add back runtime - fixes #651

lib/6to5/build-helpers.js

@@ -0,0 +1,13 @@
+var File = require("./file");
+var util = require("./util");
+var each = require("lodash/collection/each");
+var t    = require("./types");
+
+module.exports = function (body, namespace) {
+  each(File.helpers, function (name) {
+    var key = t.identifier(t.toIdentifier(name));
+    body.push(t.expressionStatement(
+      t.assignmentExpression("=", t.memberExpression(namespace, key), util.template(name))
+    ));
+  });
+};

lib/6to5/build-runtime.js

@@ -0,0 +1,26 @@
+"use strict";
+
+var buildHelpers = require("./build-helpers");
+var generator    = require("./generation");
+var util         = require("./util");
+var t            = require("./types");
+var _            = require("lodash");
+
+module.exports = function () {
+  var namespace = t.identifier("to5Runtime");
+
+  var body      = [];
+  var container = t.functionExpression(null, [t.identifier("global")], t.blockStatement(body));
+  var tree      = t.program([t.expressionStatement(t.callExpression(container, [util.template("self-global")]))]);
+
+  body.push(t.variableDeclaration("var", [
+    t.variableDeclarator(
+      namespace,
+      t.assignmentExpression("=", t.memberExpression(t.identifier("global"), namespace), t.objectExpression([]))
+    )
+  ]));
+
+  buildHelpers(body, namespace);
+
+  return generator(tree).code;
+};

lib/6to5/file.js

@@ -24,7 +24,7 @@ function File(opts) {
   this.data             = {};
 
   this.lastStatements   = [];
-  this.opts             = File.normaliseOptions(opts);
+  this.opts             = this.normaliseOptions(opts);
   this.ast              = {};
 
   this.buildTransformers();
@@ -76,6 +76,7 @@ File.validOptions = [
   "playground",
   "experimental",
   "resolveModuleSource",
+  "runtime",
 
   // these are used by plugins
   "ignore",
@@ -84,7 +85,7 @@ File.validOptions = [
   "accept"
 ];
 
-File.normaliseOptions = function (opts) {
+File.prototype.normaliseOptions = function (opts) {
   opts = clone(opts);
 
   for (var key in opts) {
@@ -108,6 +109,7 @@ File.normaliseOptions = function (opts) {
     comments:               true,
     filename:               "unknown",
     modules:                "common",
+    runtime:                false,
     loose:                  [],
     code:                   true,
     ast:                    true
@@ -146,6 +148,10 @@ File.normaliseOptions = function (opts) {
     opts.experimental = true;
   }
 
+  if (opts.runtime) {
+    this.set("runtimeIdentifier", t.identifier("to5Runtime"));
+  }
+
   opts.blacklist = transform._ensureTransformerNames("blacklist", opts.blacklist);
   opts.whitelist = transform._ensureTransformerNames("whitelist", opts.whitelist);
   opts.optional = transform._ensureTransformerNames("optional", opts.optional);

lib/6to5/generation/index.js

@@ -40,9 +40,11 @@ each(Buffer.prototype, function (fn, key) {
 });
 
 CodeGenerator.normaliseOptions = function (code, opts) {
-  var indent = detectIndent(code);
-  var style  = indent.indent;
-  if (!style || style === " ") style = "  ";
+  var style = "  ";
+  if (code) {
+    var style = detectIndent(code).indent;
+    if (style && style !== " ") style = "  ";
+  }
 
   return merge({
     parentheses: true,

lib/6to5/index.js

@@ -7,6 +7,8 @@ var isFunction = require("lodash/lang/isFunction");
 
 exports.version = require("../../package").version;
 
+exports.runtime = require("./build-runtime");
+
 exports.types = require("./types");
 
 exports.register = function (opts) {