remix-project/.babelrc

{
  "plugins": [["fast-async", {
                  "runtimePatten": null,
                  "compiler": {
                    "promises": true,
                    "es7": true,
                    "noRuntime": true,
                    "wrapAwait": true
                  }
                  }],
              "check-es2015-constants",
              "transform-es2015-arrow-functions",
              "transform-es2015-block-scoped-functions",
              "transform-es2015-block-scoping",
              "transform-es2015-classes",
              "transform-es2015-computed-properties",
              "transform-es2015-destructuring",
              "transform-es2015-duplicate-keys",
              "transform-es2015-for-of",
              "transform-es2015-function-name",
              "transform-es2015-literals",
              "transform-es2015-object-super",
              "transform-es2015-parameters",
              "transform-es2015-shorthand-properties",
              "transform-es2015-spread",
              "transform-es2015-sticky-regex",
              "transform-es2015-unicode-regex",
            ]
}