test: add missing packages and install test

package.json

@@ -57,6 +57,8 @@
     "@google-cloud/projectify": "^0.3.0",
     "@google-cloud/promisify": "^0.4.0",
     "@sindresorhus/is": "^0.15.0",
+    "@types/duplexify": "^3.6.0",
+    "@types/p-defer": "^1.0.3",
     "arrify": "^1.0.0",
     "async-each": "^1.0.1",
     "extend": "^3.0.1",
@@ -71,9 +73,9 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "@types/arrify": "^1.0.4",
+    "@types/execa": "^0.9.0",
     "@types/extend": "^3.0.0",
     "@types/mocha": "^5.2.5",
-    "@types/p-defer": "^1.0.3",
     "@types/proxyquire": "^1.3.28",
     "@types/sinon": "^7.0.0",
     "@types/through2": "^2.0.34",
@@ -83,11 +85,15 @@
     "eslint-config-prettier": "^4.0.0",
     "eslint-plugin-node": "^8.0.0",
     "eslint-plugin-prettier": "^3.0.0",
+    "execa": "^1.0.0",
     "gts": "^0.9.0",
-    "jsdoc-baseline": "git+https://github.com/hegemonic/jsdoc-baseline.git",
     "intelli-espower-loader": "^1.0.1",
     "jsdoc": "^3.5.5",
+    "jsdoc-baseline": "git+https://github.com/hegemonic/jsdoc-baseline.git",
+    "linkinator": "^1.1.2",
     "mocha": "^6.0.0",
+    "mv": "^2.1.1",
+    "ncp": "^2.0.0",
     "nyc": "^13.0.0",
     "power-assert": "^1.4.4",
     "prettier": "^1.9.1",
@@ -96,7 +102,6 @@
     "source-map-support": "^0.5.9",
     "through2": "^3.0.0",
     "typescript": "~3.3.0",
-    "uuid": "^3.1.0",
-    "linkinator": "^1.1.2"
+    "uuid": "^3.1.0"
   }
 }

system-test/fixtures/sample/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "pubsub-sample-fixture",
+  "description": "An app we're using to test the library.",
+  "scripts": {
+    "check": "gts check",
+    "clean": "gts clean",
+    "compile": "tsc -p .",
+    "fix": "gts fix",
+    "prepare": "npm run compile",
+    "pretest": "npm run compile",
+    "posttest": "npm run check",
+    "start": "node build/src/index.js"
+  },
+  "license": "Apache-2.0",
+  "dependencies": {
+    "@google-cloud/pubsub": "file:./pubsub.tgz"
+  },
+  "devDependencies": {
+    "@types/node": "^10.3.0",
+    "typescript": "^3.0.0",
+    "gts": "^0.9.0"
+  }
+}

system-test/fixtures/sample/src/index.ts

@@ -0,0 +1,8 @@
+import {PubSub} from '@google-cloud/pubsub';
+
+async function main() {
+  const pubsub = new PubSub();
+  console.log(pubsub);
+}
+
+main();

system-test/fixtures/sample/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "extends": "./node_modules/gts/tsconfig-google.json",
+  "compilerOptions": {
+    "rootDir": ".",
+    "outDir": "build",
+    "types": ["node"],
+    "skipLibCheck": true,
+  },
+  "include": [
+    "src/*.ts"
+  ]
+}

system-test/install.ts

@@ -0,0 +1,56 @@
+/**
+ * Copyright 2019 Google LLC. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as execa from 'execa';
+import * as mv from 'mv';
+import {ncp} from 'ncp';
+import * as tmp from 'tmp';
+import {promisify} from 'util';
+
+const keep = false;
+const mvp = promisify(mv) as {} as (...args: string[]) => Promise<void>;
+const ncpp = promisify(ncp);
+const stagingDir = tmp.dirSync({keep, unsafeCleanup: true});
+const stagingPath = stagingDir.name;
+const pkg = require('../../package.json');
+
+describe('📦 pack and install', () => {
+  /**
+   * Create a staging directory with temp fixtures used to test on a fresh
+   * application.
+   */
+  it('should be able to use the d.ts', async () => {
+    await execa('npm', ['pack', '--unsafe-perm']);
+    const tarball = `google-cloud-pubsub-${pkg.version}.tgz`;
+    await mvp(tarball, `${stagingPath}/pubsub.tgz`);
+    await ncpp('system-test/fixtures/sample', `${stagingPath}/`);
+    await execa(
+        'npm', ['install', '--unsafe-perm'],
+        {cwd: `${stagingPath}/`, stdio: 'inherit'});
+    await execa(
+        'node', ['--throw-deprecation', 'build/src/index.js'],
+        {cwd: `${stagingPath}/`, stdio: 'inherit'});
+  });
+
+  /**
+   * CLEAN UP - remove the staging directory when done.
+   */
+  after('cleanup staging', () => {
+    if (!keep) {
+      stagingDir.removeCallback();
+    }
+  });
+});