Gulp Images Failing in Ubuntu 16 - node.js

Question

I'm running my own Ubuntu 16.04.1 droplet and have just installed 'nodejs', npm, and bower globally. Then installed npm and bower on the Sage theme I've been working with. I'm able to gulp almost everything but once I get to images, I'm thrown with an error I've been having trouble diagnosing. Any help is always much appreciated!
root#myserver-ubuntu:/var/www/html/mydomain.com/public_html/bedrock/web/app/themes/mytheme# gulp images
[00:46:45] Using gulpfile /var/www/html/mydomain.com/public_html/bedrock/web/app/themes/mytheme/gulpfile.js
[00:46:45] Starting 'images'...
events.js:141
throw er; // Unhandled 'error' event
^
Error: Command failed: /var/www/html/mydomain.com/public_html/bedrock/web/app/themes/mytheme/node_modules/optipng-bin/vendor/optipng -strip all -clobber -force -fix -o 2 -out /tmp/2fd7e3c1-977c-4ac4-9886-a84ecd44e9e8 /tmp/49ebf02e-f383-46e2-bc40-d6b03b441380
/var/www/html/mydomain.com/public_html/bedrock/web/app/themes/mytheme/node_modules/optipng-bin/vendor/optipng: 1: /var/www/html/mydomain.com/public_html/bedrock/web/app/themes/mytheme/node_modules/optipng-bin/vendor/optipng: Syntax error: "(" unexpected
at ChildProcess.exithandler (child_process.js:213:12)
at emitTwo (events.js:87:13)
at ChildProcess.emit (events.js:172:7)
at maybeClose (internal/child_process.js:821:16)
at Socket.<anonymous> (internal/child_process.js:319:11)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at Pipe._onclose (net.js:469:12)
This is the gulpfile.js -
// ## Globals
var argv = require('minimist')(process.argv.slice(2));
var autoprefixer = require('gulp-autoprefixer');
var browserSync = require('browser-sync').create();
var changed = require('gulp-changed');
var concat = require('gulp-concat');
var flatten = require('gulp-flatten');
var gulp = require('gulp');
var gulpif = require('gulp-if');
var imagemin = require('gulp-imagemin');
var jshint = require('gulp-jshint');
var lazypipe = require('lazypipe');
var less = require('gulp-less');
var merge = require('merge-stream');
var cssNano = require('gulp-cssnano');
var plumber = require('gulp-plumber');
var rev = require('gulp-rev');
var runSequence = require('run-sequence');
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var uglify = require('gulp-uglify');
// See https://github.com/austinpray/asset-builder
var manifest = require('asset-builder')('./assets/manifest.json');
// `path` - Paths to base asset directories. With trailing slashes.
// - `path.source` - Path to the source files. Default: `assets/`
// - `path.dist` - Path to the build directory. Default: `dist/`
var path = manifest.paths;
// `config` - Store arbitrary configuration values here.
var config = manifest.config || {};
// `globs` - These ultimately end up in their respective `gulp.src`.
// - `globs.js` - Array of asset-builder JS dependency objects. Example:
// ```
// {type: 'js', name: 'main.js', globs: []}
// ```
// - `globs.css` - Array of asset-builder CSS dependency objects. Example:
// ```
// {type: 'css', name: 'main.css', globs: []}
// ```
// - `globs.fonts` - Array of font path globs.
// - `globs.images` - Array of image path globs.
// - `globs.bower` - Array of all the main Bower files.
var globs = manifest.globs;
// `project` - paths to first-party assets.
// - `project.js` - Array of first-party JS assets.
// - `project.css` - Array of first-party CSS assets.
var project = manifest.getProjectGlobs();
// CLI options
var enabled = {
// Enable static asset revisioning when `--production`
rev: argv.production,
// Disable source maps when `--production`
maps: !argv.production,
// Fail styles task on error when `--production`
failStyleTask: argv.production,
// Fail due to JSHint warnings only when `--production`
failJSHint: argv.production,
// Strip debug statments from javascript when `--production`
stripJSDebug: argv.production
};
// Path to the compiled assets manifest in the dist directory
var revManifest = path.dist + 'assets.json';
// ## Reusable Pipelines
// See https://github.com/OverZealous/lazypipe
// ### CSS processing pipeline
// Example
// ```
// gulp.src(cssFiles)
// .pipe(cssTasks('main.css')
// .pipe(gulp.dest(path.dist + 'styles'))
// ```
var cssTasks = function(filename) {
return lazypipe()
.pipe(function() {
return gulpif(!enabled.failStyleTask, plumber());
})
.pipe(function() {
return gulpif(enabled.maps, sourcemaps.init());
})
.pipe(function() {
return gulpif('*.less', less());
})
.pipe(function() {
return gulpif('*.scss', sass({
outputStyle: 'nested', // libsass doesn't support expanded yet
precision: 10,
includePaths: ['.'],
errLogToConsole: !enabled.failStyleTask
}));
})
.pipe(concat, filename)
.pipe(autoprefixer, {
browsers: [
'last 2 versions',
'android 4',
'opera 12'
]
})
.pipe(cssNano, {
safe: true
})
.pipe(function() {
return gulpif(enabled.rev, rev());
})
.pipe(function() {
return gulpif(enabled.maps, sourcemaps.write('.', {
sourceRoot: 'assets/styles/'
}));
})();
};
// ### JS processing pipeline
// Example
// ```
// gulp.src(jsFiles)
// .pipe(jsTasks('main.js')
// .pipe(gulp.dest(path.dist + 'scripts'))
// ```
var jsTasks = function(filename) {
return lazypipe()
.pipe(function() {
return gulpif(enabled.maps, sourcemaps.init());
})
.pipe(concat, filename)
.pipe(uglify, {
compress: {
'drop_debugger': enabled.stripJSDebug
}
})
.pipe(function() {
return gulpif(enabled.rev, rev());
})
.pipe(function() {
return gulpif(enabled.maps, sourcemaps.write('.', {
sourceRoot: 'assets/scripts/'
}));
})();
};
// ### Write to rev manifest
// If there are any revved files then write them to the rev manifest.
// See https://github.com/sindresorhus/gulp-rev
var writeToManifest = function(directory) {
return lazypipe()
.pipe(gulp.dest, path.dist + directory)
.pipe(browserSync.stream, {match: '**/*.{js,css}'})
.pipe(rev.manifest, revManifest, {
base: path.dist,
merge: true
})
.pipe(gulp.dest, path.dist)();
};
// ## Gulp tasks
// Run `gulp -T` for a task summary
// ### Styles
// `gulp styles` - Compiles, combines, and optimizes Bower CSS and project CSS.
// By default this task will only log a warning if a precompiler error is
// raised. If the `--production` flag is set: this task will fail outright.
gulp.task('styles', ['wiredep'], function() {
var merged = merge();
manifest.forEachDependency('css', function(dep) {
var cssTasksInstance = cssTasks(dep.name);
if (!enabled.failStyleTask) {
cssTasksInstance.on('error', function(err) {
console.error(err.message);
this.emit('end');
});
}
merged.add(gulp.src(dep.globs, {base: 'styles'})
.pipe(cssTasksInstance));
});
return merged
.pipe(writeToManifest('styles'));
});
// ### Scripts
// `gulp scripts` - Runs JSHint then compiles, combines, and optimizes Bower JS
// and project JS.
gulp.task('scripts', ['jshint'], function() {
var merged = merge();
manifest.forEachDependency('js', function(dep) {
merged.add(
gulp.src(dep.globs, {base: 'scripts'})
.pipe(jsTasks(dep.name))
);
});
return merged
.pipe(writeToManifest('scripts'));
});
// ### Fonts
// `gulp fonts` - Grabs all the fonts and outputs them in a flattened directory
// structure. See: https://github.com/armed/gulp-flatten
gulp.task('fonts', function() {
return gulp.src(globs.fonts)
.pipe(flatten())
.pipe(gulp.dest(path.dist + 'fonts'))
.pipe(browserSync.stream());
});
// ### Images
// `gulp images` - Run lossless compression on all the images.
gulp.task('images', function() {
return gulp.src(globs.images)
.pipe(imagemin({
progressive: true,
interlaced: true,
svgoPlugins: [{removeUnknownsAndDefaults: false}, {cleanupIDs: false}]
}))
.pipe(gulp.dest(path.dist + 'images'))
.pipe(browserSync.stream());
});
// ### JSHint
// `gulp jshint` - Lints configuration JSON and project JS.
gulp.task('jshint', function() {
return gulp.src([
'bower.json', 'gulpfile.js'
].concat(project.js))
.pipe(jshint())
.pipe(jshint.reporter('jshint-stylish'))
.pipe(gulpif(enabled.failJSHint, jshint.reporter('fail')));
});
// ### Clean
// `gulp clean` - Deletes the build folder entirely.
gulp.task('clean', require('del').bind(null, [path.dist]));
// ### Watch
// `gulp watch` - Use BrowserSync to proxy your dev server and synchronize code
// changes across devices. Specify the hostname of your dev server at
// `manifest.config.devUrl`. When a modification is made to an asset, run the
// build step for that asset and inject the changes into the page.
// See: http://www.browsersync.io
gulp.task('watch', function() {
browserSync.init({
files: ['{lib,templates}/**/*.php', '*.php'],
proxy: config.devUrl,
snippetOptions: {
whitelist: ['/wp-admin/admin-ajax.php'],
blacklist: ['/wp-admin/**']
}
});
gulp.watch([path.source + 'styles/**/*'], ['styles']);
gulp.watch([path.source + 'scripts/**/*'], ['jshint', 'scripts']);
gulp.watch([path.source + 'fonts/**/*'], ['fonts']);
gulp.watch([path.source + 'images/**/*'], ['images']);
gulp.watch(['bower.json', 'assets/manifest.json'], ['build']);
});
// ### Build
// `gulp build` - Run all the build tasks but don't clean up beforehand.
// Generally you should be running `gulp` instead of `gulp build`.
gulp.task('build', function(callback) {
runSequence('styles',
'scripts',
['fonts', 'images'],
callback);
});
// ### Wiredep
// `gulp wiredep` - Automatically inject Less and Sass Bower dependencies. See
// https://github.com/taptapship/wiredep
gulp.task('wiredep', function() {
var wiredep = require('wiredep').stream;
return gulp.src(project.css)
.pipe(wiredep())
.pipe(changed(path.source + 'styles', {
hasChanged: changed.compareSha1Digest
}))
.pipe(gulp.dest(path.source + 'styles'));
});
// ### Gulp
// `gulp` - Run a complete build. To compile for production run `gulp --production`.
gulp.task('default', ['clean'], function() {
gulp.start('build');
});

Answer 1

I will update this for anybody that may fall here in the future.
I couldn't locate the exact reason why gulp failed, my guess is that it's a spacing/tab bug. I deleted node_modules from the sage theme and reran npm install, and the error corrected itself.