fix: Node 12+ crashes gulp icons, requires gulp-^4.0.0

Fix vaadin#85

* gulp-^4.0.0 is provided by @vaadin/vaadin-component-dev-dependencies-^2.0.0

* .eslintrc.json: `async` functions require `parserOptions.ecmaVersion = 8`

* Gulpfile: Gulp 4 task architecture uses `gulp.series()` and
  `.parallel()` async strategy

  We use `.parallel()` only for lint tasks operating on distinct file sets

* Gulpfile: add simple `.on('error')` report callbacks to task pipelines
  missing such, avoid `events.js unhandled 'error' event` warnings if
  any pipeline reports errors

* Gulpfile: on Linux, `base64` requires explicit `-w 0` to disable line wrapping

@todo Not sure why `font-icons.html` output produces a reverse of
      unicode characters for `--lumo-icons-eye` vs `--lumo-icons-eye-disabled`

      Is the original commit faulty perhaps?

@todo Test for vaadin#66

.eslintrc.json

@@ -5,6 +5,9 @@
     "node": true,
     "es6": true
   },
+  "parserOptions": {
+    "ecmaVersion": 8
+  },
   "plugins": [
     "html"
   ],

font-icons.html

@@ -6,7 +6,7 @@
   <style>
     @font-face {
       font-family: 'lumo-icons';
-      src: url(data:application/font-woff;charset=utf-8;base64,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) format('woff');
+      src: url(data:application/font-woff;charset=utf-8;base64,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) format('woff');
       font-weight: normal;
       font-style: normal;
     }
@@ -38,8 +38,8 @@
       --lumo-icons-dropdown: "\ea18";
       --lumo-icons-edit: "\ea19";
       --lumo-icons-error: "\ea1a";
-      --lumo-icons-eye: "\ea1b";
-      --lumo-icons-eye-disabled: "\ea1c";
+      --lumo-icons-eye-disabled: "\ea1b";
+      --lumo-icons-eye: "\ea1c";
       --lumo-icons-menu: "\ea1d";
       --lumo-icons-minus: "\ea1e";
       --lumo-icons-ordered-list: "\ea1f";

gulpfile.js

@@ -11,19 +11,20 @@ var grepContents = require('gulp-grep-contents');
 var clip = require('gulp-clip-empty-files');
 var git = require('gulp-git');
 
-gulp.task('lint', ['lint:js', 'lint:html', 'lint:css']);
-
-gulp.task('lint:js', function() {
+gulp.task('lint:js', async function() {
   return gulp.src([
     '*.js',
     'test/*.js'
   ])
     .pipe(eslint())
     .pipe(eslint.format())
-    .pipe(eslint.failAfterError('fail'));
+    .pipe(eslint.failAfterError('fail'))
+    .on('error', function(err) {
+      return console.error(err);
+    });
 });
 
-gulp.task('lint:html', function() {
+gulp.task('lint:html', async function() {
   return gulp.src([
     '*.html',
     'demo/**/*.html',
@@ -35,10 +36,13 @@ gulp.task('lint:html', function() {
     }))
     .pipe(eslint())
     .pipe(eslint.format())
-    .pipe(eslint.failAfterError('fail'));
+    .pipe(eslint.failAfterError('fail'))
+    .on('error', function(err) {
+      return console.error(err);
+    });
 });
 
-gulp.task('lint:css', function() {
+gulp.task('lint:css', async function() {
   return gulp.src([
     '*.html',
     'demo/**/*.html',
@@ -52,10 +56,13 @@ gulp.task('lint:css', function() {
       reporters: [
         {formatter: 'string', console: true}
       ]
-    }));
+    }))
+    .on('error', function(err) {
+      return console.error(err);
+    });
 });
 
-gulp.task('version:check', function() {
+gulp.task('version:check', async function() {
   const expectedVersion = new RegExp('^' + require('./package.json').version + '$');
   return gulp.src(['*.html'])
     .pipe(htmlExtract({sel: 'script'}))
@@ -66,7 +73,7 @@ gulp.task('version:check', function() {
     .pipe(expect({reportUnexpected: true}, []));
 });
 
-gulp.task('version:update', function() {
+gulp.task('version:update', async function() {
   // Should be run from 'preversion'
   // Assumes that the old version is in package.json and the new version in the `npm_package_version` environment variable
   const oldversion = require('./package.json').version;
@@ -92,7 +99,7 @@ var fs = require('fs');
 var svgpath = require('svgpath');
 var svgmin = require('gulp-svgmin');
 
-gulp.task('icons', function() {
+gulp.task('icons', async function() {
   var folder = 'icons/svg/';
   var glyphs;
 
@@ -181,7 +188,7 @@ gulp.task('icons', function() {
         .pipe(gulp.dest('.'))
         .on('finish', function(args) {
           // Generate base64 version of the font
-          exec('base64 lumo-icons.woff', function(err, stdout, stderr) {
+          exec('base64 -w 0 lumo-icons.woff', function(err, stdout, stderr) {
             // Write the output to font-icons.html
             var output = `<!-- NOTICE: Generated with 'gulp icons' -->
 <link rel="import" href="../polymer/lib/elements/custom-style.html">
@@ -214,8 +221,14 @@ gulp.task('icons', function() {
             });
 
             // Cleanup
-            fs.unlink('lumo-icons.woff');
+            fs.unlink('lumo-icons.woff', function(err) {
+              if (err) {
+                return console.error(err);
+              }
+            });
           });
         });
     });
 });
+
+gulp.task('lint', gulp.parallel('lint:js', gulp.series('lint:html', 'lint:css')));

package.json

@@ -31,7 +31,7 @@
     "preversion": "gulp version:update"
   },
   "devDependencies": {
-    "@vaadin/vaadin-component-dev-dependencies": "^1.0.0",
+    "@vaadin/vaadin-component-dev-dependencies": "^2.0.0",
     "gulp-iconfont": "^9.1.0",
     "gulp-svgmin": "^1.2.4",
     "svgicons2svgfont": "^9.0.2"