.babelrc

{   
    "sourceMaps": "both",
    "presets": [
        ["@babel/env", {
            "useBuiltIns": "usage",
            "corejs": "^3.0.1"
        }]
        ,"@babel/typescript"
    ],
    "plugins": [
        ["@babel/plugin-proposal-class-properties"]
        ,["@babel/plugin-proposal-object-rest-spread"]
        ,["module-resolver", {
            "root": ["./src"]
            ,"extensions": [".js", ".ts"]
            ,"cwd": "packagejson"
        }]
    ]
    ,"env": {
        "test-src": {
            "plugins": [
                ["module-resolver", {
                    "root": ["./src", "./test"]
                    ,"extensions": [".js", ".ts"]
                }]
            ]
        }
        ,"test-compiled": {
            "plugins": [
                ["module-resolver", {
                    "root": ["./dist", "./test"]
                    ,"extensions": [".js"]
                    ,"cwd": "packagejson"
                }]
            ]
        }
    }
}