オレの gulp

.gitignore

node_modules

bundleconfig.json

[
  {
    "outputFileName": "bundle.js",
    "inputFiles": [
      "./src/**/*.js"
    ]
  }
]

gulpfile.js

var gulp = require('gulp');
var ngAnnotate = require('gulp-ng-annotate');
var uglify = require('gulp-uglify');
var sourcemaps = require('gulp-sourcemaps');
var concat = require('gulp-concat');
var merge = require('merge-stream');

var bundleconfig = require('./bundleconfig.json');

gulp.task('min:js', () => {
    var tasks = bundleconfig.map(bundle => 
        gulp.src(bundle.inputFiles, { base: "." })
            .pipe(sourcemaps.init({ loadMaps: true }))
            .pipe(concat(bundle.outputFileName))
            .pipe(ngAnnotate())
            .pipe(uglify())
            .pipe(gulp.dest("."))
            .pipe(sourcemaps.write("./"))
            .pipe(gulp.dest("."))
    );
    return merge(tasks);
});

gulp.task('watch', () => {
    bundleconfig.forEach(bundle => {
        gulp.watch(bundle.inputFiles, ["min:js"]);
    });
});

package.json

{
  "name": "name",
  "version": "1.0.0",
  "description": "",
  "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-concat": "^2.6.0",
    "gulp-ng-annotate": "^2.0.0",
    "gulp-sourcemaps": "^1.6.0",
    "gulp-uglify": "^2.0.0",
    "merge-stream": "^1.0.0"
  }
}