How do I run doiuse purely in node? [documentation] about doiuse HOT 6 CLOSED

var fs = require('fs')
var doiuse = require('doiuse/stream');

fs.createReadStream('/path/to/your/file.css')
  .pipe(doiuse(['ie >= 8', '> 1%']))
  .on('data', function(usageInfo) {
     console.log(usageInfo.message)
   }

var fs= require('fs')
var postcss = require('postcss')
var doiuse = require('doiuse')

postcss(doiuse({
    browsers:['ie >= 6', '> 1%'],
    onFeatureUsage: function(usageInfo) {
        console.log(usageInfo.message);
    }
}))
.process(fs.readFileSync('/path/to/your.css')

var fs = require('fs');
var doiuse = require('doiuse');

var sourceFile = 'test/fixtures/backgrounds.css';
var OPTIONS = [];
OPTIONS.browsers = [ '> 1%', 'last 2 versions', 'Firefox ESR', 'Opera 12.1' ];

fs
    .createReadStream( sourceFile )
    .pipe( doiuse( OPTIONS.browsers ) )
    .on('data', function( usageInfo ) {
        console.log(usageInfo.message)
    });

var doiuse = require('doiuse/stream');