babel7对decorators的支持

不再使用6代的babel-plugin-transform-decorators-legacy。使用新的@babel/plugin-proposal-decorators

{
    "plugins": [
        "@babel/plugin-transform-react-jsx",
        [
            "@babel/plugin-proposal-decorators",
            {
                "legacy": true
            }
        ],
        [
            "@babel/plugin-proposal-class-properties",
            {
                "loose": true
            }
        ]
    ]
}

对es6语法的支持

"presets": [
        [
            "@babel/preset-env",
            {
                "modules": false,
                "targets": {
                    "browsers": [
                        "> 1%",
                        "last 2 versions",
                        "not ie <= 8"
                    ]
                },
                "useBuiltIns": "usage"
            }
        ]
    ]