{ "presets": [ [ "@babel/preset-env", { "modules": false, "targets": { "ie": "11" } } ] ], "plugins": [ "@babel/plugin-syntax-dynamic-import", "@babel/plugin-syntax-import-meta", "@babel/plugin-proposal-class-properties", "@babel/plugin-proposal-json-strings" ], "env": { "karma": { "plugins": ["babel-plugin-rewire"] }, "coverage": { "plugins": [ [ "babel-plugin-istanbul", { "exclude": ["spec/javascripts/**/*", "app/assets/javascripts/locale/**/app.js"] } ], "babel-plugin-rewire" ] } } }