Many data sources to one template

many-to-one-gulpfile.js

var gulp = require('gulp');
var hb = require('gulp-hb');
var rename = require('gulp-rename');
var through = require('through2');

gulp.task('build', function () {
    return gulp
        .src('./data/**/*.json')
        .pipe(through.obj(function(file, enc, cb) {
            var data = JSON.parse(String(file.contents));
            file.contents = new Buffer('{{> template file.data}}');
            file.data = data;
            cb(null, file);
        }))
        .pipe(hb({
            partials: './template.hbs'
        }))
        .pipe(rename({
            extname: '.html'
        }));
});