perf(bundle): improves bundle size

package.json

@@ -58,13 +58,13 @@
   },
   "homepage": "https://github.com/kulshekhar/ts-jest#readme",
   "dependencies": {
-    "bs-logger": "^0.2.3",
+    "bs-logger": "^0.2.5",
     "buffer-from": "^1.1.1",
     "fast-json-stable-stringify": "^2.0.0",
+    "json5": "^2.0.1",
     "make-error": "^1.3.5",
     "mkdirp": "^0.5.1",
     "semver": "^5.5.1",
-    "tslib": "^1.9.3",
     "yargs-parser": "^10.1.0"
   },
   "peerDependencies": {
@@ -98,7 +98,6 @@
     "husky": "^0.14.3",
     "jest": "^23.4.1",
     "js-yaml": "^3.12.0",
-    "json5": "^2.0.1",
     "lint-staged": "^7.2.2",
     "lodash.memoize": "^4.1.2",
     "lodash.merge": "^4.6.1",

tsconfig.build.json

@@ -1,9 +1,10 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
-    "sourceMap": true,
-    "inlineSources": true,
+    "sourceMap": false,
+    "inlineSources": false,
     "inlineSourceMap": false,
+    "removeComments": true,
     "outDir": "dist",
     "rootDir": "src",
   },

tsconfig.json

@@ -4,7 +4,7 @@
     "downlevelIteration": true,
     "esModuleInterop": true,
     "experimentalDecorators": true,
-    "importHelpers": true,
+    "importHelpers": false,
     "inlineSourceMap": true,
     "lib": [
       "es2015",