enh: remove gulp-eslint

package.json

@@ -65,7 +65,6 @@
     "gulp": "4.0.2",
     "gulp-bump": "3.2.0",
     "gulp-conventional-changelog": "4.0.0",
-    "gulp-eslint": "6.0.0",
     "gulp-git": "2.10.1",
     "gulp-jasmine": "4.0.0",
     "jasmine": "3.10.0",

scripts/lint/index.js

@@ -23,7 +23,6 @@
  */
 
 const path = require('path');
-const gulp = require('gulp');
 const log = require('../log');
 const config = require('../config');
 
@@ -35,8 +34,7 @@ module.exports = function lint() {
     return Promise.resolve();
   }
 
-  const eslint = require('gulp-eslint');
-  const src = [
+  const inputs = [
     path.join(config.root, '*.js'),
     path.join(config.src, '**', '*.js'),
     path.join(config.test, '**', '*.js'),
@@ -50,12 +48,23 @@ module.exports = function lint() {
 
   log.debug('Linting files: ');
 
-  src.forEach((input) => (
+  inputs.forEach((input) => (
     log.debug(`  ${input}`)
   ));
 
-  return gulp.src(src)
-      .pipe(eslint())
-      .pipe(eslint.format())
-      .pipe(eslint.failAfterError());
+  const {ESLint} = require('eslint');
+  const fancyLog = require('fancy-log');
+  const eslint = new ESLint({
+    errorOnUnmatchedPattern: false,
+  });
+
+  const lintFiles = eslint.lintFiles(inputs);
+  const loadFormatter = eslint.loadFormatter('stylish');
+
+  return Promise.all([lintFiles, loadFormatter]).then(([results, formatter]) => {
+    if (results.errorCount > 0 || results.warningCount > 0) {
+      fancyLog(formatter.format(results));
+      throw new Error('ESLintError');
+    }
+  });
 };