ng annotate webpack loader with source map support

ng-annotate-loader.js

var ngAnnotate = require('ng-annotate');
var utils = require('loader-utils');
var SourceMapConsumer = require('source-map').SourceMapConsumer;
var SourceMapGenerator = require('source-map').SourceMapGenerator;

module.exports = function(content, sm) {
    var filename = utils.getCurrentRequest(this);

    var res = ngAnnotate(content, {
            add : true,
            sourcemap : {inline: false, inFile : filename, sourceRoot:filename}
        }
    );

    var mergeMap = null;
    if(sm) {
        var generator = SourceMapGenerator.fromSourceMap(new SourceMapConsumer(sm));
        generator.applySourceMap(new SourceMapConsumer(res.map), filename);
        mergeMap = generator.toString();
    }

    this.callback(null, res.src, mergeMap);
};

P.S. Made a PR to the repo that owns the ng-annotate-loader name on npm: andrey-skl/ng-annotate-loader#2