Gruntfile.js

/**
 * Grunt build file for Doppio.
 * Bootstraps ourselves from JavaScript into TypeScript.
 */
var Grunttasks, glob = require('glob'), ts_files = [], ts_files_to_compile = [],
    execSync = require('execSync'),
    fs = require('fs'),
    path = require('path'),
    ts_path = path.resolve('node_modules', '.bin', 'tsc'),
    result;

/**
 * For a given TypeScript file, checks if we should recompile it based on
 * modification time.
 */
function shouldRecompile(file) {
  var jsFile = file.split(0, -2) + '.js';
  // Recompile if a JS version doesn't exist, OR if the TS version has a
  // greater modification time.
  return !fs.existsSync(jsFile) || fs.statSync(file) > fs.statSync(jsFile);
}

ts_files = glob.sync('tasks/*.ts');
ts_files.push('Grunttasks.ts');

// Node glob returns *nix-style path separators.
// Let's resolve every path to convert to the current system's
// separators.
ts_files.forEach(function(e, i) {
  e = path.resolve(e);
  if (shouldRecompile(e)) ts_files_to_compile.push(e);
});

// Run!
result = execSync.exec(ts_path + ' --noImplicitAny --module commonjs ' + ts_files_to_compile.join(' '));
if (result.code !== 0) {
  throw new Error("Compilation error: " + result.stdout + "\n" + result.stderr);
}

Grunttasks = require('./Grunttasks');
module.exports = Grunttasks.setup;