How to include both import and require statements in the bundle using rollup

When I use only const Example1 = require('./example1.js) statement then code inside example1.js file is getting included in the bundle. And if I use only import Example2 from './example2.js' then also code inside example2.js is getting included in the bundle. But if I use both the statements only import is working and require is not working.

I am using rollup for bundling.

My rollup configuration looks like this

import babel from 'rollup-plugin-babel'
import commonjs from 'rollup-plugin-commonjs'
import external from 'rollup-plugin-peer-deps-external'
import postcss from 'rollup-plugin-postcss'
import resolve from 'rollup-plugin-node-resolve'
import url from 'rollup-plugin-url'
import svg from 'rollup-plugin-svg'
import json from 'rollup-plugin-json';
import { terser } from 'rollup-plugin-terser'

export default {
  input: 'src/sdk/test.js',
  output: [
    {
      file: "src/sdk/sdk.js",
      format: 'cjs'
    },
    {
      file: "src/sdk/sdk.es.js",
      format: 'es'
    },
    {
      file: "src/sdk/sdk.iife.js",
      format: 'iife'
    }
  ],
  plugins: [
    resolve({
      browser: true,
    }),
    commonjs(),
    external(),
    postcss({
      modules: true
    }),
    url({
      limit: 100 * 1024,
      emitFiles: false
    }),
    svg(),
    babel({
      exclude: 'node_modules/**',
      "plugins": ["@babel/plugin-proposal-class-properties"]
    }),
    terser(),
    json()
  ]
}