.babelrc

{
	"plugins": [
		"@babel/plugin-transform-async-to-generator",
		"@babel/plugin-proposal-class-properties"
	],
	"presets": [
		[
			"@babel/preset-env",
			{
				"useBuiltIns": "usage",
				"corejs": "3",
				"targets": {
					"browsers": ["last 5 versions", "ie >= 8"]
				}
			}
		]
	]
}