Use tslib and importHelpers (#3559)

package.json

@@ -96,6 +96,7 @@
     "roboto-fontface": "^0.10.0",
     "round-slider": "^1.3.3",
     "superstruct": "^0.6.1",
+    "tslib": "^1.10.0",
     "unfetch": "^4.1.0",
     "web-animations-js": "^2.3.1",
     "xss": "^1.0.6"

tsconfig.json

@@ -15,6 +15,7 @@
     "noImplicitAny": false,
     "skipLibCheck": true,
     "resolveJsonModule": true,
-    "experimentalDecorators": true
+    "experimentalDecorators": true,
+    "importHelpers": true
   }
 }

yarn.lock

@@ -13210,7 +13210,7 @@ tslib@1.9.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.0.tgz#e37a86fda8cbbaf23a057f473c9f4dc64e5fc2e8"
   integrity sha512-f/qGG2tUkrISBlQZEjEqoZ3B2+npJjIf04H1wuAv9iA8i04Icp+61KRXxFdha22670NJopsZCIjhC3SnjPRKrQ==
 
-tslib@^1.7.1, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
+tslib@^1.10.0, tslib@^1.7.1, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
   version "1.10.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.10.0.tgz#c3c19f95973fb0a62973fb09d90d961ee43e5c8a"
   integrity sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==