* Deconflict named imports from external modules in ES bundles ([#659](https://github.com/rollup/rollup/issues/659))
* Support `options.preferConst` to generate `const` declarations for exports rather than `var` declarations ([#653](https://github.com/rollup/rollup/issues/653))
* Prevent double export of aliased symbols ([#438](https://github.com/rollup/rollup/issues/438))
* Provide more informative error if Rollup is used in-browser without appropriate `resolveId`/`load` hooks ([#275](https://github.com/rollup/rollup/issues/275))
* Use `_interopDefault` function to DRY out code with many external dependencies, in CommonJS output ([#458](https://github.com/rollup/rollup/pull/458))
* **breaking** Module order is determined according to spec, rather than in a way designed to prevent runtime errors. Rollup will warn if it detects runtime errors are likely ([#435](https://github.com/rollup/rollup/issues/435))
* Prevent overly aggressive tree-shaking with complex call expressions ([#440](https://github.com/rollup/rollup/issues/440))
* Handle calls to default exports other that are not function expressions or references to function declarations ([#421](https://github.com/rollup/rollup/issues/421))
* Ensure namespace blocks are created for chained imports ([#430](https://github.com/rollup/rollup/issues/430))
* Include references in computed property keys ([#434](https://github.com/rollup/rollup/issues/434))
* Use CLI `--external` option correctly ([#417](https://github.com/rollup/rollup/pull/417))
* Allow relative imports to be treated as external, if absolute paths are provided in `options.external` ([#410](https://github.com/rollup/rollup/issues/410))
* Make IIFE output adhere to Crockford style ([#415](https://github.com/rollup/rollup/pull/415))
* Only include statements whose side-effects are relevant (i.e. contribute to exports or affect global state) ([#253](https://github.com/rollup/rollup/pull/253)) ([#253](https://github.com/rollup/rollup/pull/253))
* Exclude dead branches from analysis and inclusion ([#249](https://github.com/rollup/rollup/pull/249))
* Add `aggressive: true` option to eliminate all side-effects outside entry module
* More informative error when re-exporting non-existent binding ([#274](https://github.com/rollup/rollup/issues/274))
* Support for [plugins](https://github.com/rollup/rollup/wiki/Plugins) ([#207](https://github.com/rollup/rollup/pulls/207))
* BREAKING – `options.transform`, `options.load`, `options.resolveId`, `options.resolveExternal` and `options.external` are no longer supported, and should be handled by plugins. [More info](https://github.com/rollup/rollup/wiki/Plugins)
* BREAKING – the .js extension is only added if it looks like there's no extension, allowing e.g. `import data from 'data.json'` (with the appropriate transformer). For safety, always include the file extension – import `./foo.js`, not `./foo`
* Fix exporting namespaces to include all of their exports ([#204](https://github.com/rollup/rollup/issues/204))
* Namespace exotic objects are frozen to ensure that its properties cannot be modified, reconfigured, redefined or deleted ([#203](https://github.com/rollup/rollup/pulls/203))
* Fix `ReferenceError: Promise is not defined` in node v0.10 ([#189](https://github.com/rollup/rollup/issues/189))
* **breaking** The `transform` option is no longer passed through to custom loaders. Loaders should only concern themselves with providing source code; transformation will *always* take place
*`options.transform` functions can return a string, or a `{code, map, ast}` object. Where possible, sourcemap chains will be flattened ([#175](https://github.com/rollup/rollup/pull/175))
*`options.resolveId`, `options.resolveExternal` and `options.load` can each be a function or an array of functions. If an array, the first non-null/undefined return value is used. In both cases, failed resolution/loading will fall back to the defaults, unless an error is thrown. ([#174](https://github.com/rollup/rollup/pull/174))
* New `intro` and `outro` options – similar to `banner` and `footer` except inserted *inside* any format-specific wrapper
* Multiple var declarations in an export block (e.g. `export let a = 1, b = 2`) are split up to facilitate tree-shaking ([#171](https://github.com/rollup/rollup/issues/171))
* More informative error when using a missing namespace property ([#169](https://github.com/rollup/rollup/pull/169))
* Load all modules specified by `import` statements, and do tree-shaking synchronously once loading is complete. This results in simpler and faster code, and enables future improvements ([#97](https://github.com/rollup/rollup/pull/97))
* Only rewrite `foo` as `exports.foo` when it makes sense to ([#92](https://github.com/rollup/rollup/issues/92))
* Fix bug with shadowed variables that are eventually exported ([#91](https://github.com/rollup/rollup/issues/91))
* Exclude unused function declarations that happen to modify a used name ([#90](https://github.com/rollup/rollup/pull/90))
* Simplify internal `Scope` model – scopes always attach to blocks, never function expressions/declarations
* BREAKING - `resolvePath` is now `resolveId`. The returned `id` (which by default is a filepath) is passed to the `load` function, which can optionally be overridden, and which is applied to all modules including the entry module. This allows custom resolver and loading logic for integration with third party systems (e.g. JSPM) or, eventually, in-browser usage ([#30](https://github.com/rollup/rollup/issues/30))
* A statement cannot appear after later statements from the same bundle ([#34](https://github.com/rollup/rollup/issues/34))
* Tricky cyclical dependencies are handled ([#36](https://github.com/rollup/rollup/issues/36))
*`sourcemap` option is used by CLI (was omitted previously)
* Anonymous functions that are exported as default are converted to named function declarations for correct hoisting, rather than being bound to functions ([#29](https://github.com/rollup/rollup/issues/29))
* Automatically-generated default export names are deconflicted with local definitions ([#29](https://github.com/rollup/rollup/issues/29))
* Top-level variable declarations with multiple declarators are split up, to avoid unnecessary code importing and incorrectly-ordered statements ([#26](https://github.com/rollup/rollup/issues/26))
*`this` at the top level is `undefined` ([#28](https://github.com/rollup/rollup/issues/28))
* Default exports are not bound. To enable this, statements within a module are sorted to retain their original order ([#15](https://github.com/rollup/rollup/issues/15))
* Better positioning of comments ([#14](https://github.com/rollup/rollup/issues/14))
* Named functions can be used as default exports from a bundle
* Method calls are assumed to mutate the owner (i.e. `foo.bar()` mutates `foo`) ([#13](https://github.com/rollup/rollup/issues/13))
*`options.indent` can be used to control indentation of resulting bundle. `options.true` (default) means 'auto', `options.false` means empty string. Alternatively specify whitespace e.g. `' '` or `'\t'` ([#5](https://github.com/rollup/rollup/issues/5))
* Fix exports and external module imports with some output formats
* Fix endless cycle bug on Windows ([#3](https://github.com/rollup/rollup/pull/3)) - thanks @Bobris
## 0.6.2
* Permit assignments to properties of imported bindings
## 0.6.1
* Support for basic transformers
## 0.6.0
* BREAKING - `rollup.rollup` and `bundle.write` both take a single options argument
* BREAKING - external modules must be declared upfront with `options.external: [...]`
* Non-relative module paths will be resolved by looking for `jsnext:main` fields in the appropriate `package.json` files. This behaviour can be overridden by passing an alternative `resolveExternal` function
