Add rollup to dev deps

package-lock.json

@@ -153,6 +153,12 @@
         "tslib": "^1.9.3"
       }
     },
+    "@types/estree": {
+      "version": "0.0.39",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
+      "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
+      "dev": true
+    },
     "@types/mocha": {
       "version": "5.2.5",
       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.5.tgz",
@@ -164,6 +170,12 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-10.12.18.tgz",
       "integrity": "sha512-fh+pAqt4xRzPfqA6eh3Z2y6fyZavRIumvjhaCL753+TVkGKGhpPeyrJG2JftD0T9q4GF00KjefsQ+PQNDdWQaQ=="
     },
+    "acorn": {
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.5.tgz",
+      "integrity": "sha512-i33Zgp3XWtmZBMNvCr4azvOFeWVw1Rk6p3hfi3LUDvIFraOMywb1kAtrbi+med14m4Xfpqm3zRZMT+c0FNE7kg==",
+      "dev": true
+    },
     "ajv": {
       "version": "6.7.0",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.7.0.tgz",
@@ -2300,6 +2312,17 @@
         "path-parse": "^1.0.6"
       }
     },
+    "rollup": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.1.2.tgz",
+      "integrity": "sha512-OkdMxqMl8pWoQc5D8y1cIinYQPPLV8ZkfLgCzL6SytXeNA2P7UHynEQXI9tYxuAjAMsSyvRaWnyJDLHMxq0XAg==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.39",
+        "@types/node": "*",
+        "acorn": "^6.0.5"
+      }
+    },
     "rollup-plugin-typescript": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/rollup-plugin-typescript/-/rollup-plugin-typescript-1.0.0.tgz",

package.json

@@ -42,6 +42,7 @@
     "coveralls": "^3.0.2",
     "mocha": "^5.2.0",
     "nyc": "^13.1.0",
+    "rollup": "^1.1.2",
     "rollup-plugin-typescript": "^1.0.0",
     "ts-node": "^7.0.1",
     "typescript": "^3.1.6"