how to export environment variable using newman API

Question

i'm running a postman test suit using newman api. Its executing properly as expected but i want to export environment variable generated during test execution in file, in command line it is possible using --export-environment:

newman run collectionPreReq.json -e Environment.json -k --export-environment newmanExport.json 

for the same i'm writing javascript to get environment exported by collectionPreReq but not getting what i'm looking for, the code is

var newman = require('newman');

newman.run({
    collection: require('./collectionPreReq.json'),
    //reporters: 'cli',
    environment: require('./Environment.json'),
    insecure: true
}).on('start', function (err, args) {
    console.log('running a collection...');
}).on('done', function (err, summary) {
    if (err || summary.error) {
        console.error('collection run encountered an error.');
    }
    else {
        console.log('collection run completed.:');
        console.log("summary environment :");
        console.log(summary.environment);
    }
});

Output:

running a collection...
collection run completed.:
summary environment :
{ object: [Function], toJSON: [Function] }

Answer 1

Please try to use this newman option exportEnvironment: require('./Environment.json') in the javascript file like

newman.run({
   collection: require('./collectionPreReq.json'),
   //reporters: 'cli',
   environment: require('./Environment.json'),
   exportEnvironment: require('./Environment.json'),
   insecure: true 
})....

Surely, This statement will work.