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const testConfig = {  presets : [    [      '@babel/preset-env',      { targets : { node : 'current' } },    ],  ],}const options = {  "targets": {    "node": "10.6.0"  }}module.exports = function(api){  const isTest = api.env('test')  if (isTest) return testConfig
  return {    presets : [ ['@babel/preset-env', options] ],    plugins : [      '@babel/plugin-proposal-object-rest-spread',    ],  }}