Use Azure Pipelines instead of Travis and AppVeyor

azure-pipelines.yml

@@ -0,0 +1,39 @@
+trigger:
+  - master
+
+jobs:
+  - job: Lint
+    displayName: Lint on Linux Node v10
+    pool:
+      vmImage: "Ubuntu 16.04"
+    variables:
+      NODE_VERSION: 10
+    steps:
+      - template: azure-pipelines/jobs/lint.yml
+
+  - job: Test_Windows
+    displayName: Test on Windows Node v10
+    pool:
+      vmImage: vs2017-win2016
+    variables:
+      NODE_VERSION: 10
+    steps:
+      - template: azure-pipelines/jobs/test.yml
+
+  - job: Test_macOS
+    displayName: Test on macOS Node v10
+    pool:
+      vmImage: macos-10.13
+    variables:
+      NODE_VERSION: 10
+    steps:
+      - template: azure-pipelines/jobs/test.yml
+
+  - job: Test_Linux
+    displayName: Test on Linux Node v10
+    pool:
+      vmImage: "Ubuntu 16.04"
+    variables:
+      NODE_VERSION: 10
+    steps:
+      - template: azure-pipelines/jobs/test.yml

azure-pipelines/jobs/lint.yml

@@ -0,0 +1,5 @@
+steps:
+  - template: ../steps/install-nodejs.yml
+  - template: ../steps/install-dependencies.yml
+  - script: yarn lint
+    displayName: "Lint"

azure-pipelines/jobs/test.yml

@@ -0,0 +1,5 @@
+steps:
+  - template: ../steps/install-nodejs.yml
+  - template: ../steps/install-dependencies.yml
+  - script: yarn test
+    displayName: "Run tests"

azure-pipelines/steps/install-dependencies.yml

@@ -0,0 +1,3 @@
+steps:
+  - script: yarn install --frozen-lockfile
+    displayName: "Install dependencies"

azure-pipelines/steps/install-nodejs.yml

@@ -0,0 +1,5 @@
+steps:
+  - task: NodeTool@0
+    inputs:
+      versionSpec: "$(NODE_VERSION)"
+    displayName: "Install Node.js"

package.json

@@ -7,8 +7,8 @@
   "scripts": {
     "build": "tsc --project .",
     "clean": "rimraf cache coverage dist",
-    "format": "prettier --write {*,src/**/*}.{md,js,json,ts}",
-    "lint": "tsc --project . --noEmit && tslint --project . && prettier --check {*,src/**/*}.{md,js,json,ts}",
+    "format": "prettier --write {*,{azure-pipelines,src}/**/*}.{md,js,json,ts,yml}",
+    "lint": "tsc --project . --noEmit && tslint --project . && prettier --check {*,{azure-pipelines,src}/**/*}.{md,js,json,ts,yml}",
     "test": "yarn clean && yarn build && jest",
     "prepublishOnly": "yarn lint && yarn test"
   },