升级
# 2.1 安装依赖
// Babel-loader 8.x
"babel-loader"
// Babel-core 7.x
"@babel/core"
// Env
"@babel/preset-env"
// Runtime
"@babel/runtime"
"@babel/plugin-transform-runtime"
// React
"@babel/preset-react"
// Stage 0
"@babel/plugin-proposal-function-bind"
// Stage 1
"@babel/plugin-proposal-export-default-from"
"@babel/plugin-proposal-logical-assignment-operators"
"@babel/plugin-proposal-optional-chaining"
"@babel/plugin-proposal-pipeline-operator"
"@babel/plugin-proposal-nullish-coalescing-operator"
"@babel/plugin-proposal-do-expressions"
// Stage 2
"@babel/plugin-proposal-decorators"
"@babel/plugin-proposal-function-sent"
"@babel/plugin-proposal-export-namespace-from"
"@babel/plugin-proposal-numeric-separator"
"@babel/plugin-proposal-throw-expressions"
// Stage 3
"@babel/plugin-syntax-dynamic-import"
"@babel/plugin-syntax-import-meta"
"@babel/plugin-proposal-class-properties"
"@babel/plugin-proposal-json-strings"
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# 2.2 修改.babelrc
{
"presets": [
["@babel/preset-env", {
"targets": {
"browsers": [
"last 2 versions",
"Firefox ESR",
"> 1%",
"ie >= 9",
"iOS >= 8",
"Android >= 4"
]
}
}], "@babel/preset-react"
],
"plugins": [
"@babel/plugin-transform-runtime",
"@babel/plugin-proposal-function-bind",
"@babel/plugin-proposal-export-default-from",
