Gulp to copy js plus minified version

Gulpfile.js

var gulp = require('gulp'),
    hint = require('gulp-jshint'),
    uglify = require('gulp-uglify'),
    rename = require('gulp-rename');

gulp.task('lint', function() {
    return gulp.src(['Scripts/**/*.js'])
        .pipe(hint());
});

gulp.task('build-js', ['lint'], function() {
    return gulp.src(['Scripts/**/*.js'])
        .pipe(gulp.dest('wwwroot/js'))
        .pipe(uglify())
        .pipe(rename(function(path) {
            path.basename += '.min';
        })
        .pipe(gulp.dest('wwwroot/js'));
});

gulp.task('default', ['build-js']);

you missed closing bracket

var gulp = require('gulp'),
    hint = require('gulp-jshint'),
    uglify = require('gulp-uglify'),
    rename = require('gulp-rename');

gulp.task('lint', function() {
    return gulp.src(['Scripts/**/*.js'])
        .pipe(hint());
});

gulp.task('build-js', ['lint'], function() {
    return gulp.src(['Scripts/**/*.js'])
        .pipe(gulp.dest('wwwroot/js'))
        .pipe(uglify())
        .pipe(rename(function(path) {
            path.basename += '.min';
        }))
        .pipe(gulp.dest('wwwroot/js'));
});

gulp.task('default', ['build-js']);