babel-core/bin/babel/index.js

Turn ES6 code into readable vanilla ES5 with source maps

#!/usr/bin/env node

var commander = require("commander");
var transform = require("../../lib/babel/transformation");
var util      = require("../../lib/babel/util");
var fs        = require("fs");
var each      = require("lodash/collection/each");
var keys      = require("lodash/object/keys");

commander.option("-t, --source-maps-inline", "Append sourceMappingURL comment to bottom of code");
commander.option("-s, --source-maps", "Save source map alongside the compiled code");
commander.option("-f, --filename [filename]", "Filename to use when reading from stdin - this will be used in source-maps, errors etc [stdin]", "stdin");
commander.option("-w, --watch", "Recompile files on changes");
commander.option("-r, --external-helpers", "Replace helpers with references to a `babelHelpers` global");
commander.option("-e, --experimental", "Enable experimental support for proposed ES7 features");
commander.option("-p, --playground", "Enable playground support");

commander.option("-m, --modules [modules]", "Module formatter type to use [common]", "common");
commander.option("-l, --whitelist [whitelist]", "Whitelist of transformers to ONLY use", util.list);
commander.option("-b, --blacklist [blacklist]", "Blacklist of transformers to NOT use", util.list);
commander.option("-i, --optional [list]", "List of optional transformers to enable", util.list);
commander.option("-L, --loose [list]", "List of transformers to enable loose mode ON", util.list);
commander.option("-o, --out-file [out]", "Compile all input files into a single file");
commander.option("-d, --out-dir [out]", "Compile an input directory of modules into an output directory");
commander.option("-c, --remove-comments", "Remove comments from the compiled code", false);
commander.option("-M, --module-ids", "Insert module id in modules", false);
commander.option("-R, --react-compat", "Makes the react transformer produce pre-v0.12 code");
commander.option("--keep-module-id-extensions", "Keep extensions when generating module ids", false);
commander.option("-a, --auxiliary-comment [comment]", "Comment text to prepend to all auxiliary code");

commander.on("--help", function () {
  var outKeys = function (title, obj) {
    console.log("  " + title + ":");
    console.log();

    each(keys(obj).sort(), function (key) {
      if (key[0] === "_") return;

      if (obj[key].optional) {
        key = "[" + key + "]";
      }

      console.log("    - " + key);
    });

    console.log();
  };

  outKeys("Transformers", transform.transformers);
  outKeys("Module formatters", transform.moduleFormatters);
});

var pkg = require("../../package.json");
commander.version(pkg.version);
commander.usage("[options] <files ...>");
commander.parse(process.argv);

//

var errors = [];

var filenames = commander.args;

each(filenames, function (filename) {
  if (!fs.existsSync(filename)) {
    errors.push(filename + " doesn't exist");
  }
});

if (commander.outDir && !filenames.length) {
  errors.push("filenames required for --out-dir");
}

if (commander.outFile && commander.outDir) {
  errors.push("cannot have --out-file and --out-dir");
}

if (commander.watch) {
  if (!commander.outFile && !commander.outDir) {
    errors.push("--watch requires --out-file or --out-dir");
  }

  if (!filenames.length) {
    errors.push("--watch requires filenames");
  }
}

if (commander.sourceMaps) {
  if (!commander.outFile && !commander.outDir) {
    errors.push("--source-maps requires --out-file or --out-dir");
  }
}

if (errors.length) {
  console.error(errors.join(". "));
  process.exit(2);
}

//

exports.opts = {
  keepModuleIdExtensions: commander.keepModuleIdExtensions,
  auxiliaryComment:       commander.auxiliaryComment,
  externalHelpers:        commander.externalHelpers,
  sourceMapName:          commander.outFile,
  experimental:           commander.experimental,
  reactCompat:            commander.reactCompat,
  playground:             commander.playground,
  moduleIds:              commander.moduleIds,
  blacklist:              commander.blacklist,
  whitelist:              commander.whitelist,
  sourceMap:              commander.sourceMaps || commander.sourceMapsInline,
  optional:               commander.optional,
  comments:               !commander.removeComments,
  modules:                commander.modules,
  loose:                  commander.loose
};

setTimeout(function () {
  // this is just a hack to give `babel-minify` and other files including this
  // time to modify `exports.opts`

  var fn;

  if (commander.outDir) {
    fn = require("./dir");
  } else {
    fn = require("./file");
  }

  fn(commander, filenames, exports.opts);
}, 0);