👔 install eslint; run eslint . --fix

👔 fix lints

.eslintrc.js

@@ -0,0 +1,20 @@
+/* eslint-env node */
+
+module.exports = {
+  plugins: [ 'metafizzy' ],
+  extends: 'plugin:metafizzy/browser',
+  env: {
+    browser: true,
+    commonjs: true,
+  },
+  parserOptions: {
+    ecmaVersion: 2018,
+  },
+  globals: {
+    InfiniteScroll: 'readonly',
+    QUnit: 'readonly',
+    define: 'readonly',
+  },
+  rules: {
+  },
+};

.nvmrc

@@ -0,0 +1 @@
+14

gulpfile.js

@@ -1,55 +1,55 @@
-/*jshint node: true, strict: false */
+/* eslint-env node */
 
-var fs = require('fs');
-var gulp = require('gulp');
-var rename = require('gulp-rename');
-var replace = require('gulp-replace');
+let fs = require('fs');
+let gulp = require('gulp');
+let rename = require('gulp-rename');
+let replace = require('gulp-replace');
 
 // ----- hint ----- //
 
-var jshint = require('gulp-jshint');
+let jshint = require('gulp-jshint');
 
 gulp.task( 'hint-js', function() {
   return gulp.src('js/**/*.js')
     .pipe( jshint() )
     .pipe( jshint.reporter('default') );
-});
+} );
 
 gulp.task( 'hint-test', function() {
   return gulp.src('test/unit/*.js')
     .pipe( jshint() )
     .pipe( jshint.reporter('default') );
-});
+} );
 
 gulp.task( 'hint-task', function() {
   return gulp.src('gulpfile.js')
     .pipe( jshint() )
     .pipe( jshint.reporter('default') );
-});
+} );
 
-var jsonlint = require('gulp-json-lint');
+let jsonlint = require('gulp-json-lint');
 
 gulp.task( 'jsonlint', function() {
-  return gulp.src( '*.json' )
+  return gulp.src('*.json')
     .pipe( jsonlint() )
     .pipe( jsonlint.report('verbose') );
-});
+} );
 
-gulp.task( 'hint', [ 'hint-js', 'hint-test', 'hint-task', 'jsonlint' ]);
+gulp.task( 'hint', [ 'hint-js', 'hint-test', 'hint-task', 'jsonlint' ] );
 
 // -------------------------- RequireJS makes pkgd -------------------------- //
 
-var gutil = require('gulp-util');
-var chalk = require('chalk');
-var rjsOptimize = require('gulp-requirejs-optimize');
+let gutil = require('gulp-util');
+let chalk = require('chalk');
+let rjsOptimize = require('gulp-requirejs-optimize');
 
 // regex for banner comment
-var reBannerComment = new RegExp('^\\s*(?:\\/\\*[\\s\\S]*?\\*\\/)\\s*');
+let reBannerComment = new RegExp('^\\s*(?:\\/\\*[\\s\\S]*?\\*\\/)\\s*');
 
 function getBanner() {
-  var src = fs.readFileSync( 'js/index.js', 'utf8' );
-  var matches = src.match( reBannerComment );
-  var banner = matches[0].replace( 'Infinite Scroll', 'Infinite Scroll PACKAGED' );
+  let src = fs.readFileSync( 'js/index.js', 'utf8' );
+  let matches = src.match( reBannerComment );
+  let banner = matches[0].replace( 'Infinite Scroll', 'Infinite Scroll PACKAGED' );
   return banner;
 }
 
@@ -58,8 +58,8 @@ function addBanner( str ) {
 }
 
 gulp.task( 'requirejs', function() {
-  var banner = getBanner();
-  var definitionRE = /define\(\s*'infinite-scroll\/js\/index'(.|\n)+\],\s*factory/;
+  let banner = getBanner();
+  let definitionRE = /define\(\s*'infinite-scroll\/js\/index'(.|\n)+\],\s*factory/;
   // HACK src is not needed
   // should refactor rjsOptimize to produce src
   return gulp.src('js/index.js')
@@ -69,52 +69,51 @@ gulp.task( 'requirejs', function() {
       include: [
         'jquery-bridget/jquery-bridget',
         'infinite-scroll/js/index',
-        'imagesloaded/imagesloaded'
+        'imagesloaded/imagesloaded',
       ],
       paths: {
         'infinite-scroll': '../',
-        jquery: 'empty:'
-      }
+        jquery: 'empty:',
+      },
     }) )
     // munge AMD definition
     .pipe( replace( definitionRE, function( definition ) {
       // remove named module
       return definition.replace( "'infinite-scroll/js/index',", '' )
         // use explicit file paths, './history' -> 'infinite-scroll/js/history'
         .replace( /'.\//g, "'infinite-scroll/js/" );
-    }) )
+    } ) )
     // add banner
     .pipe( addBanner( banner ) )
     .pipe( rename('infinite-scroll.pkgd.js') )
     .pipe( gulp.dest('dist') );
-});
-
+} );
 
 // ----- uglify ----- //
 
-var uglify = require('gulp-uglify');
+let uglify = require('gulp-uglify');
 
 gulp.task( 'uglify', [ 'requirejs' ], function() {
-  var banner = getBanner();
+  let banner = getBanner();
   gulp.src('dist/infinite-scroll.pkgd.js')
     .pipe( uglify() )
     // add banner
     .pipe( addBanner( banner ) )
     .pipe( rename('infinite-scroll.pkgd.min.js') )
     .pipe( gulp.dest('dist') );
-});
+} );
 
 // ----- version ----- //
 
 // set version in source files
 
-var minimist = require('minimist');
+let minimist = require('minimist');
 
 // use gulp version -t 1.2.3
 gulp.task( 'version', function() {
-  var args = minimist( process.argv.slice(3) );
-  var version = args.t;
-  if ( !version || !/\d\.\d\.\d/.test( version ) ) {
+  let args = minimist( process.argv.slice( 3 ) );
+  let version = args.t;
+  if ( !version || !( /\d\.\d\.\d/ ).test( version ) ) {
     gutil.log( 'invalid version: ' + chalk.red( version ) );
     return;
   }
@@ -127,11 +126,11 @@ gulp.task( 'version', function() {
   gulp.src('package.json')
     .pipe( replace( /"version": "\d\.\d+\.\d+"/, '"version": "' + version + '"' ) )
     .pipe( gulp.dest('.') );
-});
+} );
 
 // ----- default ----- //
 
 gulp.task( 'default', [
   'hint',
   'uglify',
-]);
+] );

js/button.js

@@ -1,28 +1,27 @@
 // button
 ( function( window, factory ) {
   // universal module definition
-  /* globals define, module, require */
   if ( typeof define == 'function' && define.amd ) {
     // AMD
     define( [
       './core',
       'fizzy-ui-utils/utils',
     ], function( InfiniteScroll, utils ) {
       return factory( window, InfiniteScroll, utils );
-    });
+    } );
   } else if ( typeof module == 'object' && module.exports ) {
     // CommonJS
     module.exports = factory(
-      window,
-      require('./core'),
-      require('fizzy-ui-utils')
+        window,
+        require('./core'),
+        require('fizzy-ui-utils'),
     );
   } else {
     // browser global
     factory(
-      window,
-      window.InfiniteScroll,
-      window.fizzyUIUtils
+        window,
+        window.InfiniteScroll,
+        window.fizzyUIUtils,
     );
   }
 
@@ -31,10 +30,9 @@
 // InfiniteScroll.defaults.button = null;
 
 InfiniteScroll.create.button = function() {
-  var buttonElem = utils.getQueryElement( this.options.button );
+  let buttonElem = utils.getQueryElement( this.options.button );
   if ( buttonElem ) {
     this.button = new InfiniteScrollButton( buttonElem, this );
-    return;
   }
 };
 
@@ -85,4 +83,4 @@ InfiniteScroll.Button = InfiniteScrollButton;
 
 return InfiniteScroll;
 
-}));
+} ) );