How to include Underscore.js in angular2 project built using angular-cli

Question

I want to include underscore.js inside angular2 project built using angular-cli. Till now I am unable to do so. I tried so far:

1- npm install underscore --save

2- tsd install underscore

3- script src="node_modules/underscore/underscore.js" , reference in index.html

4- inside system-config.js

/** Map relative paths to URLs. */
var map = {
    'underscore': '../node_modules/underscore/underscore.js'
};
/** User packages configuration. */
var packages = {
    'underscore': '../node_modules/underscore/underscore.js'
};

5- import * as _ from 'underscore';

But underscore.js is not getting copied in 'dist' directory during run-time , and browser complain of not finding underscore.js. I think I am missing something at Point#4. Any help is much appreciated as I am beginning learning angular2. Please remember that this project is made by angular-cli, and not by any other seed project. Other than Underscore.js, project is working fine.

[EDIT] package.json has "underscore": "^1.8.3" in dependencies

Community · Accepted Answer · 2017-05-23 12:26:24Z

8

Using Angular CLI 1.0.0-rc.1, the recommended solution is described here:

Angular2 2.4 How to load external libraries sush as Underscore into angular2.

npm install underscore --save // save to dependencies: required to run
npm install @types/underscore --save-dev // save to dev dependencies: required in dev mode

Then in your component class:

import * as _ from 'underscore';
...
subtitle = _.head(['xyz'])

Alternatively, there is another way to load "static" scripts in angular-cli as described here https://www.npmjs.com/package/angular-cli#global-library-installation:

In .angular-cli.json, add it to the scripts array:

"scripts": ["../node_modules/underscore/underscore.js"]

This will load underscore.js, but this is not a good way to make it available for use in your typescript classes.

edited May 23, 2017 at 12:26

CommunityBot

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answered Mar 17, 2017 at 17:31

Leonya

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Comments

Winnipass · Accepted Answer · 2016-12-13 13:44:56Z

4

install underscore using npm Go to yourappname/src/typings.d.ts and add this line declare module 'underscore'; then run ng build

edited Dec 13, 2016 at 13:44

answered Dec 13, 2016 at 13:00

Winnipass

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Comments

Hetal Sagar · Accepted Answer · 2016-09-18 22:26:31Z

Angular 2 full 3 file snippets

package.json

    {
  "name": "angular2-quickstart",
  "version": "1.0.0",
  "scripts": {
    "start": "tsc && concurrently \"npm run tsc:w\" \"npm run lite\" ",
    "lite": "lite-server",
    "postinstall": "typings install",
    "tsc": "tsc",
    "tsc:w": "tsc -w",
    "typings": "typings"
  },
  "license": "ISC",
  "dependencies": {
    "@angular/common": "2.0.0",
    "@angular/compiler": "2.0.0",
    "@angular/core": "2.0.0",
    "@angular/forms": "2.0.0",
    "@angular/http": "2.0.0",
    "@angular/platform-browser": "2.0.0",
    "@angular/platform-browser-dynamic": "2.0.0",
    "@angular/router": "3.0.0",
    "@angular/upgrade": "2.0.0",
    "angular2-in-memory-web-api": "0.0.20",
    "bootstrap": "^3.3.6",
    "core-js": "^2.4.1",
    "reflect-metadata": "^0.1.3",
    "rxjs": "5.0.0-beta.12",
    "systemjs": "0.19.27",
    "tsd": "^0.6.5",
    "underscore": "^1.8.3",
    "zone.js": "^0.6.23"
  },
  "devDependencies": {
    "concurrently": "^2.2.0",
    "lite-server": "^2.2.2",
    "typescript": "^2.0.2",
    "typings": "^1.3.2"
  }
}

systemjs.config.js

/**
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
  System.config({
    paths: {
      // paths serve as alias
      'npm:': 'node_modules/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      app: 'app',
      // angular bundles
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      // other libraries
      'rxjs':                       'npm:rxjs',
      'underscore':                 'npm:underscore',

      'angular2-in-memory-web-api': 'npm:angular2-in-memory-web-api',
    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.js',
        defaultExtension: 'js'
      },


      rxjs: {
        defaultExtension: 'js'
      },
      'underscore':{
       main: './underscore.js', 
       defaultExtension: 'js'
       },
      'angular2-in-memory-web-api': {
        main: './index.js',
        defaultExtension: 'js'
      }
    }
  });
})(this);

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false
  }
}

typings.json

{
  "globalDependencies": {
    "core-js": "registry:dt/core-js#0.0.0+20160725163759",
    "jasmine": "registry:dt/jasmine#2.2.0+20160621224255",
    "node": "registry:dt/node#6.0.0+20160909174046"
  },
  "ambientDependencies": {
    "underscore": "github:DefinitelyTyped/DefinitelyTyped/underscore/underscore.d.ts#f0990e288ac73d593e982995947567aa2643b828"
  }
}

1- npm install underscore --save 2- tsd install underscore (if tsd not install first install that) 3) now do npm install 4) then npm start

Emir Mamashov · Accepted Answer · 2017-05-18 13:58:07Z

1

install underscore:

npm i underscore --save

in angular-cli.json:

"scripts": [
        "../node_modules/underscore/underscore-min.js",
         ...
      ],

after run command:

ng build

in component:

declare var _: any;
@Component({...})

answered May 18, 2017 at 13:58

Emir Mamashov

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Comments

Naella · Accepted Answer · 2016-06-06 08:01:46Z

0

Do you have in your project a file called Package.json? If Yes, you can try to add this line

"underscore": "^1.8.3",

in the dependencies of this file.

Modifications in system-config.ts

var map = {

    "underscore": "node_modules/underscore",

  };

var packages = {
    'underscore':            { main: 'index.js', defaultExtension: 'js' }
  };

  var packageNames = [
    '@angular/common',
    '@angular/compiler',
    '@angular/core',
    '@angular/http',
    '@angular/platform-browser',
    '@angular/platform-browser-dynamic',
    '@angular/router-deprecated',
    '@angular/testing',
    '@angular/upgrade',
  ];

packageNames.forEach(function(pkgName) {
    packages[pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

var config = {
    map: map,
    packages: packages,
    paths: {
      "underscore": "/node_modules/underscore.js"
    }
  };

And to do a npm install after that.

edited Jun 6, 2016 at 8:01

answered Jun 4, 2016 at 12:45

Naella

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3 Comments

raju Over a year ago

Yes, package.json has this, but it is not updating system-config.ts

Naella Over a year ago

If you need to update system-config.ts, you must do it manually, as you did with package.json. And npm install, after all this modifications.

raju Over a year ago

I tried your steps, but when running ng serve, it give error ' Cannot find module Underscore'. Can you please provide a working plnkr for this. Thanks in advance

DNRN · Accepted Answer · 2016-06-09 07:26:03Z

0

I think you might have missed a step? Did you remember to setup underscore in the "angular-cli-build.js" file? This step tells clingon to put underscore in the vendor folder (/dist/vendor).

Here's how I got underscore working.

Install underscore and typings:

npm install underscore --save
typings install underscore --save --ambient

Setting up underscore in "angular-cli-build.js":

module.exports = function(defaults) {
  return new Angular2App(defaults, {
    vendorNpmFiles: [
      'systemjs/dist/system-polyfills.js',
      'systemjs/dist/system.src.js',
      'zone.js/dist/**/*.+(js|js.map)',
      'es6-shim/es6-shim.js',
      'reflect-metadata/**/*.+(js|js.map)',
      'rxjs/**/*.+(js|js.map)',
      '@angular/**/*.+(js|js.map)',
      'moment/moment.js',
      'underscore/underscore.js'
    ]
  });
};

Then underscore get compiled to the vendor folder (/dist/vendor), and now it's possible to point to this location from the system.config.ts file:

const map: any = {
  "underscore": "vendor/underscore/underscore.js",
  "moment": "vendor/moment/moments.js"
};

/** User packages configuration. */
const packages: any = {
  'underscore': {
    format: 'cjs'
  },
  'moment': {
    format: 'cjs'
  }
};

Remember to use the hole path including the .js hope this helps :)

I did the same as with moment, from the docs: https://github.com/angular/angular-cli/wiki/3rd-party-libs

edited Jun 9, 2016 at 7:26

answered Jun 8, 2016 at 20:19

DNRN

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6 Comments

raju Over a year ago

I will definitely try this today.

DNRN Over a year ago

Please let me know if there's anything I need to elaborate.

raju Over a year ago

typings install underscore --save --global give me this error "typings ERR! message Unable to find "underscore" ("npm") in the registry."

DNRN Over a year ago

You shouldn't install underscore global. just: npm install underscore --save

raju Over a year ago

Again this error :: typings install underscore --save --global

|

HappyCoder · Accepted Answer · 2017-09-19 11:46:52Z

0

I am using Angular-cli, all I did was to add this line in package.json

"underscore": "^1.8.3",

and then I Run:
1. npm install underscore --save
2. npm install

and it worked...

edited Sep 19, 2017 at 11:46

user8563428

answered Mar 4, 2017 at 13:05

HappyCoder

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