chore(TypeScript): remove mock-fs

package.json

@@ -58,7 +58,6 @@
     "express": "^4.16.4",
     "jsdom": "^13.2.0",
     "mocha": "^5.2.0",
-    "mock-fs": "^4.7.0",
     "nyc": "^13.1.0",
     "regenerator-runtime": "^0.12.1",
     "rollup": "^1.1.2",
@@ -68,7 +67,6 @@
     "semantic-release": "^15.13.3",
     "sinon": "^7.2.3",
     "sinon-chai": "^3.3.0",
-    "source-map-support": "^0.5.10",
     "supertest": "^3.4.2",
     "ts-node": "^8.0.2",
     "tsconfig-paths": "^3.8.0",