remove externals in favor of npm packages

package-lock.json

@@ -3482,8 +3482,7 @@
     "@types/raf": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/@types/raf/-/raf-3.4.0.tgz",
-      "integrity": "sha512-taW5/WYqo36N7V39oYyHP9Ipfd5pNFvGTIQsNGj86xV88YQ7GnI30/yMfKDF7Zgin0m3e+ikX88FvImnK4RjGw==",
-      "optional": true
+      "integrity": "sha512-taW5/WYqo36N7V39oYyHP9Ipfd5pNFvGTIQsNGj86xV88YQ7GnI30/yMfKDF7Zgin0m3e+ikX88FvImnK4RjGw=="
     },
     "@types/range-parser": {
       "version": "1.2.3",
@@ -6075,7 +6074,6 @@
       "version": "3.0.6",
       "resolved": "https://registry.npmjs.org/canvg/-/canvg-3.0.6.tgz",
       "integrity": "sha512-eFUy8R/4DgocR93LF8lr+YUxW4PYblUe/Q1gz2osk/cI5n8AsYdassvln0D9QPhLXQ6Lx7l8hwtT8FLvOn2Ihg==",
-      "optional": true,
       "requires": {
         "@babel/runtime": "^7.6.3",
         "@types/raf": "^3.4.0",
@@ -17141,7 +17139,6 @@
       "version": "3.4.1",
       "resolved": "https://registry.npmjs.org/raf/-/raf-3.4.1.tgz",
       "integrity": "sha512-Sq4CW4QhwOHE8ucn6J34MqtZCeWFP2aQSmrlroYgqAV1PjStIhJXxYuTgUIfkEk7zTLjmIjLmU5q+fbD1NnOJA==",
-      "optional": true,
       "requires": {
         "performance-now": "^2.1.0"
       }
@@ -18052,8 +18049,7 @@
     "rgbcolor": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/rgbcolor/-/rgbcolor-1.0.1.tgz",
-      "integrity": "sha1-1lBezbMEplldom+ktDMHMGd1lF0=",
-      "optional": true
+      "integrity": "sha1-1lBezbMEplldom+ktDMHMGd1lF0="
     },
     "rimraf": {
       "version": "3.0.2",