text: var fs = require("fs");
  
  exports.FILES = [
      // "../lib/utils.js",
      // "../lib/ast.js",
      // "../lib/parse.js",
      // "../lib/transform.js",
      // "../lib/scope.js",
      // "../lib/output.js",
      // "../lib/compress.js",
      // "../lib/sourcemap.js",
      // "../lib/mozilla-ast.js",
      // "../lib/propmangle.js",
      // "../lib/minify.js",
      // "./exports.js",
  ].map(function(file) {
      return require.resolve(file);
  });
  
  new Function("MOZ_SourceMap", "exports", function() {
      var code = exports.FILES.map(function(file) {
          return fs.readFileSync(file, "utf8");
      });
      code.push("exports.describe_ast = " + describe_ast.toString());
      return code.join("\n\n");
  }())(require("source-map"), exports);
  
  function describe_ast() {
      var out = OutputStream({ beautify: true });
      function doitem(ctor) {
          out.print("AST_" + ctor.TYPE);
          var props = ctor.SELF_PROPS.filter(function(prop) {
              return !/^\$/.test(prop);
          });
          if (props.length > 0) {
              out.space();
              out.with_parens(function() {
                  props.forEach(function(prop, i) {
                      if (i) out.space();
                      out.print(prop);
                  });
              });
          }
          if (ctor.documentation) {
              out.space();
              out.print_string(ctor.documentation);
          }
          if (ctor.SUBCLASSES.length > 0) {
              out.space();
              out.with_block(function() {
                  ctor.SUBCLASSES.forEach(function(ctor, i) {
                      out.indent();
                      doitem(ctor);
                      out.newline();
                  });
              });
          }
      };
      doitem(AST_Node);
      return out + "\n";
  }
  
  function infer_options(options) {
      var result = exports.minify("", options);
      return result.error && result.error.defs;
  }
  
  exports.default_options = function() {
      var defs = {};
      Object.keys(infer_options({ 0: 0 })).forEach(function(component) {
          var options = {};
          options[component] = { 0: 0 };
          if (options = infer_options(options)) {
              defs[component] = options;
          }
      });
      return defs;
  };
  