#!/usr/bin/env node
// -*- mode: js -*-
// vim: set ft=javascript :

'use strict';

var babel = require('babel');

var devExpressionPlugin = require('fbjs/scripts/babel/dev-expression');

var TRANSFORM_IGNORE_RE = /^WebComponents$/;

require('commoner').version(
  require('../package.json').version
).resolve(function(id) {
  var context = this;

  // Note that the result of context.getProvidedP() is cached for the
  // duration of the build, so it is both consistent and cheap to
  // evaluate multiple times.
  return context.getProvidedP().then(function(idToPath) {
    // If a module declares its own identifier using @providesModule
    // then that identifier will be a key in the idToPath object.
    if (idToPath.hasOwnProperty(id)) {
      return context.readFileP(idToPath[id]);
    }

    // Otherwise assume the identifier maps directly to a path in the
    // filesystem.
    return context.readModuleP(id);
  });

}).process(function(id, source) {
  var context = this;

  // This is hacky but that's ok… It really only matters for tests since it
  // won't otherwise be in the dependency tree.
  if (!TRANSFORM_IGNORE_RE.test(id)) {
    // This is where JSX, ES6, etc. desugaring happens.
    source = babel.transform(source, {
      blacklist: ['spec.functionName', 'validation.react'],
      plugins: [devExpressionPlugin],
      filename: id,
    }).code;
  }

  return source;
});