chore: Update to Gulp 4.

chore: Updated npm deps.
chore: Added Appveyor config.
chore: Added eslint plugins.

.eslintrc

@@ -14,21 +14,27 @@
         "sourceType": "module"
     },
     "plugins": [
+        "chai-expect",
+        "mocha",
         "security"
     ],
     "root": true,
     "rules": {
-        "array-bracket-spacing": [ "error", "always" ],
+        "array-bracket-spacing": [ "error", "always", { "objectsInArrays": true, "arraysInArrays": true } ],
         "brace-style": [ 2, "1tbs", { "allowSingleLine": true } ],
         "camelcase": 0,
+        "chai-expect/missing-assertion": 2,
+        "chai-expect/terminating-properties": 1,
         "curly": [ 2, "all" ],
         "eol-last": 2,
         "indent": [ 2, "tab", { "SwitchCase": 1 } ],
         "keyword-spacing": [ "error" ],
         "linebreak-style": [ 2, "unix" ],
+        "max-len": [ 2, 200 ],
         "no-case-declarations": 0,
         "no-cond-assign": 0,
         "no-console": 0,
+        "no-control-regex": 0,
         "no-empty": 1,
         "no-inner-declarations": 0,
         "no-mixed-spaces-and-tabs": 2,

.travis.yml

@@ -1,12 +1,11 @@
 language: node_js
 node_js:
-  - "6"
   - "8"
   - "10"
 os: linux
 sudo: false
 before_install:
-  - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.7.0
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH=$HOME/.yarn/bin:$PATH
 cache:
   yarn: true

README.md

@@ -3,6 +3,7 @@
 [![NPM Version][npm-image]][npm-url]
 [![NPM Downloads][downloads-image]][downloads-url]
 [![Travis CI Build][travis-image]][travis-url]
+[![Appveyor CI Build][appveyor-image]][appveyor-url]
 [![Test Coverage][coveralls-image]][coveralls-url]
 [![Greenkeeper badge][greenkeeper-image]][greenkeeper-url]
 [![Deps][david-image]][david-url]
@@ -24,7 +25,7 @@ functions such as `JSON.stringify()` work as expected.
 
 ## Examples
 
-```javascript
+```js
 import gawk from 'gawk';
 
 const obj = gawk({
@@ -43,7 +44,7 @@ console.info(obj); // { foo: 'baz' }
 
 You can also be notified if a deep child is changed:
 
-```javascript
+```js
 const obj = gawk({
     foo: {
         bar: ['a', 'b']
@@ -63,7 +64,7 @@ console.info(obj); // { foo: { bar: ['a', 'b', 'c', 'd'] } }
 To filter watch notifications, simply pass in the property name or array of
 property names used to filter the gawk object.
 
-```javascript
+```js
 const obj = gawk({
 	foo: {
 		bar: 'hello'
@@ -79,7 +80,7 @@ obj.foo.bar = 'world!';
 
 To stop watching, simply call `gawk.unwatch()` with the original listener function.
 
-```javascript
+```js
 const obj = gawk({ /* ... */ });
 
 function onChange(obj, src) {
@@ -97,7 +98,7 @@ obj.foo = 'baz'; // does not fire onChange()
 
 To update an object and preserve the listeners, you can use the `gawk.set()` function.
 
-```javascript
+```js
 const obj = gawk({
 	foo: 'bar'
 });
@@ -251,10 +252,12 @@ MIT
 [npm-url]: https://npmjs.org/package/gawk
 [downloads-image]: https://img.shields.io/npm/dm/gawk.svg
 [downloads-url]: https://npmjs.org/package/gawk
-[travis-image]: https://img.shields.io/travis/cb1kenobi/gawk.svg
+[travis-image]: https://travis-ci.org/cb1kenobi/gawk.svg?branch=master
 [travis-url]: https://travis-ci.org/cb1kenobi/gawk
 [coveralls-image]: https://img.shields.io/coveralls/cb1kenobi/gawk/master.svg
 [coveralls-url]: https://coveralls.io/r/cb1kenobi/gawk
+[appveyor-image]: https://ci.appveyor.com/api/projects/status/1ee7r1drlswy5jk6?svg=true
+[appveyor-url]: https://ci.appveyor.com/project/cb1kenobi/gawk
 [greenkeeper-image]: https://badges.greenkeeper.io/cb1kenobi/gawk.svg
 [greenkeeper-url]: https://greenkeeper.io/
 [david-image]: https://img.shields.io/david/cb1kenobi/gawk.svg

appveyor.yml

@@ -0,0 +1,19 @@
+environment:
+  matrix:
+    # node.js
+    - nodejs_version: "10"
+    - nodejs_version: "8"
+
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - yarn
+
+test_script:
+  - node --version
+  - yarn --version
+  - yarn run coverage
+
+build: off
+
+# build version format
+version: "{build}"

gulpfile.js

@@ -9,25 +9,40 @@ const manifest   = require('./package.json');
 const path       = require('path');
 const spawnSync  = require('child_process').spawnSync;
 
+const { parallel, series } = gulp;
+
 const coverageDir = path.join(__dirname, 'coverage');
-const distDir = path.join(__dirname, 'dist');
-const docsDir = path.join(__dirname, 'docs');
+const distDir     = path.join(__dirname, 'dist');
+const docsDir     = path.join(__dirname, 'docs');
 
 /*
  * Clean tasks
  */
-gulp.task('clean', ['clean-coverage', 'clean-dist', 'clean-docs']);
-
-gulp.task('clean-coverage', cb => fs.remove(coverageDir, cb));
+async function cleanCoverage() { return fs.remove(coverageDir); }
+async function cleanDist() { return fs.remove(distDir); }
+async function cleanDocs() { return fs.remove(docsDir); }
+exports.clean = parallel(cleanCoverage, cleanDist, cleanDocs);
 
-gulp.task('clean-dist', cb => fs.remove(distDir, cb));
-
-gulp.task('clean-docs', cb => fs.remove(docsDir, cb));
+/*
+ * lint tasks
+ */
+async function lint(pattern) {
+	return gulp.src(pattern)
+		.pipe($.plumber())
+		.pipe($.eslint())
+		.pipe($.eslint.format())
+		.pipe($.eslint.failAfterError());
+}
+async function lintSrc() { return lint('src/**/*.js'); }
+async function lintTest() { return lint('test/**/test-*.js'); }
+exports['lint-src'] = lintSrc;
+exports['lint-test'] = lintTest;
+exports.lint = parallel(lintSrc, lintTest);
 
 /*
  * build tasks
  */
-gulp.task('build', ['clean-dist', 'lint-src'], function () {
+async function build() {
 	return gulp
 		.src('src/**/*.js')
 		.pipe($.plumber())
@@ -38,9 +53,11 @@ gulp.task('build', ['clean-dist', 'lint-src'], function () {
 		}))
 		.pipe($.sourcemaps.write())
 		.pipe(gulp.dest(distDir));
-});
+}
+exports.build = series(parallel(cleanDist, lintSrc), build);
+exports.default = exports.build;
 
-gulp.task('docs', ['lint-src', 'clean-docs'], () => {
+exports.docs = series(parallel(cleanDocs, lintSrc), async () => {
 	const esdoc = require('esdoc').default;
 
 	esdoc.generate({
@@ -69,30 +86,10 @@ gulp.task('docs', ['lint-src', 'clean-docs'], () => {
 	});
 });
 
-/*
- * lint tasks
- */
-function lint(pattern) {
-	return gulp.src(pattern)
-		.pipe($.plumber())
-		.pipe($.eslint())
-		.pipe($.eslint.format())
-		.pipe($.eslint.failAfterError());
-}
-
-gulp.task('lint-src', () => lint('src/**/*.js'));
-
-gulp.task('lint-test', () => lint('test/**/test-*.js'));
-
 /*
  * test tasks
  */
-gulp.task('test',          [ 'build', 'lint-test' ],                      () => runTests());
-gulp.task('test-only',     [ 'lint-test' ],                               () => runTests());
-gulp.task('coverage',      [ 'clean-coverage', 'lint-src', 'lint-test' ], () => runTests(true));
-gulp.task('coverage-only', [ 'clean-coverage', 'lint-test' ],             () => runTests(true));
-
-function runTests(cover) {
+async function runTests(cover) {
 	const args = [];
 	let { execPath } = process;
 
@@ -114,7 +111,6 @@ function runTests(cover) {
 			//   https://github.com/istanbuljs/istanbuljs/tree/master/packages/istanbul-reports/lib
 			'--reporter=html',
 			'--reporter=json',
-			'--reporter=lcov',
 			'--reporter=text',
 			'--reporter=text-summary',
 			'--require', path.join(__dirname, 'test', 'transpile.js'),
@@ -161,7 +157,7 @@ function runTests(cover) {
 		args.push('test/**/test-*.js');
 	}
 
-	log('Running: ' + ansiColors.cyan(execPath + ' ' + args.join(' ')));
+	log(`Running: ${ansiColors.cyan(`${execPath} ${args.join(' ')}`)}`);
 
 	// run!
 	if (spawnSync(execPath, args, { stdio: 'inherit' }).status) {
@@ -188,4 +184,7 @@ function resolveModule(name) {
 	}
 }
 
-gulp.task('default', ['build']);
+exports.test             = series(parallel(lintTest, build),                () => runTests());
+exports['test-only']     = series(lintTest,                                 () => runTests());
+exports.coverage         = series(parallel(cleanCoverage, lintTest, build), () => runTests(true));
+exports['coverage-only'] = series(parallel(cleanCoverage, lintTest),        () => runTests(true));

package.json

@@ -27,35 +27,35 @@
     "source-map-support": "^0.5.9"
   },
   "devDependencies": {
-    "@babel/core": "^7.1.2",
-    "@babel/plugin-transform-modules-commonjs": "^7.1.0",
+    "@babel/core": "^7.2.0",
+    "@babel/plugin-transform-modules-commonjs": "^7.2.0",
     "@babel/register": "^7.0.0",
-    "ansi-colors": "^3.1.0",
+    "ansi-colors": "^3.2.3",
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.4",
-    "babel-plugin-istanbul": "^5.0.1",
+    "babel-plugin-istanbul": "^5.1.0",
     "chai": "^4.2.0",
     "coveralls": "^3.0.2",
     "esdoc": "^1.1.0",
     "esdoc-ecmascript-proposal-plugin": "^1.0.0",
     "esdoc-standard-plugin": "^1.0.0",
-    "eslint": "^5.6.1",
+    "eslint": "^5.10.0",
+    "eslint-plugin-chai-expect": "^2.0.1",
     "eslint-plugin-mocha": "^5.2.0",
     "eslint-plugin-security": "^1.4.0",
-    "fancy-log": "^1.3.2",
-    "fs-extra": "^7.0.0",
-    "gulp": "^3.9.1",
+    "fancy-log": "^1.3.3",
+    "fs-extra": "^7.0.1",
+    "gulp": "^4.0.0",
     "gulp-babel": "^8.0.0",
     "gulp-debug": "^4.0.0",
     "gulp-eslint": "^5.0.0",
     "gulp-load-plugins": "^1.5.0",
-    "gulp-plumber": "^1.2.0",
+    "gulp-plumber": "^1.2.1",
     "gulp-sourcemaps": "^2.6.4",
-    "gulp-util": "^3.0.8",
     "mocha": "^5.2.0",
-    "nyc": "^13.0.1",
-    "sinon": "^6.3.4",
-    "sinon-chai": "^3.2.0"
+    "nyc": "^13.1.0",
+    "sinon": "^7.2.2",
+    "sinon-chai": "^3.3.0"
   },
   "homepage": "https://github.com/cb1kenobi/gawk",
   "bugs": "https://github.com/cb1kenobi/gawk/issues",