text: const json = require('rollup-plugin-json');
  const buble = require('rollup-plugin-buble');
  const gulpConfig = require('./gulp.config.js');
  const nodeResolve = require('rollup-plugin-node-resolve');
  const commonjs = require('rollup-plugin-commonjs');
  const replace = require('rollup-plugin-replace');
  
  const onwarn = warning => {
    // Silence circular dependency warning for moment
    if (warning.code === 'CIRCULAR_DEPENDENCY' && warning.importer.indexOf('node_modules/d3') !== -1) {
      return;
    }
    if (warning.code === 'THIS_IS_UNDEFINED' && !warning.importer) {
      return;
    }
    console.warn(`${warning.message}`);
  };
  
  class RollupConfig {
    constructor() {
      this.input = `${gulpConfig.libScripts}/index.js`;
      this.onwarn = onwarn;
      this.plugins = [
        json(),
        buble({
          exclude: ['node_modules/**', '*.json']
        }),
        replace({
          S3_BUCKET: JSON.stringify(process.env.S3_CHARTTOOL_BUCKET)
        }),
        nodeResolve({ jsnext: true }),
        commonjs()
      ];
    }
  }
  
  module.exports = RollupConfig;
  