JavaScript heap out of memory in angular js gulp sourcemap ngannonate with babel

Question

I am using es6 syntax in my angular JS project but it throws error when run gulp build, search over github and So but some saying this is error due to gulp uglify w

Answer 1

The main cause was uglify plugin which does not work with es6 syntax so did this

1. npm install babel-cli -g

2. bower install gulp-uglify-es --save-dev

3. add plugin and update code in gulp/build.js

var uglify = require('gulp-uglify-es').default;

and wrire belowcinside gulp task

 .pipe($.sourcemaps.init())
    .pipe($.babel({"presets": [ ["es2015", { "modules": false} ] ], compact: false}))
    .pipe($.ngAnnotate())
    .pipe(uglify()).on('error', conf.errorHandler('Uglify'))
    .pipe($.sourcemaps.write('.'))

update package.json

{
  "name": "Project",
  "version": "0.0.0",
  "dependencies": {
    "gulp-open": "^2.0.0"
  },
  "scripts": {
    "test": "gulp test"
  },
  "devDependencies": {
    "babel": "^6.23.0",
    "babel-core": "^6.25.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-minify": "^0.2.0",
    "chalk": "~1.1.1",
    "del": "~2.0.2",
    "eslint-plugin-angular": "~0.12.0",
    "estraverse": "~4.1.0",
    "gulp": "~3.9.0",
    "gulp-angular-filesort": "~1.1.1",
    "gulp-angular-templatecache": "~1.8.0",
    "gulp-autoprefixer": "~3.0.2",
    "gulp-babel": "^7.0.0",
    "gulp-babel-minify": "^0.2.0",
    "gulp-clean-css": "~2.0.12",
    "gulp-connect": "^5.0.0",
    "gulp-eslint": "~1.0.0",
    "gulp-filter": "~3.0.1",
    "gulp-flatten": "~0.2.0",
    "gulp-html-replace": "^1.6.1",
    "gulp-htmlmin": "~2.0.0",
    "gulp-inject": "~3.0.0",
    "gulp-less": "~3.0.3",
    "gulp-livereload": "^3.8.1",
    "gulp-load-plugins": "~0.10.0",
    "gulp-merge": "^0.1.1",
    "gulp-ng-annotate": "~1.1.0",
    "gulp-ng-config": "^1.3.1",
    "gulp-order": "^1.1.1",
    "gulp-protractor": "~1.0.0",
    "gulp-rename": "~1.2.2",
    "gulp-replace": "~0.5.4",
    "gulp-rev": "~6.0.1",
    "gulp-rev-replace": "~0.4.2",
    "gulp-size": "~2.0.0",
    "gulp-sourcemaps": "~1.6.0",
    "gulp-uglify": "~1.4.1",
    "gulp-uglify-es": "^0.1.3",
    "gulp-useref": "~1.3.0",
    "gulp-util": "~3.0.6",
    "gulp-war": "^0.1.4",
    "gulp-zip": "^3.2.0",
    "gulp.spritesmith": "^6.3.0",
    "http-proxy-middleware": "~0.9.0",
    "klaw-sync": "^1.1.2",
    "lodash": "~4.0.0",
    "main-bower-files": "~2.9.0",
    "merge-stream": "^1.0.1",
    "path": "^0.12.7",
    "phantomjs": "~1.9.18",
    "uglify-es": "^3.0.28",
    "uglify-save-license": "~0.4.1",
    "wiredep": "~2.2.2"
  },
  "engines": {
    "node": ">=0.10.0"
  }
}