rollup/CHANGELOG.md

Next-generation ES module bundler

# rollup changelog

## 2.27.1
*2020-09-17*

### Bug Fixes
* Do not fail when using ES module imports in symlinked config files (#3783)

### Pull Requests
* [#3783](https://github.com/rollup/rollup/pull/3783): Handle loading symlinked config files (@lukastaegert)

## 2.27.0
*2020-09-16*

### Features
* Support specifying a file extension when reading from stdin (#3775)

### Bug Fixes
* Do not break logic if a branch with hoisted variables is tree-shaken in an else-if statement (#3782)

### Pull Requests
* [#3770](https://github.com/rollup/rollup/pull/3770): Docs: Exception for babel plugin and commonjs plugin (@jsk7)
* [#3775](https://github.com/rollup/rollup/pull/3775): add ability to specify stdin file extension via --stdin=ext (@kzc)
* [#3782](https://github.com/rollup/rollup/pull/3782): Handle hoisted variables in dead branches of nested if statements (@lukastaegert)

## 2.26.11
*2020-09-08*

### Bug Fixes
* Do not fail for unknown nodes as if statement branches (#3769)

### Pull Requests
* [#3769](https://github.com/rollup/rollup/pull/3769): Handle debugger statements as if-statement branches (@lukastaegert)

## 2.26.10
*2020-09-04*

### Bug Fixes
* Do not create invalid code when simplifying expressions in return statements that contain line comments (#3762)

### Pull Requests
* [#3757](https://github.com/rollup/rollup/pull/3757): Fix api docs loadconfigfile (@maxwell8888)
* [#3762](https://github.com/rollup/rollup/pull/3762): Handle line-comments when removing line-breaks to prevent ASI (@lukastaegert)

## 2.26.9
*2020-09-01*

### Bug Fixes
* Add regular expression support to watch include/exclude types (#3754)

### Pull Requests
* [#3754](https://github.com/rollup/rollup/pull/3754): Add RegExp to the include and exclude fields of the WatcherOptions type (@dagda1)
* [#3756](https://github.com/rollup/rollup/pull/3756): Update FAQ: I think it was meant "external" instead of "other-entry.js" (@madacol)

## 2.26.8
*2020-08-29*

### Bug Fixes
* Make sure that both unresolved and resolved ids are passed to the `external` option in all cases (#3753)

### Pull Requests
* [#3753](https://github.com/rollup/rollup/pull/3753): Also pass resolved ids to external if they use the object for (@lukastaegert)

## 2.26.7
*2020-08-28*

### Bug Fixes
* Avoid invalid code when rendering hoisted variable declarations from dead branches (#3752)
* Mark the `options` parameter of `this.parse` as optional for TypeScript plugins (#3750)

### Pull Requests
* [#3750](https://github.com/rollup/rollup/pull/3750): Make `options` of `PluginContext#parse` optional (@intrnl)
* [#3752](https://github.com/rollup/rollup/pull/3752): Extract hoisted variables from dead branches (@lukastaegert)

## 2.26.6
*2020-08-27*

### Bug Fixes
* Avoid conflicts between the namespace of synthetic named exports and local variables (#3747)

### Pull Requests
* [#3747](https://github.com/rollup/rollup/pull/3747): Properly deconflict synthetic named exports (@lukastaegert)

## 2.26.5
*2020-08-22*

### Bug Fixes
* Use correctly deconflicted variable names for reexported namespaces in ES formats (#3742)

### Pull Requests
* [#3742](https://github.com/rollup/rollup/pull/3742): Avoid variable name conflict when reexporting several namespaces from a chunk (@lukastaegert)

## 2.26.4
*2020-08-19*

### Bug Fixes
* Fix a situation where invalid code was rendered when dynamically importing a module with synthetic named exports when preserving modules (#3738)
* Create a proper namespace object when in a non-es format, a namespace is imported from a chunk with `default` export mode (#3738)
* Use the same variable when in a chunk, a namespace is both imported and reexported as a binding (#3738)
* Do not include the synthetic namespace in static entry points unless it is actually used (#3738)
* Make sure the chunking of one output does not interfere with the namespace objects of another output (#3738)

### Pull Requests
* [#3738](https://github.com/rollup/rollup/pull/3738): Improve synthetic entry handling (@lukastaegert)

## 2.26.3
*2020-08-16*

### Bug Fixes
* Fix a situation where line-breaks in a nested simplified conditional expression could result in broken code (#3734)

### Pull Requests
* [#3734](https://github.com/rollup/rollup/pull/3734): Prevent ASI when simplifying a nested logical expression (@lukastaegert)

## 2.26.2
*2020-08-16*

### Bug Fixes
* Fix a situation where line-breaks in a simplified conditional expression could result in broken code (#3732)

### Pull Requests
* [#3732](https://github.com/rollup/rollup/pull/3732): Prevent unintended ASI for nested conditionals (@lukastaegert)

## 2.26.1
*2020-08-16*

### Bug Fixes
* Correctly render external namespace imports when only generating SystemJS output (#3731)

### Pull Requests
* [#3731](https://github.com/rollup/rollup/pull/3731): Render system namespace import (@sastan and @lukastaegert)

## 2.26.0
*2020-08-15*

### Features
* Add a new entry `importedBindings` to the bundle information to list bindings per dependency (#3722)

### Bug Fixes
* Do not render an invalid UMD wrapper when no bindings are imported from a dependency (#3724)
* Avoid situations where removing the `else` branch from an `if` statement might catch the `else` branch from another one (#3725)

### Pull Requests
* [#3722](https://github.com/rollup/rollup/pull/3722): Add import specifiers to bundle information (@lukastaegert)
* [#3724](https://github.com/rollup/rollup/pull/3724): Fix missing variables for UMD and IIFE builds (@lukastaegert)
* [#3725](https://github.com/rollup/rollup/pull/3725): Do not entirely remove else branch if another else branch might accidentally be referenced (@lukastaegert)

## 2.25.0
*2020-08-14*

### Features
* Add `--failAfterWarnings` CLI flag that will complete builds with warnings but return an error at the end (#3712)

### Pull Requests
* [#3712](https://github.com/rollup/rollup/pull/3712): Implement `--failAfterWarnings` flag (@tjenkinson)

## 2.24.0
*2020-08-13*

### Features
* Allow defining interop per dependency via a function (#3710)
* Support interop "auto" as a more compatible version of "true" (#3710)
* Support interop "default" and "esModule" to avoid unnecessary interop helpers (#3710)
* Support interop "defaultOnly" for simplified helpers and Node ESM interop compatible output (#3710)
* Respect interop option for external dynamic imports (#3710)
* Support live-bindings for external default imports in non-ES formats unless "externalLiveBindings" is "false" (#3710)
* Use shared default interop helpers for AMD, UMD and IIFE formats (#3710)
* Avoid unnecessarily deconflicted module variables in non-ES formats (#3710)
* Freeze generated interop namespace objects (#3710)
* Always mark interop helpers as pure (#3710)
* Avoid default export interop if there is already an interop namespace object (#3710)
* Sort all `require` statements to the top in CommonJS output for easier back-transpilation to ES modules by other tools (#3710)

### Bug Fixes
* Handle accessing `super` in static class fields (#3720)
* Deconflict the names of helper variables introduced for interop (#3710)
* Generate proper namespace objects for static namespace imports in non-ES formats (#3710)
* Do not add unused interop helpers when using the renderDynamicImport hook (#3710)

### Pull Requests
* [#3710](https://github.com/rollup/rollup/pull/3710): Rework interop handling (@lukastaegert)
* [#3720](https://github.com/rollup/rollup/pull/3720): Handle super in static class fields (@lukastaegert)

## 2.23.1
*2020-08-07*

### Bug Fixes
* Fix an issue where dynamically importing an entry point could return a malformed namespace for CJS and AMD formats (#3709)

### Pull Requests
* [#3709](https://github.com/rollup/rollup/pull/3709): Properly construct namespace when dynamically importing chunks with facades in default export mode (@lukastaegert)

## 2.23.0
*2020-07-23*

### Features
* Handle environments with only globalThis in UMD output (#3691)

### Pull Requests
* [#3691](https://github.com/rollup/rollup/pull/3691): Check for globalThis in UMD wrapper (@lukastaegert)

## 2.22.2
*2020-07-21*

### Bug Fixes
* Always generate correct exports when an implicit entry is reexporting from another module (#3688)

### Pull Requests
* [#3688](https://github.com/rollup/rollup/pull/3688): Include all relevant modules to generate reexports for implicit dependencies (@lukastaegert)

## 2.22.1
*2020-07-18*

### Bug Fixes
* Remove unused arguments when calling a conditional expression (#3680)

### Pull Requests
* [#3680](https://github.com/rollup/rollup/pull/3680): Allow tree-shaking of arguments of functions that are returned by conditional expressions (@lukastaegert)

## 2.22.0
*2020-07-18*

### Features
* Allow resolving synthetic named exports via an arbitrary export name (#3657)
* Display a warning when the user does not explicitly select an export mode and would generate a chunk with default export mode when targeting CommonJS (#3657)

### Pull Requests
* [#3657](https://github.com/rollup/rollup/pull/3657): Add basic support for using a non-default export for syntheticNamedExports (@lukastaegert)
* [#3659](https://github.com/rollup/rollup/pull/3659): Warn when implicitly using default export mode (@lukastaegert)

## 2.21.0
*2020-07-07*

### Features
* Allow plugins to disable tree-shaking for individual modules to ensure even empty modules are associated with chunks (#3663)

### Pull Requests
* [#3663](https://github.com/rollup/rollup/pull/3663): Disable treeshaking per module (@lukastaegert)

## 2.20.0
*2020-07-06*

### Features
* Support using a function to generate different chunk and asset naming patterns per chunk or asset (#3658)
* Add `referencedFiles` property to the chunk info in generateBundle to list referenced assets (#3661)

### Pull Requests
* [#3658](https://github.com/rollup/rollup/pull/3658): Add ability to use a function that returns a pattern string in all places where you could use a pattern string before (@frank-dspeed)
* [#3661](https://github.com/rollup/rollup/pull/3661): Add referenced files to bundle (@lukastaegert)

## 2.19.0
*2020-07-05*

### Features
* Allow plugins to return a Promise in the options hook (#3660)

### Pull Requests
* [#3660](https://github.com/rollup/rollup/pull/3660): Make options hooks async (@TomerAberbach)

## 2.18.2
*2020-07-02*

### Bug Fixes
* Do not remove spread element args when the corresponding positional parameter is unused (#3652)

### Pull Requests
* [#3652](https://github.com/rollup/rollup/pull/3652): Do not tree-shake arguments that contain a spread element (@lukastaegert)

## 2.18.1
*2020-06-26*

### Bug Fixes
* Make sure synthetic exports are present when a module is imported dynamically (#3648)
* Strip the `rollup-plugin-` prefix off the plugin name when looking for the plugin export in a CLI plugin without a default export (#3647)
* Convert plugin names with dashes to camel case when looking for the plugin export in a CLI plugin without a default export (#3647)

### Pull Requests
* [#3647](https://github.com/rollup/rollup/pull/3647): Strip rollup-plugin prefix to find named plugin exports, throw when export cannot be found (@lukastaegert)
* [#3648](https://github.com/rollup/rollup/pull/3648): Always create a dynamic namespace object when a module with synthetic named exports is imported dynamically (@lukastaegert)

## 2.18.0
*2020-06-22*

### Features
* `inlineDynamicImports`, `manualChunks` and `preserveModules` can now be used as output options (#3645)
* Use sourcemaps for certain warnings that reference source code locations (#3645)

### Bug Fixes
* `this.getFileName` will now always return the correct file name for chunks when multiple outputs are created (#3645)

### Pull Requests
* [#3645](https://github.com/rollup/rollup/pull/3645): Per output chunking (@lukastaegert)

## 2.17.1
*2020-06-19*

### Bug Fixes
* Properly resolve accessing properties of namespace members again (#3643)

### Pull Requests
* [#3643](https://github.com/rollup/rollup/pull/3643): Fix accessing nested properties of namespaces (@lukastaegert)

## 2.17.0
*2020-06-17*

### Features
* When importing Rollup via package.exports, always fall back to the browser ESM build for non-Node environments (#3634)
* Create more efficient code when handling namespace mutations (#3637)

### Bug Fixes
* Fix a severe performance regression when the same module is imported by a lot of modules (#3641)
* Properly escape special characters in imports (#3638)

### Pull Requests
* [#3634](https://github.com/rollup/rollup/pull/3634): Set browser build in exports (@guybedford)
* [#3637](https://github.com/rollup/rollup/pull/3637): Do not include the whole namespace when illegally mutating a namespace (@lukastaegert)
* [#3638](https://github.com/rollup/rollup/pull/3638): Support backslash escaping, retain exact newline escaping (@guybedford)
* [#3641](https://github.com/rollup/rollup/pull/3641): Fix performance regression when a file is imported by many importers (@lukastaegert)

## 2.16.1
*2020-06-13*

### Bug Fixes
* Do not produce invalid code when an external or chunk id contain quotes or line-breaks (#3632)
* Do not fail but emit a warning when mutating a namespace object (#3633)

### Pull Requests
* [#3632](https://github.com/rollup/rollup/pull/3632): Handle single quote escaping in ids (@guybedford)
* [#3633](https://github.com/rollup/rollup/pull/3633): Turn namespace assignment error into a warning (@guybedford)

## 2.16.0
*2020-06-12*

### Features
* Add support for numeric separators (#3626)
* Switch to finalized ESTree optional chaining AST (#3628)

### Pull Requests
* [#3626](https://github.com/rollup/rollup/pull/3626): Support numeric separator (@TrySound)
* [#3628](https://github.com/rollup/rollup/pull/3628): Acorn 7.3.0 upgrade (@guybedford)
* [#3631](https://github.com/rollup/rollup/pull/3631): Improve discoverability of `manualChunks` for code splitting (@zlamma)

## 2.15.0
*2020-06-08*

### Features
* Allow to skip watching some configs via `watch: false` (#3620)
* Provide the resolved sourcemap path to `sourcemapPathTransform` (#3617)

### Pull Requests
* [#3617](https://github.com/rollup/rollup/pull/3617): Update sourcemapPathTransform to also take the path to the sourcemap file as a second argument (@dgoldstein0)
* [#3620](https://github.com/rollup/rollup/pull/3620): Rollup watch only one config in exported array (@luwol03)

## 2.14.0
*2020-06-07*

### Features
* Make `this.meta.watchMode` available for plugins to detect watch mode (#3616)

### Bug Fixes
* Handle exporting the same binding with different names in SystemJS (#3575)

### Pull Requests
* [#3575](https://github.com/rollup/rollup/pull/3575): Handle some cases of duplicate export bindings (@joeljeske)
* [#3616](https://github.com/rollup/rollup/pull/3616): Make watch mode available in plugins (@lukastaegert)

## 2.13.1
*2020-06-04*

### Bug Fixes
* Prevent conflicts in SystemJS when `module` is used as a top-level variable (#3614)

### Pull Requests
* [#3614](https://github.com/rollup/rollup/pull/3614): Handle system reserved identifier dedupes (@guybedford)

## 2.13.0
*2020-06-03*

### Features
* Allow to specify that an emitted chunk is only loaded after a given module has loaded to improve chunking (#3606)

### Pull Requests
* [#3606](https://github.com/rollup/rollup/pull/3606): Enable specifying implicit dependencies when emitting chunks (@lukastaegert)

## 2.12.1
*2020-06-02*

### Bug Fixes
* Render valid imports when chunk names correspond to directory names in virtual setups (#3609)

### Pull Requests
* [#3609](https://github.com/rollup/rollup/pull/3609): Handle imports from chunks with names that correspond to parent directory names of other chunks (@guybedford)

## 2.12.0
*2020-05-31*

### Features
* Add an option `--waitForBundleInput` to let the build wait until all entry point files are available before starting (#3577)

### Pull Requests
* [#3577](https://github.com/rollup/rollup/pull/3577): Wait for bundle input option (@Heerschop)

## 2.11.2
*2020-05-28*

### Bug Fixes
* Include side-effects in the second argument of `Array.from` (#3604)

### Pull Requests
* [#3604](https://github.com/rollup/rollup/pull/3604): Mark `Array.from` as side-effectful, use two-argument Array.from when mapping Sets (@lukastaegert)

## 2.11.1
*2020-05-28*

### Bug Fixes
* Also include side-effects in files that are marked as side-effect-free if they contain an included default export that is reexported (#3602)

### Pull Requests
* [#3602](https://github.com/rollup/rollup/pull/3602): Handle side-effects next to side-effect-free default exports in case the default export is reexported (@lukastaegert)

## 2.11.0
*2020-05-27*

### Features
* Add basic support for optional chaining (#3582)
* Provide a normalized set of options with proper default values to `buildStart` and `renderStart` (#3597)
* Do not count adding properties to the prototype of an unused class as a side-effect (#3598)
* Support providing `null` for empty setters in SystemJS via option (#3592)

### Bug Fixes
* Do not fail when using a `/*#__PURE__*/` annotation inside a class field (#3599)
* Allow using `--watch` and `--treeshake` together with sub-options such as `--watch.clearScreen` on the command line (#3597)

### Pull Requests
* [#3582](https://github.com/rollup/rollup/pull/3582): Support optional chaining via acorn fork(@guybedford)
* [#3592](https://github.com/rollup/rollup/pull/3592): System format optional setters(@guybedford)
* [#3597](https://github.com/rollup/rollup/pull/3597): Provide normalized options (@lukastaegert)
* [#3598](https://github.com/rollup/rollup/pull/3598): Treeshake prototype modifications in classes (@lukastaegert)
* [#3599](https://github.com/rollup/rollup/pull/3599): Retain pure annotations in class fields (@lukastaegert)
* [#3601](https://github.com/rollup/rollup/pull/3601): Fix white-space in docs (@tu4mo)

## 2.10.9
*2020-05-24*

### Bug Fixes
* Prevent invalid exports when facades are created (#3590)

### Pull Requests
* [#3590](https://github.com/rollup/rollup/pull/3590): Prevent unneeded exports when entry facades are created and ensure all exported variables in facades are imported (@lukastaegert)

## 2.10.8
*2020-05-23*

### Bug Fixes
* Fix issues when synthetic named exports are reexported as default exports (#3586)

### Pull Requests
* [#3584](https://github.com/rollup/rollup/pull/3584): Clarify documentation for `output.paths` (@jacksteamdev)
* [#3585](https://github.com/rollup/rollup/pull/3585): Target Node.js v14 instead of v13 in Windows tests (@mangs)
* [#3586](https://github.com/rollup/rollup/pull/3586): Handle default reexports of synthetic named exports over several stages (@lukastaegert)

## 2.10.7
*2020-05-22*

### Bug Fixes
* Handle modules re-exporting namespaces without further own code (#3576)

### Pull Requests
* [#3576](https://github.com/rollup/rollup/pull/3576): Fix "cannot read exports of undefined" error (@guybedford)

## 2.10.6
*2020-05-22*

### Bug Fixes
* Fix some issues around class fields (#3580)
* Prevent a maximum call stack error when a called entity references itself in its declaration (#3581)

### Pull Requests
* [#3580](https://github.com/rollup/rollup/pull/3580): Update acorn class features (@guybedford)
* [#3581](https://github.com/rollup/rollup/pull/3581): Do not fail when including call arguments of recursively defined variables (@lukastaegert)

## 2.10.5
*2020-05-19*

### Bug Fixes
* Do not remove side-effects that may influence an included default export declaration when side-effects are disabled (#3572)

### Pull Requests
* [#3572](https://github.com/rollup/rollup/pull/3572): Observe side-effects in files containing a default export declaration that reexports a variable (@lukastaegert)

## 2.10.4
*2020-05-19*

### Bug Fixes
* Tree-shake unused classes with fields unless there are side-effects in the field declaration (#3569)

### Pull Requests
* [#3569](https://github.com/rollup/rollup/pull/3569): Make sure unused classes with fields are tree-shaken if possible (@lukastaegert)

## 2.10.3
*2020-05-18*

### Bug Fixes
* Validate return value of sourcemapPathTransform option (#3561)

### Pull Requests
* [#3561](https://github.com/rollup/rollup/pull/3561): Throw error if sourcemapPathTransform-option does not return a string (@Simonwep)

## 2.10.2
*2020-05-15*

### Bug Fixes
* Properly include calls to mutating array methods in certain scenarios (#3559)

### Pull Requests
* [#3559](https://github.com/rollup/rollup/pull/3559): Make sure UnknownFooExpressions are included when referenced as return values in a MultiExpression (@lukastaegert)

## 2.10.1
*2020-05-15*

### Bug Fixes
* Do not throw when "undefined" is used as a default export (#3558)

### Pull Requests
* [#3558](https://github.com/rollup/rollup/pull/3558): Properly handle default exporting undefined (@lukastaegert)

## 2.10.0
*2020-05-13*

### Features
* Avoid unnecessary empty imports from a facade chunk to the original chunk (#3552)
* Pin facade creation order so that if several user-defined chunks reference the same module, the first always becomes the "actual" chunk while the later ones become facades (#3552)

### Bug Fixes
* Do not omit reexports from secondary chunks when creating facades for entry points without hoisting transitive dependencies (#3552)

### Pull Requests
* [#3552](https://github.com/rollup/rollup/pull/3552): Avoid unnecessary facade dependency inlining (@guybedford)

## 2.9.1
*2020-05-11*

### Bug Fixes
* Do not create unintended live-bindings or invalid reexports when reexporting global variables (#3550)

### Pull Requests
* [#3550](https://github.com/rollup/rollup/pull/3550): Track updates of globals that are exported as default (@lukastaegert)

## 2.9.0
*2020-05-10*

### Features
* Add ids of static and dynamic imports to `this.getModuleInfo` (#3542)
* Provide `getModuleInfo` and `getModuleIds` to `manualChunks` functions (#3542)
* Add nullish coalescing support (#3548)
* Make the rebuild delay in watch mode configurable and set the default to `0` for snappy rebuilds (#3502)
* Add `this.getModuleIds` to the plugin context as future replacement for `this.moduleIds` (#3542)

### Pull Requests
* [#3502](https://github.com/rollup/rollup/pull/3502): Configurable build delay (@mattdesl)
* [#3542](https://github.com/rollup/rollup/pull/3542): Extend manualChunks API (@lukastaegert)
* [#3548](https://github.com/rollup/rollup/pull/3548): Support nullish coalescing with tree-shaking (@lukastaegert)

## 2.8.2
*2020-05-07*

### Bug Fixes
* Avoid invalid code when simplifying the body of a shorthand arrow function expression (#3540)

### Pull Requests
* [#3540](https://github.com/rollup/rollup/pull/3540): Wrap object expressions in parentheses if they become children of an arrow function expression (@lukastaegert)

## 2.8.1
*2020-05-07*

### Bug Fixes
* Allow using plugins on CLI that are exported as `exports.default` (#3529)
* Do not fail side-effect detection in nested callbacks of builtins (#3539)

### Pull Requests
* [#3529](https://github.com/rollup/rollup/pull/3529): Use default named export with plugins (@NotWoods)
* [#3539](https://github.com/rollup/rollup/pull/3539): Track call side-effects both by entity and CallExpression to avoid untracked side-effects in nested calls (@lukastaegert)

## 2.8.0
*2020-05-06*

### Features
* When a dynamically imported chunk contains more exports than the imported module namespace, do not create a facade chunk but an inline namespace (#3535)

### Bug Fixes
* Do not execute dynamically imported code before synchronous code in the importing module when generating CommonJS (#3535)

### Pull Requests
* [#3535](https://github.com/rollup/rollup/pull/3535): Avoid dynamic facade chunks (@lukastaegert)

## 2.7.6
*2020-04-30*

### Bug Fixes
* Fix a type issue when a default export references a global variable (#3526)

### Pull Requests
* [#3526](https://github.com/rollup/rollup/pull/3526): Handles default exporting global variables (@lukastaegert)

## 2.7.5
*2020-04-29*

### Bug Fixes
* Prevent infinite loop when default values of function parameters in a default export contain a slash (#3522)

### Pull Requests
* [#3522](https://github.com/rollup/rollup/pull/3522): Avoid infinite loop when finding position for id insertion in default export (@lukastaegert)

## 2.7.4
*2020-04-29*

### Bug Fixes
* Fix an issue where wrong variable names were used when preserving modules (#3521)

### Pull Requests
* [#3521](https://github.com/rollup/rollup/pull/3521): Fix and improve default export alias logic (@lukastaegert)

## 2.7.3
*2020-04-27*

### Bug Fixes
* Do not access `__proto__` when running Rollup (#3518)

### Pull Requests
* [#3518](https://github.com/rollup/rollup/pull/3518): use acorn-class-fields and acorn-static-class-features from npm (@nitsky)

## 2.7.2
*2020-04-22*

### Bug Fixes
* Prevent an infinite loop when creating separate manual chunks with circular dependencies (#3510)
* Do not fail if "super" is used in the definition of a class field (#3511)
* Throw if a plugin tries to emit a file with an absolute Windows path (#3509)

### Pull Requests
* [#3509](https://github.com/rollup/rollup/pull/3509): Ban emitFile via absolute paths on Windows OS (@SASUKE40)
* [#3510](https://github.com/rollup/rollup/pull/3510): Do not fail for circular imports between manual chunks (@lukastaegert)
* [#3511](https://github.com/rollup/rollup/pull/3511): Support "super" in class fields (@lukastaegert)

## 2.7.1
*2020-04-21*

### Bug Fixes
* Use correct path for dynamic imports if `output.paths` is used (#3508)

### Pull Requests
* [#3508](https://github.com/rollup/rollup/pull/3508): Respect output.paths in dynamic imports (@lukastaegert)

## 2.7.0
*2020-04-21*

### Features
* Add `preserveEntrySignatures` option to control how exports of entry points are handled (#3498)
* Add `preserveSignature` flag to `this.emitFile` to control exports of emitted chunks (#3498)
* Add `output.minifyInternalExports` option to control if internal exports are minified (#3498)

### Pull Requests
* [#3498](https://github.com/rollup/rollup/pull/3498): Add option to configure if entry signatures are preserved (@lukastaegert)

## 2.6.1
*2020-04-12*

### Bug Fixes
* Close watch mode when stdin closes in a non-TTY environment (#3493)

### Pull Requests
* [#3493](https://github.com/rollup/rollup/pull/3493): Ensure --watch mode exits correctly when stdin is closed (@jakesgordon)

## 2.6.0
*2020-04-10*

### Features
* Allow regular expressions to declare external modules (#3482)

### Pull Requests
* [#3482](https://github.com/rollup/rollup/pull/3482): Allow regular expressions in config.external (@johannes-z)

## 2.5.0
This version is identical to 2.4.0

## 2.4.0
*2020-04-09*

### Features
* Add support for most private and public class field features (#3488)

### Bug Fixes
* Do not replace `this` with `undefined` in class field definitions (#3488)

### Pull Requests
* [#3488](https://github.com/rollup/rollup/pull/3488): Rollup class fields support (@guybedford and @lukastaegert)

## 2.3.5
*2020-04-09*

### Bug Fixes
* Never remove labels when tree-shaking is disabled (#3492)

### Pull Requests
* [#3492](https://github.com/rollup/rollup/pull/3492): Always use a new inclusion context when including declarations of variables, always inlcude labels when not treeshaking (@lukastaegert)

## 2.3.4
*2020-04-07*

### Bug Fixes
* Handle re-exporting synthetic exports from entry-points (#3319)
* Fix cross-chunk imports of synthetic exports (#3319)
* Handle namespace objects that contain re-exported synthetic namespaces (#3319)

### Pull Requests
* [#3319](https://github.com/rollup/rollup/pull/3319): Handle re-exports of synthetic named exports (@manucorporat and @lukastaegert)

## 2.3.3
*2020-04-04*

### Bug Fixes
* Add external namespaces to dynamic namespace objects (#3474)

### Pull Requests
* [#3474](https://github.com/rollup/rollup/pull/3474): Support external star exports on namespace objects (@guybedford)

## 2.3.2
*2020-03-31*

### Bug Fixes
* Only warn but do not fail build when a namespace is called as a function (#3475)
* Make sure pre-existing sourcemap comments are also removed when rebuilding using the cache (#3476)

### Pull Requests
* [#3475](https://github.com/rollup/rollup/pull/3475): Call namespace error as a warning (@guybedford)
* [#3476](https://github.com/rollup/rollup/pull/3476): Store locations for removed comments in cache (@lukastaegert)

## 2.3.1
*2020-03-30*

### Bug Fixes
* Do not fail if the config file returns an function returning a Promise (#3472)

### Pull Requests
* [#3472](https://github.com/rollup/rollup/pull/3472): Fix support for async functions as config (@lukastaegert)

## 2.3.0
*2020-03-29*

### Features
* Do not transpile config files with `.mjs` extension in Node 13+ or `.cjs` extension in any Node version and load them appropriately (#3445)
* Extract helper to load a config file the way rollup does it via `rollup/dist/loadConfigFile` (#3445)

### Bug Fixes
* Keep watching the config file if an error occurs during initial load in watch node (#3445)
* Add a helpful error message when using a transpiled config in a repository with "type": "module" (#3445)

### Pull Requests
* [#3445](https://github.com/rollup/rollup/pull/3445): Support native ESM configs in Node 13, support untranspiled configs (@lukastaegert)
* [#3468](https://github.com/rollup/rollup/pull/3468): Don't use esm output format alias in the documentation (@vsn4ik)

## 2.2.0
*2020-03-24*

### Features
* Add `renderDynamicImport` hook to rewrite dynamic import expressions (#3449)
* Add information about dynamically imported modules to `this.getModuleInfo` (#3449)

### Bug Fixes
* Make file emission work with Uin8Array sources when using Rollup in the browser (#3452)
* Fix types to allow watch to accept an array of configs (#3453)
* Do not strip `.js` extensions from AMD imports when the import is a user-supplied replacement for a non-resolvable dynamic import target (#3453)

### Pull Requests
* [#3449](https://github.com/rollup/rollup/pull/3449): Add hook to rewrite dynamic import expressions (@lukastaegert)
* [#3452](https://github.com/rollup/rollup/pull/3452): Avoid the assumption of Buffer in browser envs (@JoviDeCroock)
* [#3453](https://github.com/rollup/rollup/pull/3453): fix types since watch accepts single or array config (@lukeed)
* [#3456](https://github.com/rollup/rollup/pull/3456): fix SystemJS url in tutorial (@guybedford)

## 2.1.0
*2020-03-18*

### Features
* Allow specifying an importer when emitting files to resolve relative ids (#3442)

### Pull Requests
* [#3442](https://github.com/rollup/rollup/pull/3442): Add optional `importer` parameter to `this.emitFile` (@lukastaegert)

## 2.0.6
*2020-03-13*

### Bug Fixes
* Do not use file names from different outputs when generating sourcemaps using the `dir` option (#3440)

### Pull Requests
* [#3440](https://github.com/rollup/rollup/pull/3440): Use correct file names when writing sourcemaps for multiple outputs (@lukastaegert)

## 2.0.5
*2020-03-12*

### Bug Fixes
* Fix an issue where conditional statements would assume they have the wrong test value (#3438)

### Pull Requests
* [#3438](https://github.com/rollup/rollup/pull/3438): Make sure logical expressions always check the left argument for side-effects (@lukastaegert)

## 2.0.4
*2020-03-12*

### Bug Fixes
* Avoid conflicts between namespace imports when preserving modules (#3435)

### Pull Requests
* [#3435](https://github.com/rollup/rollup/pull/3435): Deconflict multiple `index` imports for ES format using nested export star statements (@kamranayub)

## 2.0.3
*2020-03-10*

### Bug Fixes
* Add type for this.getCombinedSourcemap to transform context (#3431)

### Pull Requests
* [#3377](https://github.com/rollup/rollup/pull/3377): Switch to yargs-parser lib (@jamesgeorge007)
* [#3426](https://github.com/rollup/rollup/pull/3426): Use strict types with PluginDriver (@NotWoods)
* [#3431](https://github.com/rollup/rollup/pull/3431): Add missing type declaration for getCombinedSourcemap (@Anidetrix)
* [#3432](https://github.com/rollup/rollup/pull/3432): Detail how return values from `augmentChunkHash` are used (@jakearchibald)

## 2.0.2
*2020-03-07*

### Bug Fixes
* Make sure the ESM import still works (#3430)

### Pull Requests
* [#3430](https://github.com/rollup/rollup/pull/3430): Fix conditional exports again (@lukastaegert)

## 2.0.1
*2020-03-07*

### Bug Fixes
* Reenable importing rollup in Node 13.0 - 13.7 (#3428)

### Pull Requests
* [#3428](https://github.com/rollup/rollup/pull/3428): Fix conditional exports in Node 13.0 - 13.7 (@lukastaegert)

## 2.0.0
*2020-03-06*

### Breaking Changes
* Rollup now requires at least Node 10 to run, or a sufficiently modern browser (#3346)
* The file structure of Rollup's ESM builds has changed:
  - The main ESM entry point is now at `rollup/dist/es/rollup.js` instead of `rollup/dist/rollup.es.js`
  - The ESM browser build is at `rollup/dist/es/rollup.browser.js` instead of `rollup/dist/rollup.browser.es.js`
  
  In general, the ESM builds now follow the same naming scheme as the CJS builds but are located in the `rollup/dist/es` subfolder instead of `rollup/dist` (#3391)
* The "watch.chokidar" option no longer accepts a `boolean` value but only an object of parameters that is passed to the bundled Chokidar instance. Chokidar installations by the user will be ignored in favour of the bundled instance (#3331)
* Modules that are completely tree-shaken will no longer be listed as part of any chunks in `generateBundle`
* The `experimentalOptimizeChunks` and `chunkGroupingSize` options have been removed
* [acorn](https://github.com/acornjs/acorn) plugins can only be used if they accept a passed-in acorn instance instead of importing it themselves. See https://github.com/acornjs/acorn/pull/870#issuecomment-527339830 for what needs to be done to make plugins compatible that do not support this yet (#3391)
* Emitted chunks now have the TypeScript type `Uint8Array` instead of `Buffer`. A `Buffer` can still be used, though (#3395)
* The TypeScript types no longer use ESTree types for AST nodes but a very generic type that does not contain information specific to certain node types (#3395)
* The signature of the `writeBundle` plugin hook has been changed to match `generateBundle`: The bundle object is now passed as second parameter instead of first and the first parameter is the output options (#3361)
* The following plugin hooks have been removed:
  - ongenerate: use `generateBundle` instead
  - onwrite: use `writeBundle` instead
  - transformBundle: use `renderChunk` instead
  - transformChunk: use `renderChunk` instead
* You can no longer access `this.watcher` on the plugin context.
* The `transform` hook can no longer return `dependencies`.
* The `treeshake.pureExternalModules` option will now show a deprecation warning when used: use `treeshake.moduleSideEffects: 'no-external'` instead
* Using `import.meta.ROLLUP_ASSET_URL_<..>` and `import.meta.ROLLUP_CHUNK_URL_<..>` in code will now show warnings: use `import.meta.ROLLUP_FILE_URL_<..>` instead
* The `resolveAssetUrl` hook will now show a deprecation warning when used: use `resolveFileUrl` instead
* The following plugin context functions will show warnings when used:
  - `this.emitAsset`: use `this.emitFile`
  - `this.emitChunk`: use `this.emitFile`
  - `this.getAssetFileName`: use `this.getFileName`
  - `this.getChunkFileName`: use `this.getFileName`
  - `this.isExternal`: use `this.resolve`
  - `this.resolveId`: use `this.resolve`
* Directly adding properties to the bundle object in the `generateBundle` is deprecated will show a warning (removing properties is allowed, though): Use `this.emitFile`
* Accessing `chunk.isAsset` on the bundle is deprecated: Use `chunk.type === 'asset'` instead
* The error code for a missing `name` property when targeting UMD has been changed to `MISSING_NAME_OPTION_FOR_IIFE_EXPORT` to emphasize this is needed for the IIFE part of UMD (#3393)

### Features
* Rollup now bundles [Chokidar](https://github.com/paulmillr/chokidar) for a better watch experience (#3331)
* Rollup now bundles [acorn](https://github.com/acornjs/acorn) again, removing its only external dependency (#3391)
* Do not consider empty imports from side-effect-free modules for chunking and hoist side-effect imports if necessary (#3369)
* Rollup can now be imported as an ES module in Node via `import {rollup} from 'rollup'`. Note that this relies on Node's experimental [conditional package exports](https://nodejs.org/dist/latest-v13.x/docs/api/esm.html#esm_conditional_exports) feature and is therefore itself experimental (#3391)
* `systemjs` can be used as format alias for `system` (#3381)

### Bug Fixes
* Unknown output options now trigger a warning when using the JavaScript API (#3352)
* Rollup will no longer introduce Node types into TypeScript projects that do not use them (#3395)
* Generate correct sourcemaps when tree-shaking occurs in a multi-file bundle (#3423)

### Pull Requests
* [#3331](https://github.com/rollup/rollup/pull/3331): Bundle Chokidar (@lukastaegert)
* [#3343](https://github.com/rollup/rollup/pull/3343): Remove experimentalOptimizeChunks (@lukastaegert)
* [#3346](https://github.com/rollup/rollup/pull/3346): Update minimum required Node version to 10 (@lukastaegert)
* [#3352](https://github.com/rollup/rollup/pull/3352): Remove active deprecations (@lukastaegert)
* [#3361](https://github.com/rollup/rollup/pull/3361): Change writeBundle signature to match generateBundle (@lukastaegert)
* [#3369](https://github.com/rollup/rollup/pull/3369): Avoid empty imports from side-effect-free chunks (@lukastaegert)
* [#3381](https://github.com/rollup/rollup/pull/3381): Rename esm to es everywhere, add systemjs alias (@lukastaegert)
* [#3391](https://github.com/rollup/rollup/pull/3391): Bundle acorn, allow importing Rollup as Node ES module, update dependencies (@lukastaegert)
* [#3393](https://github.com/rollup/rollup/pull/3393): Better error code for name-less umd bundle (@rail44)
* [#3395](https://github.com/rollup/rollup/pull/3395): Remove `@types` dependencies (@lukastaegert)
* [#3423](https://github.com/rollup/rollup/pull/3423): Update magic-string and fix sourcemaps (@lukastaegert)

## 1.32.1
*2020-03-06*

### Bug Fixes
* Handle default export detection for AMD and IIFE externals that do not have a prototype (#3420)
* Handle missing whitespace when the else branch of an if-statement is simplified (#3421)
* Mention the importing module when reporting errors for missing named exports (#3401)
* Add code to warning for missing output.name of IIFE bundles (#3372)

### Pull Requests
* [#3372](https://github.com/rollup/rollup/pull/3372): Add warning code for missing output.name of IIFE bundle that has export (@rail44)
* [#3401](https://github.com/rollup/rollup/pull/3401): Missing exports errors now print the importing module (@timiyay)
* [#3418](https://github.com/rollup/rollup/pull/3418): Structure lifecycle hooks, add links to build time hooks (@lukastaegert)
* [#3420](https://github.com/rollup/rollup/pull/3420): Update generated code of getInteropBlock() to work with null prototype objects (@jdalton)
* [#3421](https://github.com/rollup/rollup/pull/3421): Avoid invalid code when "else" branch is simplified (@lukastaegert)

## 1.32.0
*2020-02-28*

### Features
* Allow adding plugins on the command line via `--plugin <plugin>` (#3379)

### Pull Requests
* [#3379](https://github.com/rollup/rollup/pull/3379): introduce CLI --plugin support (@kzc)
* [#3390](https://github.com/rollup/rollup/pull/3390): fix typo: this.addWatchfile (@mistlog)
* [#3392](https://github.com/rollup/rollup/pull/3392): Bump codecov from 3.6.1 to 3.6.5
* [#3404](https://github.com/rollup/rollup/pull/3404): Update resolveFileUrl docs (@jakearchibald)

## 1.31.1
*2020-02-14*

### Bug Fixes
* Make sure errored files are always re-evaluated in watch mode to avoid an issue in the typescript plugin (#3388)

### Pull Requests
* [#3366](https://github.com/rollup/rollup/pull/3366): Correct spelling minifaction to minification (@VictorHom)
* [#3371](https://github.com/rollup/rollup/pull/3371): Adjust bug template to mention REPL.it (@lukastaegert)
* [#3388](https://github.com/rollup/rollup/pull/3388): Run transform hooks again in watch mode on files that errored (@lukastaegert)

## 1.31.0
*2020-01-31*

### Features
* Always disable tree-shaking for asm.js functions to maintain semantics (#3362)

### Pull Requests
* [#3362](https://github.com/rollup/rollup/pull/3362): Preserve asm.js code (@lukastaegert)

## 1.30.1
*2020-01-27*

### Bug Fixes
* Do not mistreat static entgry points as dynamic ones when chunking (#3357)
* Resolve a crash when chunking circular dynamic imports (#3357)

### Pull Requests
* [#3357](https://github.com/rollup/rollup/pull/3357): Resolve issues with circular dynamic entries (@lukastaegert)

## 1.30.0
*2020-01-27*

### Features
* Do not split chunks when dynamically imported modules import modules that are already loaded by all dynamic importers (#3354)
* Add `hoistTransitiveImports` option to disable hoisting imports of static dependencies into entry chunks (#3353)

### Bug Fixes
* Make sure polyfills are always loaded first when each static entry point contains them as first import (#3354)

### Pull Requests
* [#3353](https://github.com/rollup/rollup/pull/3353): Add option to avoid hoisting transitive imports (@lukastaegert)
* [#3354](https://github.com/rollup/rollup/pull/3354): Improve chunking algorithm for dynamic imports (@tjenkinson and @lukastaegert)

## 1.29.1
*2020-01-21*

### Bug Fixes
* Avoid crashes for circular reexports when named exports cannot be found (#3350)

### Pull Requests
* [#3335](https://github.com/rollup/rollup/pull/3335): Fix typo (@robbinworks)
* [#3342](https://github.com/rollup/rollup/pull/3342): Remove ":" from test file names for Windows and update dependencies (@lukastaegert)
* [#3350](https://github.com/rollup/rollup/pull/3350): Properly handle circular reexports (@lukastaegert)

## 1.29.0
*2020-01-08*

### Features
* Enable top-level await by default (#3089)
* Add typings for watch events (#3302)

### Bug Fixes
* Deconflict files that would conflict only on a case-insensitive OS (#3317)
* Do not fail in certain scenarios where a logical expression inside a sequence expression was being directly included (#3327)

### Pull Requests
* [#3089](https://github.com/rollup/rollup/pull/3089): Move top-level await out of experimental (@guybedford)
* [#3302](https://github.com/rollup/rollup/pull/3302): Adds type definitions for RollupWatcher events (@NotWoods)
* [#3317](https://github.com/rollup/rollup/pull/3317): Fix module id conflict on a case insensitive OS (@yesmeck)
* [#3327](https://github.com/rollup/rollup/pull/3327): Handle deoptimizations while a node is being included (@lukastaegert)

## 1.28.0
*2020-01-04*

### Features
* Allow piping in stdin via the command line interface (#3312, #3290)
* Allow plugins to mark modules as having syntheticNamedExports for e.g. better CJS interoperability (#3295)
* Ignore variable reassignments in dead code when tree-shaking to remove more unneeded code (#3212)

### Bug Fixes
* Properly respect tree-shaken code when generating sourcemaps (#3318)

### Pull Requests
* [#3212](https://github.com/rollup/rollup/pull/3212): Handle assignments in dead code (@tjenkinson)
* [#3290](https://github.com/rollup/rollup/pull/3290): Implement stdin input with optional "-" as the file name (@kzc)
* [#3295](https://github.com/rollup/rollup/pull/3295): Add syntheticNamedExports (@manucorporat)
* [#3300](https://github.com/rollup/rollup/pull/3300): Add note about setting `types` in tsconfig file (@tjenkinson)
* [#3303](https://github.com/rollup/rollup/pull/3303): Use ! to assert not-null in TypeScript (@NotWoods)
* [#3312](https://github.com/rollup/rollup/pull/3312): Implement stdin input (@lukastaegert)
* [#3318](https://github.com/rollup/rollup/pull/3318): Update magic-string and other dependencies (@lukastaegert)

## 1.27.14
*2019-12-22*

### Bug Fixes
* Update references to official rollup plugins in error messages (#3297, #3298)

### Pull Requests
* [#3286](https://github.com/rollup/rollup/pull/3286): Update link to JavaScript API documentation (@romankaravia)
* [#3294](https://github.com/rollup/rollup/pull/3294): Update deprecated references to the node-resolve plugin in the documentation (@Vlad-Shcherbina)
* [#3297](https://github.com/rollup/rollup/pull/3297): Update references to rollup-plugin-json (@cprecioso)
* [#3298](https://github.com/rollup/rollup/pull/3298): Update references to official rollup plugins (@cprecioso)

## 1.27.13
*2019-12-14*

### Bug Fixes
* Do not truncate environment variable values at the first colon when using the `--environment` option (#3283)

### Pull Requests
* [#3283](https://github.com/rollup/rollup/pull/3283): Allow environment variables to contain colons (@tlaverdure)

## 1.27.12
*2019-12-13*

### Bug Fixes
* Prevent invalid AMD or SystemJS code when accessing `import.meta` (#3282)

### Pull Requests
* [#3282](https://github.com/rollup/rollup/pull/3282): Always make "module" available for SystemJS and AMD formats if `import.meta` is accessed directly (@lukastaegert)

## 1.27.11
*2019-12-12*

### Bug Fixes
* Resolve a crash due to an infinite loop (#3280)

### Pull Requests
* [#3280](https://github.com/rollup/rollup/pull/3280): Prevent infinite deoptimizations (@lukastaegert)

## 1.27.10
*2019-12-11*

### Bug Fixes
* Keep track of function return values in more situations (#3278)

### Pull Requests
* [#3278](https://github.com/rollup/rollup/pull/3278): Avoid some unnecessary value tracking deoptimizations (@lukastaegert)

## 1.27.9
*2019-12-07*

### Bug Fixes
* Fix an issue where reexports could be missing when preserving modules (#3273)
* Allow turning of color output via NO_COLOR or FORCE_COLOR=0 environment variables (#3272)

### Pull Requests
* [#3272](https://github.com/rollup/rollup/pull/3272): Support either NO_COLOR or FORCE_COLOR=0 to turn off color (@kikonen)
* [#3273](https://github.com/rollup/rollup/pull/3273): Make sure that indirectly reexported modules also become chunk dependencies when preserving modules(@lukastaegert)

## 1.27.8
*2019-12-02*

### Bug Fixes
* Deoptimize objects when a method is called on them to make sure modifications via "this" are observed (#3266)

### Pull Requests
* [#3266](https://github.com/rollup/rollup/pull/3266): Workaround for various object literal mutation bugs (@kzc)

## 1.27.7
*2019-12-01*

### Bug Fixes
* Fix a scenario where a reassignments to computed properties were not tracked (#3267)

### Pull Requests
* [#3267](https://github.com/rollup/rollup/pull/3267): Fix incomplete computed property deoptimization (@lukastaegert)

## 1.27.6
*2019-11-30*

### Bug Fixes
* Use "auto" export mode by default for all modules when preserving modules (#3265)
* Observe "output.exports" when preserving modules and warn for mixed exports if necessary (#3265)

### Pull Requests
* [#3265](https://github.com/rollup/rollup/pull/3265): Use export mode "auto" by default when preserving modules (@lukastaegert)

## 1.27.5
*2019-11-25*

### Bug Fixes
* Make sure namespaces for inlined dynamic imports are treated as variable accesses when deconflicting (#3256)

### Pull Requests
* [#3256](https://github.com/rollup/rollup/pull/3256): Avoid name conflicts when inlining dynamic imports nested in functions (@lukastaegert)
* [#3257](https://github.com/rollup/rollup/pull/3257): Update dependencies (@lukastaegert)

## 1.27.4
*2019-11-22*

### Bug Fixes
* Aggregate circular dependency warnings in the CLI (#3249)
* Do not defer non-aggregated handlers in the CLI (#3249)

### Pull Requests
* [#3249](https://github.com/rollup/rollup/pull/3249): Fix broken Windows CLI tests (@lukastaegert)
* [#3251](https://github.com/rollup/rollup/pull/3251): Add installation as a separate header (@ashrith-kulai)

## 1.27.3
*2019-11-20*

### Bug Fixes
* Provide better warning when empty chunks are created in a code-splitting scenario (#3244)

### Pull Requests
* [#3244](https://github.com/rollup/rollup/pull/3244): Clearer empty chunk warning (@tjenkinson)

## 1.27.2
*2019-11-18*

### Bug Fixes
* Fix an issue where live bindings were not working correctly when using `+=` in SystemJS (#3242)

### Pull Requests
* [#3242](https://github.com/rollup/rollup/pull/3242): Export updated assignments when using shorthand update assignment expressions in SystemJS (@lukastaegert)

## 1.27.1
*2019-11-18*

### Bug Fixes
* Fix an issue where code after a switch-statement with removed cases was erroneously not included (#3241)

### Pull Requests
* [#3237](https://github.com/rollup/rollup/pull/3237): make `acornOptions` optional in `parse()` in docs (@tjenkinson)
* [#3240](https://github.com/rollup/rollup/pull/3240): Update dependencies and fix vulnerability (@lukastaegert)
* [#3241](https://github.com/rollup/rollup/pull/3241): Do not truncate after switch-statement with removed case (@lukastaegert)

## 1.27.0
*2019-11-12*

### Features
* Add support for output-specific plugins (#3218)
* Reenable parallel output processing when using the CLI (#3218)
* Warn if files are emitted that would overwrite previously emitted files (#3218)

### Bug Fixes
* Do not overwrite files emitted in other builds if outputs are generated in parallel (#3218)

### Pull Requests
* [#3218](https://github.com/rollup/rollup/pull/3218): Per output plugins (@lukastaegert)

## 1.26.5
*2019-11-11*

### Bug Fixes
* Fix a regression where it was no longer to pass a certain option format to generate (#3223)

### Pull Requests
* [#3223](https://github.com/rollup/rollup/pull/3223): Allow passing input options to output (@lukastaegert)

## 1.26.4
*2019-11-09*

### Bug Fixes
* Keep watching known files after a plugin error during the initial build (#3219)

### Pull Requests
* [#3216](https://github.com/rollup/rollup/pull/3216): Fix small typo (@kaisermann)
* [#3217](https://g