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