Importing lodash into angular2 + typescript application

I am having a hard time trying to get the lodash modules imported. I’ve setup my project using npm+gulp, and keep hitting the same wall. I’ve tried the regular lodash, but also lodash-es.

The lodash npm package: (has an index.js file in the package root folder)

import * as _ from 'lodash';    

Results in:

error TS2307: Cannot find module 'lodash'.

The lodash-es npm package: (has a default export in lodash.js i the package root folder)

import * as _ from 'lodash-es/lodash';

Results in:

error TS2307: Cannot find module 'lodash-es'.   

Both the gulp task and webstorm report the same issue.

Funny fact, this returns no error:

import 'lodash-es/lodash';

… but of course there is no “_” …

My tsconfig.json file:

{
  "compilerOptions": {
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false
  },
  "exclude": [
    "node_modules"
  ]
}

My gulpfile.js:

var gulp = require('gulp'),
    ts = require('gulp-typescript'),
    uglify = require('gulp-uglify'),
    sourcemaps = require('gulp-sourcemaps'),
    tsPath="app/**/*.ts";

gulp.task('ts', function () {
    var tscConfig = require('./tsconfig.json');
    
    gulp.src([tsPath])
        .pipe(sourcemaps.init())
        .pipe(ts(tscConfig.compilerOptions))
        .pipe(sourcemaps.write('./../js'));
});

gulp.task('watch', function() {
    gulp.watch([tsPath], ['ts']);
});

gulp.task('default', ['ts', 'watch']);

If I understood correctly, moduleResolution:’node’ in my tsconfig should point the import statements to the node_modules folder, where lodash and lodash-es are installed. I’ve also tried lots of different ways to import: absolute paths, relative paths, but nothing seems to work. Any ideas?

If necessary I can provide a small zip file to illustrate the problem.