Include only specified files in the NPM package

package.json

@@ -18,6 +18,13 @@
     "test": "node ./bin/jasmine.js",
     "posttest": "eslint \"bin/**/*.js\" \"lib/**/*.js\" \"spec/**/*.js\""
   },
+  "files": [
+    "bin",
+    "lib",
+    "MIT.LICENSE",
+    "package.json",
+    "README.md"
+  ],
   "dependencies": {
     "glob": "^7.1.6",
     "jasmine-core": "~3.7.0"
@@ -29,7 +36,8 @@
     "grunt": "^1.0.4",
     "grunt-cli": "^1.3.2",
     "shelljs": "^0.8.3",
-    "slash": "^3.0.0"
+    "slash": "^3.0.0",
+    "temp": "^0.9.4"
   },
   "eslintConfig": {
     "parserOptions": {

spec/npm_package_spec.js

@@ -0,0 +1,62 @@
+describe('npm package', function() {
+  var path = require('path'),
+    temp = require('temp').track(),
+    fs = require('fs');
+
+  beforeAll(function() {
+    var shell = require('shelljs'),
+      pack = shell.exec('npm pack', { silent: true });
+
+    this.tarball = pack.stdout.split('\n')[0];
+    this.tmpDir = temp.mkdirSync(); // automatically deleted on exit
+
+    var untar = shell.exec('tar -xzf ' + this.tarball + ' -C ' + this.tmpDir, {
+      silent: true
+    });
+    expect(untar.code).toBe(0);
+  });
+
+  beforeEach(function() {
+    jasmine.addMatchers({
+      toExistInPath: function() {
+        return {
+          compare: function(actual, expected) {
+            var fullPath = path.resolve(expected, actual);
+            return {
+              pass: fs.existsSync(fullPath)
+            };
+          }
+        };
+      }
+    });
+  });
+
+  afterAll(function() {
+    fs.unlinkSync(this.tarball);
+  });
+
+  it('has a jasmine script', function() {
+    expect('package/bin/jasmine.js').toExistInPath(this.tmpDir);
+  });
+
+  it('has a jasmine module', function() {
+    expect('package/lib/jasmine.js').toExistInPath(this.tmpDir);
+  });
+
+  it('contains only the expected root entries', function() {
+    const files = fs.readdirSync(this.tmpDir);
+    expect(files).toEqual(['package']);
+  });
+
+  it('contains only the expected entries in the package dir', function() {
+    const files = fs.readdirSync(path.resolve(this.tmpDir, 'package'));
+    files.sort();
+    expect(files).toEqual([
+      'MIT.LICENSE',
+      'README.md',
+      'bin',
+      'lib',
+      'package.json',
+    ]);
+  });
+});

spec/support/jasmine.json

@@ -7,6 +7,7 @@
     "loader_spec.js",
     "manager_spec.js",
     "run_spec.js",
+    "npm_package_spec.js",
     "reporters/**/*[sS]pec.js",
     "filters/**/*[sS]pec.js"
   ],