injected-javascript.ts

const injectedJavascript = [
  "setTimeout(function() {",
  "  const metaTag = document.createElement('meta');",
  "  metaTag.setAttribute('name', 'viewport');",
  "  metaTag.setAttribute('content', 'width=device-width, initial-scale=1');",
  "  document.getElementsByTagName('head')[0].appendChild(metaTag);",

  "  setTimeout(function() {",
  "    const documentSize = { displayedMessageContentHeight: document.body.scrollHeight };",
  "    const serializedDocumentSize = JSON.stringify(documentSize);",
  "    window.ReactNativeWebView.postMessage(serializedDocumentSize);",
  "  }, 50);",

  "}, 50);",
].join("")