Rollup-plugin-typescript2: 0.20.0 版本中的“错误：入口模块不能是外部的”

export * from './index2';

// doesn't matter

import typescript from 'rollup-plugin-typescript2';

export default {
  input: './index.ts',
  output: {
    format: 'cjs',
    file: './dist/build.js',
  },
  plugins: [
    typescript()
  ]
}