src/main/util/downloader.ts


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var fs = require('fs');
var request = require('request');
var progress = require('request-progress');

export type Progress = {
  percent:number,
  speed:number,
  size:{
    total:number,
    transfered:number
  },
  time:{
    elapsed:number,
    remaining:number
  }
};

export function download(url:string,targetLocation:string,onprogress: (state:Progress)=>void):Promise<any>{
  return new Promise((resolve:any,reject:any)=>{
    progress(request(url), {
      throttle: 500
    })
    .on('progress', onprogress)
    .on('error', reject)
    .on('end', resolve)
    .pipe(fs.createWriteStream(targetLocation));
  });
}