rollup.config.js

import babel from 'rollup-plugin-babel'

export default [{
    input: 'src/blockChain.js',
    output: {
        file: 'dist/blockChain.js',
        format: 'cjs'
    },
    plugins: [
        babel({
            "presets": [[
                "env",
                {
                    "modules": false,
                    "targets": {
                        "node": "current"
                      }
                }
            ],"stage-3"]
            
        })
    ]
},{
    input: 'src/test.js',
    output: {
        file: 'dist/test.js',
        format: 'cjs'
    },
    plugins: [
        babel({
            "presets": [[
                "env",
                {
                    "modules": false,
                    "targets": {
                        "node": "current"
                      }
                }
            ],"stage-3"]
        })
    ]
}]