Initial project structure with some barebones layout, CSS and JS from game-data

gulpfile.js

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+const gulp = require('gulp');
+const sass = require('gulp-sass')(require('sass'));
+const coffee = require('gulp-coffee');
+const sourcemaps = require('gulp-sourcemaps');
+const plumber = require('gulp-plumber');
+
+// Compile .sass files to compressed CSS
+function compileSass() {
+  return gulp.src('assets/styles/**/*.sass')
+    .pipe(plumber())
+    .pipe(sass({ outputStyle: 'compressed' }).on('error', sass.logError))
+    .pipe(gulp.dest('public/css'));
+}
+
+// Compile .coffee files to JavaScript with source maps
+function compileCoffee() {
+  return gulp.src('assets/scripts/**/*.coffee', { sourcemaps: true })
+    .pipe(plumber())
+    .pipe(coffee({ bare: true }))
+    .pipe(gulp.dest('public/js', { sourcemaps: '.' }));
+}
+
+// Copy image files to public/img/
+function copyImages() {
+  return gulp.src('assets/img/**/*', {encoding: false})
+    .pipe(gulp.dest('public/img/'));
+}
+
+// Watch files for changes
+function watchFiles(cb) {
+  gulp.watch('assets/styles/**/*.sass', compileSass);
+  gulp.watch('assets/scripts/**/*.coffee', compileCoffee);
+  gulp.watch('assets/img/**/*', copyImages)
+  cb();
+}
+
+// Chain all asset builds together
+function buildAssets() {
+  return gulp.parallel(compileSass, compileCoffee, copyImages);
+}
+
+// Perform initial build then watch
+function buildAndWatch() {
+  return gulp.series(
+    buildAssets(),
+    watchFiles
+  );
+}
+
+// one-time build
+exports.build = buildAssets();
+
+// start builds with file watching
+exports.watch = buildAndWatch();
+
+// Define default task (defaults to watch)
+exports.default = exports.watch;