feat: migration to typescript

Author: @jotadeveloper

core/streams/.babelrc

@@ -1,14 +1,3 @@
 {
-  "presets": [["env", {
-    "targets": {
-      "node": "6"
-    }
-  }], "flow"],
-  "env": {
-    "test": {
-      "plugins": [
-        "transform-async-to-generator"
-      ]
-    }
-  }
+  "presets": [["@verdaccio", {"typescript": true}]]
 }

core/streams/.circleci/config.yml

@@ -0,0 +1,60 @@
+version: 2
+jobs:
+  lint:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - checkout
+      - run: yarn install --no-progress --registry https://registry.verdaccio.org --no-lockfile
+      - run: yarn lint
+      - run: yarn build
+
+  test_11:
+    docker:
+      - image: circleci/node:11
+    steps:
+      - checkout
+      - run: yarn install --no-progress
+      - run: yarn test
+
+  test_10:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - checkout
+      - run: yarn install --no-progress
+      - run: yarn test
+
+  test_8:
+    docker:
+      - image: circleci/node:8
+    steps:
+      - checkout
+      - run: yarn install --no-progress
+      - run: yarn test
+
+  test_9:
+    docker:
+      - image: circleci/node:9
+    steps:
+      - checkout
+      - run: yarn install --no-progress
+      - run: yarn test
+
+workflows:
+  version: 2
+  build_and_test:
+    jobs:
+      - lint
+      - test_11:
+          requires:
+            - lint
+      - test_10:
+          requires:
+            - lint
+      - test_8:
+          requires:
+            - lint
+      - test_9:
+          requires:
+            - lint

core/streams/.flowconfig

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2017 Verdaccio Team
+Copyright (c) 2019 Verdaccio Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal