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{ "presets": [ ["latest", { "es2015": { "modules": false } }], "stage-2" ], "env": { "coverage": { "plugins": [ ["istanbul", { "exclude": [ "app/assets/javascripts/droplab/**/*", "spec/javascripts/**/*" ] }], ["transform-define", { "process.env.BABEL_ENV": "coverage" }] ] } } }