fix(dependencies): include TypeScript as a direct dependency (for now?)

Author: jrolfs

package.json

@@ -91,6 +91,7 @@
     "rollup-plugin-size-snapshot": "^0.9.0",
     "rollup-plugin-terser": "^5.1.1",
     "semver": "^6.2.0",
+    "typescript": "^3.5.3",
     "which": "^1.3.0",
     "yargs-parser": "^13.1.1"
   },

yarn.lock

@@ -7543,6 +7543,11 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+typescript@^3.5.3:
+  version "3.5.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.5.3.tgz#c830f657f93f1ea846819e929092f5fe5983e977"
+  integrity sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==
+
 uglify-js@^3.1.4:
   version "3.6.0"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.6.0.tgz#704681345c53a8b2079fb6cec294b05ead242ff5"