add optional chaining

package.json

@@ -16,7 +16,7 @@
     "build": "npm run build-cjs && npm run build-es6 && npm run build-types && rimraf umd && npm run build-umd && npm run build-min",
     "build-types": "tsc --emitDeclarationOnly",
     "build-cjs": "rimraf lib && babel ./src -d lib --extensions \".ts,.tsx\"",
-    "build-es6": "rimraf es6 && babel ./src -d es6 --blacklist=es6.modules --extensions \".ts,.tsx\"",
+    "build-es6": "rimraf es6 && babel ./src -d es6 --extensions \".ts,.tsx\"",
     "build-umd": "NODE_ENV=development webpack src/LoadingOverlay.tsx -o umd/index.js",
     "build-min": "NODE_ENV=production webpack src/LoadingOverlay.tsx -o umd/index.min.js",
     "storybook": "start-storybook -p 9001",
@@ -49,7 +49,7 @@
     "@babel/plugin-syntax-class-properties": "^7.1.0",
     "@babel/preset-env": "^7.1.0",
     "@babel/preset-react": "^7.0.0",
-    "@babel/preset-typescript": "^7.7.7",
+    "@babel/preset-typescript": "^7.12.7",
     "@emotion/core": "^10.0.27",
     "@storybook/addon-actions": "^5.2.8",
     "@storybook/preset-typescript": "^1.2.0",
@@ -69,15 +69,15 @@
     "jest": "24.9.0",
     "react": "^16.6.3",
     "react-addons-test-utils": "^15.6.2",
-    "react-docgen-typescript-loader": "^3.6.0",
+    "react-docgen-typescript-loader": "^3.7.2",
     "react-dom": "^16.6.3",
     "react-testing-library": "^5.3.1",
     "regenerator-runtime": "^0.13.1",
     "rimraf": "^2.6.2",
     "standard": "^12.0.1",
     "styled-components": "^4.1.2",
     "ts-jest": "^24.2.0",
-    "ts-loader": "^6.2.1",
+    "ts-loader": "^8.0.11",
     "typescript": "^3.7.4",
     "webpack": "^4.26.1",
     "webpack-cli": "^3.1.2"

src/LoadingOverlay.tsx

@@ -33,7 +33,7 @@ class LoadingOverlayWrapper extends PureComponent<LoadingOverLayProps, LoadingOv
 
   componentDidUpdate (prevProps: LoadingOverLayProps) {
     const { active } = this.props
-    if (active && this.wrapper && this.wrapper.current) this.wrapper.current.scrollTop = 0
+    if (active && this.wrapper?.current) this.wrapper.current.scrollTop = 0
   }
 
   /**