Add tsconfig lib for padStart

Author: dolfbarr

tsconfig.json

@@ -10,7 +10,12 @@
     // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
     /* Language and Environment */
     "target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
-    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+    "lib": [
+      "ES2015",
+      "ES2016",
+      "ES2017",
+      "DOM"
+    ], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
     "jsx": "react", /* Specify what JSX code is generated. */
     // "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */
     // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */