index.js
function injectSWRegister(data) {
  let swHtml = `<script>${compiledSWRegTpl}</script></body>`;

  if (data.indexOf(compiledSWRegTpl) === -1) {
    data = data.replace('</body>', swHtml);
  }

  return data;
}
function injectSWRegister(data) {
  let swHtml = `<script>${compiledSWRegTpl}</script></body>`;

  if (data.indexOf(compiledSWRegTpl) === -1) {
    data = data.replace('</body>', swHtml);
  }

  return data;
}
function injectSWRegister ( data ) { let swHtml = ` ${ compiledSWRegTpl } ` ; if ( data . indexOf ( compiledSWRegTpl ) === - 1 ) { data = data . replace ( '</body>' , swHtml ) ; } return data ; }
inject service worker registion fragment into page code

@param {string} data html
@return {string}
inject service worker registion fragment into page code