add travis.yml, generate yarn.lock from existed node_modules

Author: mrdulin

.travis.yml

@@ -0,0 +1,19 @@
+language: node_js
+node_js:
+  - "10.16.0"
+before_install:
+  # install yarn
+  - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.17.3
+  - export PATH="$HOME/.yarn/bin:$PATH"
+install:
+  - yarn install
+jobs:
+  include:
+    - stage: "Tests"
+      name: "Unit Tests with coverage"
+      script: yarn coverage
+    - stage: "Compile"
+      script: yarn build
+stages:
+  - compile
+  - test

package.json

@@ -5,6 +5,7 @@
   "main": "./dist/index.js",
   "scripts": {
     "test": "jest --detectOpenHandles --verbose",
+    "coverage": "npm test -- --coverage",
     "clean": "rm -rf ./dist",
     "prebuild": "npm run clean",
     "build": "tsc",