Remove gulp and related deps

package.json

@@ -15,34 +15,22 @@
     "@types/puppeteer": "^1.12.4",
     "@types/utf8": "^2.1.6",
     "@types/webpack": "^4.4.11",
-    "browserify": "^13.3.0",
     "chai": "3.5.0",
     "coveralls": "^3.0.1",
     "express": "4.13.4",
     "express-ws": "2.0.0-rc.1",
-    "fs-extra": "^1.0.0",
     "glob": "^7.0.5",
-    "gulp": "3.9.1",
-    "gulp-cli": "^1.2.2",
-    "gulp-concat": "^2.6.1",
-    "gulp-mocha": "^3.0.1",
-    "gulp-sourcemaps": "1.9.1",
-    "gulp-util": "3.0.8",
     "jsdom": "^11.11.0",
-    "merge-stream": "^1.0.1",
     "node-pty": "0.7.6",
     "nodemon": "1.10.2",
     "nyc": "^11.8.0",
     "puppeteer": "^1.15.0",
-    "sorcery": "^0.10.0",
     "source-map-loader": "^0.2.4",
     "ts-loader": "^4.5.0",
     "tslint": "^5.9.1",
     "tslint-consistent-codestyle": "^1.13.0",
     "typescript": "3.4",
     "utf8": "^3.0.0",
-    "vinyl-buffer": "^1.0.0",
-    "vinyl-source-stream": "^1.1.0",
     "webpack": "^4.17.1",
     "webpack-cli": "^3.1.0",
     "xterm-addon-attach": "0.1.0-beta8",
@@ -51,7 +39,7 @@
     "zmodem.js": "^0.1.5"
   },
   "scripts": {
-    "prepackage": "npm run prebuild",
+    "prepackage": "npm run build",
     "package": "webpack",
     "start": "node demo/start",
     "start-debug": "node --inspect-brk demo/start",
@@ -59,12 +47,11 @@
     "lint": "tslint 'src/**/*.ts' './demo/**/*.ts'",
     "test": "node ./bin/test.js",
     "posttest": "npm run lint",
-    "test-coverage": "nyc -x gulpfile.js -x '**/*test*' npm run mocha",
+    "test-coverage": "nyc -x '**/*test*' npm run mocha",
     "test-api": "mocha \"**/*.api.js\"",
-    "mocha": "gulp test",
     "prebuild": "tsc -b ./src/tsconfig.all.json",
-    "build": "gulp build",
-    "prepare": "npm run prebuild",
+    "build": "tsc -b ./src/tsconfig.all.json",
+    "prepare": "npm run build",
     "prepublishOnly": "npm run package",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "watch": "tsc -b -w ./src/tsconfig.all.json --preserveWatchOutput"