ci(travis-ci): build stages

Author: chimurai

.travis.yml

@@ -1,11 +1,24 @@
+sudo: false
 language: node_js
-cache: yarn
 node_js:
 - 'stable'
 - '10'
 - '8'
 - '6'
-after_success: yarn coveralls
+before_install:
+  - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.15.2
+  - export PATH=$HOME/.yarn/bin:$PATH
+cache: yarn
+stages:
+  - lint
+  - test
+  - coveralls
+jobs:
+  include:
+    - stage: lint
+      script: yarn lint
+    - stage: coveralls
+      script: yarn coveralls
 env:
   global:
     # COVERALLS_REPO_TOKEN=

package.json

@@ -12,7 +12,6 @@
     "lint:prettier": "prettier --check \"**/*.{js,ts,md}\"",
     "lint:tslint": "yarn tslint -c tslint.json '{lib,test}/**/*.ts'",
     "lint:fix": "prettier --write \"**/*.{js,ts,md}\"",
-    "prebuild": "yarn lint",
     "build": "tsc",
     "pretest": "yarn build",
     "test": "jest --runInBand",