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Changelog

Tags:

  • [New Feature]
  • [Bug Fix]
  • [Spec Compliancy]
  • [Breaking Change]
  • [Documentation]
  • [Internal]
  • [Polish]

Note: Gaps between patch versions are faulty/broken releases.

See CHANGELOG - 6to5 for the pre-4.0.0 version changelog.

5.1.11

  • Bug Fix
  • Memoise and bind member expression decorators.
  • Move JSX children cleaning to opening element visitor. Fixes elements not being cleaned in certain scenarios.
  • Consider SwitchStatements to be Scopable.
  • Fix bluebirdCoroutines calling interopRequireWildcard before it's defined.
  • Add space to do...while code generation.
  • Validate super use before this on super exit rather than entrance.
  • Polish
  • Add Babel name to logger.

5.1.10

  • Bug Fix
  • Remove makePredicate from acorn in favor of an indexOf.
  • Remove statements to expression explosion when inserting a block statement.
  • Internal
  • Remove runtime compatibility check.

5.1.9

  • Bug Fix
  • Fix class property initializers with undefined values not being correctly writable.
  • Fix self inferring generators incorrectly causing a stack error.
  • Fix default export specifiers not triggering AMD module argument inclusion.
  • Fix assignments not having their module references properly remapped.
  • Internal
  • Upgrade to latest acorn.
  • Polish
  • Make invalid LHS pattern error messages nicer.

5.1.8

  • Bug Fix
  • Only make parenthesized object pattern LHS illegal.

5.1.7

  • Internal
  • Add parse node API.

5.1.6

  • Bug Fix
  • Fix runtime built-in catchall not properly checking for local variables.

5.1.5

  • Internal
  • Bump core-js version.

5.1.4

  • Polish
  • Add missing Reflect methods to runtime transformer.

5.1.3

  • Internal
  • Switch entirely to vanilla regenerator.
  • Clean up and make the parsing of decorators stateless.
  • Bug Fix
  • Don't do TCO on generators and async functions.
  • Add missing core-js runtime definitions.

5.1.2

  • Bug Fix
  • Add getIterator and isIterable to babel-runtime build script.

5.1.1

  • Bug Fix
  • Add missing runtime symbol definitions.

5.1.0

  • Bug Fix
  • Fix super reference when using decorators.
  • Don't do array unpack optimisation when member expressions are present.
  • Add missing descriptors for undecorated class properties.
  • Don't consider arguments and eval valid function names when doing function name inferrence.
  • Fix scope tracking of constants in loop heads.
  • Parse AwaitExpression as a unary instead of an assignment.
  • Fix regex evaluation when attempting static evaluation.
  • Don't emit tokens when doing a lookahead.
  • Add missing test declaration to utility.deadCodeElimination transformer.
  • Internal
  • Upgrade regenerator to the latest and use my branch with the hope of eventually switching to vanilla regenerator.
  • Add support for the replacement of for loop inits with statements.
  • Upgrade dependencies.
  • Polish
  • When adding the scope IIFE when using default parameters, don't shadow the function expression, just apply this and arguments if necessary.
  • Use path basename as non-default import fallback.
  • New Feature
  • Add trailing function comma proposal. Thanks @AluisioASG!
  • Add support for object literal decorators.
  • Make core-js modular when using the runtime transformer.

5.0.12

  • Bug Fix
  • Fix incorrect remapping of module references inside of a function id redirection container.

5.0.11

  • Bug Fix
  • Fix new for...of loops not properly inheriting their original loop.
  • Internal
  • Disable scope instance cache.
  • Polish
  • Allow comments in .babelrc JSON.

5.0.9

  • Polish
  • Use moduleId for UMD global name if available.
  • Bug Fix
  • Fix UMD global module variable shadowing the amd/common module variable.
  • Fix Flow param type annotation regression.
  • Fix function name collision toString wrapper. Thanks @alawatthe!

5.0.8

  • Bug Fix
  • Fix falsy static class properties not being writable.
  • Fix block scoping collisions not properly detecting modules and function clashes.
  • Skip this before super for derived constructors on functions.

5.0.7

  • New Feature
  • Add --ignore and --only support to the CLI.
  • Bug Fix
  • Remove HOMEPATH environment variable from home resolution in babel/register cache.
  • Internal
  • Disable WIP path resolution introducing infinite recursion in some code examples.
  • Polish
  • Add live binding to CommonJS default imports.

5.0.6

  • Bug Fix
  • Fix mangling of import references that collide with properties on Object.prototype.
  • Fix duplicate declarations incorrectly being reported for var.

5.0.5

  • Internal
  • Upgrade core-js.
  • Bug Fix
  • Fix arrays not being supported in util.list.

5.0.4

  • Polish
  • Check for top level breakConfig in resolveRc.

5.0.3

  • Bug Fix
  • Make relative location absolute before calling resolveRc.
  • Internal
  • Switch to global UID registry.
  • Add breakConfig option to prevent Babel from erroring when hitting that option.

5.0.1

  • Bug Fix
  • Fix duplicate declaration regression.
  • Fix not being able to call non-writable methods.

5.0.0

  • New Feature
  • Decorators based on @wycat's stage 1 proposal.
  • Class property initializers based on @jeffmo's stage 0 proposal.
  • Export extensions based on @leebyron's stage 1 proposal.
  • UMD module formatter now supports globals.
  • Add es3.runtime, optimisation.react.inlineElements and optimisation.react.constantElements transformers.
  • Add stage option that replaces the experimental one.
  • Allow ES7 transformer to be enabled via optional instead of only via stage.
  • Infer string quotes to use in the code generator.
  • Consider export { foo as default }; to be the same as export default foo;.
  • Add nonStandard option that can be set to false to remove parser support for JSX and Flow.
  • Add jsxPragma option.
  • Automatically generate CLI options based on internal API options.
  • Add support for .babelrc on absolute paths.
  • Plugin API!
  • Internal
  • Export options in browser API.
  • Rewritten parser.
  • Don't block hoist when runtime transformer is enabled in system module formatter.
  • Rewritten the internal traversal and node replacement API to use "paths" that abstracts out node relationships.
  • Polish
  • JSX output is now more inline with the official JSX transformer.
  • Hoist block scoping IIFE - this improves memory usage and performance.
  • Better IIFE detection - references are now checked to see if they're referencing the binding we're searching for.
  • Check for import reassignments in constants transformer.
  • Make method definitions with expression bodies illegal.
  • Save register cache on tick instead of SIGINT.
  • Enable strict mode on babel-node eval flag.
  • Bug Fixes
  • Add support for live bindings. This change also increases the reliablity of export specifier renaming.
  • Add support for super update and non equals assignment expressions.
  • Rename shadow constructor binding in classes.
  • Seed next iteration bindings with previous fresh bindings when reassinging loop block scoped variables.
  • Fix new expression spread referencing the wrong constructor.
  • Call resolveModuleSource on dynamic imports.
  • Added param to list of duplicate declaration kinds.
  • Breaking Changes
  • The Babel playground has been removed.
  • ES7 Abstract References have been removed.
  • Experimental option has been removed in favor of a stage option.
  • Rename returnUsedHelpers to metadataUsedHelpers.

4.7.16

  • Bug Fix
  • Fix constructor spreading of typed arrays.
  • Fix break/continue/return aliasing of non-loops in block scoping transformer.

4.7.15

  • Bug Fix
  • Fix constructor spreading of collections.

4.7.14

  • Bug Fix
  • Fix constructor spreading of Promise.
  • Internal
  • Deprecate remaining playground transformers and abstract references.

4.7.13

  • Bug Fix
  • Handle comments on use strict directives.
  • Fix assignment patterns with a left side pattern.
  • Polish
  • Special case this when doing expression memoisation.

4.7.12

  • Bug Fix
  • Deprecate playground.methodBinding.

4.7.11

  • Bug Fix
  • Fix unicode regexes stripping their unicode flag before being passed on two regexpu.

4.7.10

  • Internal
  • Deprecate playground.methodBinding and playground.objectGetterMemoization.
  • Bug Fix
  • Fix inputSourceMap option. Thanks @Rich-Harris!

4.7.9

  • Polish
  • Allow inputSourceMap to be set to false to skip the source map inference.
  • Infer computed literal property names.
  • Bug Fix
  • Fix nested labeled for-ofs.
  • Fix block scoping break colliding with the parent switch case.
  • Internal
  • Upgrade acorn-babel.

4.7.8

  • Bug Fix
  • Fix computed classes not properly setting symbols.

4.7.7

  • Bug Fix
  • Fix types API exposure.

4.7.6

  • Bug Fix
  • Fix non-Identifier/Literal computed class methods.
  • Polish
  • Add a fallback if stack on an error is unconfigurable.
  • Hoist esModule module declarations to the top of the file to handle circular dependencies better.

4.7.5

  • Bug Fix
  • Don't remap breaks to call the iterator return.
  • Polish
  • Use a different helper for computed classes for much nicer output. Also fixes a bug in symbols being non-enumerable so they wouldn't be set on the class.

4.7.4

  • Bug Fix
  • Rewrite named function expressions in optional async function transformers.
  • Hoist directives.
  • Remove Number from the list of valid runtime constructors.
  • Internal
  • spec.typeofSymbol transformer has been renamed to es6.symbols.

4.7.2

  • New Feature
  • "both" option for sourceMap.
  • Add output types to external helpers. Thanks @neVERberleRfellerER!
  • Bug Fix
  • Fix node duplication sometimes resulting in a recursion error.
  • Ignore breaks within cases inside for...of.
  • Polish
  • Split up variable declarations and export declarations to allow easier transformation.

4.7.0

  • Bug Fix
  • Add alternate to list of STATEMENT_OR_BLOCK keys.
  • Add support for module specifiers to t.isReferenced.
  • New Feature
  • Add inputSourceMap option.
  • Polish
  • Throw an error on different babel and babel-runtime versions.
  • Replicate module environment for babel-node eval.
  • Clean up classes output.
  • Spec Compliancy
  • Make it illegal to use a rest parameter on a setter.

4.6.6

  • Bug Fix
  • Fix incorrect method call in utility.deadCodeElimination transformer.
  • Fix es6.blockScopingTDZ transformer duplicating binding nodes.

4.6.5

  • Internal
  • useStrict transformer has been renamed to strict.

4.6.4

  • Bug Fix
  • Fix ForOfStatement not proplery inheriting labels.
  • When in closure mode in block scoping transformer, properly check for variable shadowing.
  • New Feature
  • New utility.inlineEnvironmentVariables and utility.inlineExpression transformers.

4.6.3

  • Bug Fix
  • Fix arguments being incorrectly aliased in arrow function rest parameter optimisation.
  • Make deoptimisation trigger safer.
  • New Feature
  • Flow types are now retained when blacklisting the flow transformer.

4.6.1

  • Bug Fix
  • Fix generators in template directory being transformed.
  • Fix exposure of util for plugins.

4.6.0

  • New Feature
  • Desugar sticky regexes to a new constructor expression so it can be handled by a polyfill.
  • Spec Compliancy
  • for...of now outputs in a lengthy try...catch this is to ensure spec compliancy in regards to iterator returns and abrupt completions. See google/traceur-compiler#1773 and babel/babel/#838 for more information.
  • Polish
  • Rest parameters that are only refered to via number properties on member expressions are desugared into a direct arguments reference. Thanks @neVERberleRfellerER!
  • $ babel no longer exits on syntax errors.
  • Internal
  • Upgrade browserify.
  • Upgrade source-map.
  • Publicly expose more internals.

4.5.5

  • Polish
  • Delete old extensions when overriding them in babel/register.

4.5.3

  • Bug Fix
  • Fix whitelisting logic for helper build script.

4.5.2

  • New Feature
  • returnUsedHelpers option and add whitelist to buildHelpers.
  • Bug Fix
  • Fix function arity on self referencing inferred named functions.
  • Internal
  • Bump acorn-babel.
  • Start converting source to ES6...

4.5.1

Babel now compiles itself!

holy shit

4.5.0

  • New Feature
  • Add .babelrc support.
  • Bug Fix
  • Move use strict directives to the module formatter bodies.
  • Internal
  • Make default bin/babel behaviour to ignore non-compilable files and add a --copy-files flag to revert to the old behaviour.

4.4.6

  • Bug Fix
  • Fix extending a class expression with no methods/only constructor. Thanks @neVERberleRfellerER!
  • Allow MemberExpression as a valid left of ForOfStatement.
  • Polish
  • Throw an error when people try and transpile code with the @jsx React.DOM pragma as it conflicts with the custom jsx constructo method detection.
  • Crawl all comments for @jsx pragma.
  • Internal
  • Upgrade chalk.
  • Upgrade core-js.

4.4.5

  • Internal
  • Remove function self reference optimisation.

4.4.4

  • Bug Fix
  • Handle inferred function ids to be reassigned and deopt to a slower but working equivalent.
  • Don't unpack array patterns that have more elements than their right hand array expression.
  • Polish
  • Improve syntax highlighting in the code frame. Thanks @lydell!
  • Internal
  • Upgrade acorn-babel.

4.4.3

  • Bug Fix
  • Fix for...of iterator break returns being duplicated.
  • Only call return on the iterator if it exists.
  • Internal
  • Rename selfContained transformer to runtime.

4.4.2

  • New Feature
  • Add moduleId option for specifying a custom module id.

4.4.0

  • New Feature
  • /*** @jsx NAMESPACE **/ comments are now honored by the react transformer.
  • getModuleName option.
  • Infer function expression names. Thanks @RReverser!
  • Bug Fix
  • Add proper control flow for tail recursion optimisation.
  • Internal
  • Remove useless format options and move the format.compact option to format.
  • Polish
  • Newline handling of the code generator has been heavily improved.
  • Code generator now deopts whitespace if the input size is >100KB.

4.3.0

  • Breaking Change
  • Remove commonStandard module formatter and make it the default behaviour of all the strict module formatters.

4.2.1

  • Polish
  • Add auxiliary comment to let scoping closure flow control.

4.2.0

  • Polish
  • Use an assignment instead of a define for __esModule in loose mode.
  • Internal
  • Add error for eval(); usage and enable strict mode for parsing.

4.1.0

  • New Feature
  • Add BABEL_CACHE_PATH and BABEL_DISABLE_CACHE environment variables.
  • Internal
  • Replace many internal util functions with modules. Thanks @sindresorhus!

4.0.2

  • Bug Fix
  • Fix generators not properly propagating their internal declarations.
  • Polish
  • Update setter param length error message.
  • Use ranges on dependencies.

4.0.0

  • 6to5 is now known as Babel.
  • Global helpers/runtime has now been given the more descriptive name of "external helpers".