message: refactored resolveHtmlPath
diff: -/* eslint import/prefer-default-export: off, import/no-mutable-exports: off */
  +/* eslint import/prefer-default-export: off */
  import { URL } from 'url';
  import path from 'path';
  -export let resolveHtmlPath: (htmlFileName: string) => string;
  -
  +export function resolveHtmlPath(htmlFileName: string) {
  if (process.env.NODE_ENV === 'development') {
  const port = process.env.PORT || 1212;
  - resolveHtmlPath = (htmlFileName: string) => {
  const url = new URL(`http://localhost:${port}`);
  url.pathname = htmlFileName;
  return url.href;
  - };
  -} else {
  - resolveHtmlPath = (htmlFileName: string) => {
  + }
  return `file://${path.resolve(__dirname, '../renderer/', htmlFileName)}`;
  - };
  }
  