babel/CHANGELOG.md

Changelog

Tags:

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

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

3.0.0

• Polish
• Generated code autoindentation.
• Moved global uid registry to a scope registry resulting in nicer uids.
• this is now illegal in the top level scope when using the default useStrict transformer.
• New asyncToGenerator helper that's much more compact.
• Throw errors on unknown options.
• More reliable default parameter scope.
• Helpers are now compact and have no newlines.
• Internal
• Rewritten a lot of the internals to much simpler.
• Removed TDZ from default parameters as it was very wonky and unreliable.
• Upgrade core-js to 0.4.6.
• Upgrade acorn-6to5.
• JSX support is now on-par with react-tools/esprima.
• Shorthand destructuring.
• Bug Fix
• Generators now work flawlessly with any parameter transformers.
• Optional async function transformers should not name their functions.
• Remove unlink event watching in bin/6to5.
• Fix regenerator variable declarations being incorrectly hoisted breaking scope.
• Transformers that attempted to simplify expressions that had no consequence now take into account whether it's one of the last statements/expressions in the script.
• New Feature
• New selfContained transformer.
• New undeclaredVariableCheck optional transformer.
• Added --blacklist and --whitelist options to 6to5-node.
• Breaking Change
• Caching is now always enabled for the require hook. It also now no longer caches require resolutions.
• Bare super(); only works inside of constructors.
• Removed the optional runtime in favor of the selfContained transformer.
• This shorthand has been removed from the playground.
• 6to5/polyfill can now only be required once.
• CLI
• --indent option has been removed.
• --include-regenerator option has been removed.
• --amd-modules-id option has been removed, use --module-ids instead.
• Options
• amdModuleIds option has been removed, use moduleIds instead.
• includeRegenerator has been removed.
• ignoreRegex fallback has now been dropped from the require hook. register(/foo/);, register({ ignoreRegex: /foo/ }) -> register({ ignore: /foo/ }).
• Modules
  • Module interop now only collapses to module.exports when there's a single export that's default.
  • Imports and exports are now illegal anywhere except the root level by default. Set modules to loose mode to allow them everywhere.
• Transformers
  • Optional fast transformer backwards compatibility support has been removed. Use loose mode.
  • Removed the coreAliasing transformer in favor of selfContained.
  • Renamed transformers:
  • specNoForInOfAssignment -> validation.noForInOfAssignment
  • specSetters -> validation.setters
  • specBlockScopedFunctions -> spec.blockScopedFunctions
  • malletOperator -> playground.malletOperator
  • methodBinding -> playground.methodBinding
  • memoizationOperator -> playground.memoizationOperator
  • objectGetterMemoization -> playground.objectGetterMemoization
  • modules -> es6.modules
  • propertyNameShorthand -> es6.properties.shorthand
  • arrayComprehension -> es7.comprehensions
  • generatorComprehension -> es7.comprehensions
  • arrowFunctions -> es6.arrowFunctions
  • classes -> es6.classes
  • objectSpread -> es7.objectSpread
  • exponentiationOperator -> es7.exponentiationOperator
  • spread -> es6.spread
  • templateLiterals -> es6.templateLiterals
  • propertyMethodAssignment -> es6.properties.shorthand
  • computedPropertyNames -> es6.properties.computed
  • defaultParameters -> es6.parameters.default
  • restParameters -> es6.parameters.rest
  • destructuring -> es6.destructuring
  • forOf -> es6.forOf
  • unicodeRegex -> es6.unicodeRegex
  • abstractReferences -> es7.abstractReferences
  • constants -> es6.constants
  • letScoping -> es6.blockScoping
  • blockScopingTDZ -> es6.blockScopingTDZ
  • generators -> regenerator
  • protoToAssign -> spec.protoToAssign
  • typeofSymbol -> spec.typeofSymbol
  • coreAliasing -> selfContained
  • undefinedToVoid -> spec.undefinedToVoid
  • undeclaredVariableCheck -> validation.undeclaredVariableCheck
  • specPropertyLiterals -> minification.propertyLiterals
  • specMemberExpressionLiterals -> minification.memberExpressionLiterals

2.13.7

• Bug Fix
• Don't realias variables that are already declared in optional coreAliasing transformer.

2.13.6

• Bug Fix
• Add NewExpression as a valid parent for parentheses insertion for ConditionalExpression.

2.13.5

• Bug Fix
• Allow rest parameters to be destructuring patterns.
• Internal
• Upgrade kexec to 1.1.0.

2.13.4

• Bug Fix
• Fix ordering of destructuring and default params.
• Fix loop body scope.
• Fix for...of transformation not retaining it's scope.
• Add destructuring assignment support to scope tracking.
• Polish
• More reliable newlines for pretty printing variable declarations.

2.13.3

• Internal
• Add coverage and vendor to npmignore.

2.13.2

• Bug Fix
• Fix super inside of nested functions.
• Internal
• Move let scoping TDZ into a separate transformer until it's more solid.
• Use process.stdin.write instead of console.log in bin to avoid sprintfification.

2.13.1

• New Feature
• Temporal dead zone for block binding.

2.13.0

• New Feature
• Block scoped functions.
• Add --loose all option.
• Add playground mallet operator thanks to @jridgewell.
• Bug Fix
• Rewrote large parts of the let scoping transformer. Now passes all known tests.
• Internal
• Even more optimisations thanks to the awesome @gaearon.
• Upgrade acorn-6to5.
  • Fixes exponentation operator thanks to @charliesome.
  • Fix flow optional parameters with types.
• Upgrade chokidar to 0.12.6.
• Upgrade commander to 2.6.0.
• Upgrade core-js to 0.4.5.
• Upgrade estraverse to 1.9.1.
• Upgrade jshint to 2.5.11.
• Upgrade regenerator to 0.8.9.
• Upgrade regexpu to 1.0.0.
• Upgrade source-map to 0.1.43.
• Upgrade source-map-support to 0.2.9.
• Upgrade browserify to 8.1.1.
• Upgrade chai to 1.10.0.
• Upgrade istanbul to 0.3.5.
• Upgrade mocha to 2.1.0.
• Upgrade uglify-js to 2.4.16.

2.12.6

• Bug Fix
• Add missing flow type traversal keys.

2.12.5

• Internal
• Fix incorrect for...in loop still causing ember-script issues.

2.12.4

• Polish
• Rest parameters now allocate the array before populating.
• Internal
• for...in loops have been changed to optimised for loops - better performance and no enumeration of protoype keys.
• Parts of the code generator have now been optimised thanks to gaearon.

2.12.3

• Spec Compliancy
• Optional typeof transformer checks for undefined before passing it to the helper.
• Class methods are now named.

2.12.2

• Internal
• Exclude nodes in function parameters and catch clauses from isReferenced check.

2.12.1

• Internal
• Add .jsx to list of allowed extensions.

2.12.0

• Bug Fix
• Support non-string JSX literals.
• New Feature
• Loose mode for some transformers that enables non-spec behaviour.
• Internal
• Uglify --mangle sort has been added to the build script, cutting minified scripts in half.

2.11.4

• Internal
• Make all dependency versions fixed.

2.11.3

• Bug Fix
• Allow a string to be passed as the optional option.

2.11.2

• Bug Fix
• Support esprima-style catch clause handlers.
• Polish
• Don't print a stacktrace for syntax errors in the CLI.

2.11.1

• Bug Fix
• Remove stray console.log outputting debug code.
• Remove Dict from coreAliasing.

2.11.0

• Bug Fix
• Fix unnecessary IIFE in default parameters on method calls.
• Add support for supers inside of closures.
• New Feature
• Add --keep-module-id-extensions/keepModuleIdExtensions option to keep extensions in module ids.
• Polish
• Special case single argument spread properties in super inside classes.
• Don't use a variable declaration for class declaration IFFE.
• Rename inherits helper parameters.
• coreAliasing transformer now aliases Promise, Set, Map and more. Thanks @AluisioASG.

2.10.1

• Internal
• Upgrade core-js to 0.4.4.
• New Feature
• Added --include-regenerator option to CLI and includeRegenerator option to API that includes the regenerator runtime if necessary.

2.10.0

• New Feature
• Add classesFastSuper optional transformer that doesn't support parent getters and prototype changing.
• Add forOfFast transformer that speeds up for...of on arrays but produces more code.
• Add --react-compat to bin/6to5.
• Spec Compliancy
• Disallow setters without a single parameter.
• Add configurable and writable to defined properties.
• Use define instead of assignment for class methods.
• Polish
• Fix bin name in 6to5-node --help.
• Fix shorthand --whitelist name in bin/6to5.
• Internal
• Hot code optimisation of traversal etc thanks to gaearon.

2.9.4

• Bug Fix
• Support UpdateExpressions as MemberExpression objects.

2.9.3

• Bug Fix
• Remove exportsWildcard helper in favor of defaults.

2.9.2

• Bug Fix
• Pass exports to exportWildcard helper to allow for use inside the optional runtime.

2.9.1

• Bug Fix
• Fix runtime generator breaking the helper inclusion loop.

2.9.0

• Internal
• Upgrade acorn-6to5.
  • Now supports destructuring shorthand properties.

2.8.1

• Bug Fix
• Fix computed accessors on object literals.

2.8.0

• New Feature
• Add commonStrict, amdStrict and umdStrict module formatters that remove module.exports interop assignment.
• Add --indent option to the 6to5 CLI.

2.7.4

• Polish
• Inherit assignments from their declaration in destructuring.
• Properly align multi-declarator variable declarations.

2.7.3

• Polish
• Indent and add newlines to React.createElement calls in react transformer.
• Remove Object.assign calls and replace it with an extends helper.

2.7.1

• New Feature
• Expose version on browser and node API.
• Internal
• Upgrade core-js to 0.4.1

2.7.0

• Spec Compliancy
• Disallow reassignments of imports.
• New Feature
• reactCompat option to enable pre-v0.12 react components.

2.6.3

• Bug Fix
• Fix 2.6.0 regression caused by faulty export default from a source handling.

2.6.2

• Bug Fix
• Fix rest parameter keys when on functions with params.

2.6.1

• Bug Fix
• Fix rest parameter arguments key.

2.6.0

• Bug Fix
• Better handling of number literal property keys.
• Handle NewExpression paren insertion edegcases better.
• Internal
• Fix incorrect AST node identifier("this").
• Better toIdentifier method that handles reserved words.
• Upgrade acorn-6to5.
  • Fix exponentiation operator precedence.
  • Fix line terminators after async contextual keywords.
  • Add semicolons as class elements inside of a class body.
• Upgrade to core-js 4.0.0.
• Upgrade to regenerator 0.8.3.
  • Fix non-loop labeled statements.
• New Feature
• Basic destructuring defaults
• Add .es to list of supported extensions.
• Add optional typeofSymbol transformer.
• Use a for loop for rest parameters instead of Array.prototype.slice.
• Polish
• Move "use strict"; to inside module bodies instead of at the top of the file.
• Better handling of dynamic imports.
• Spec Compliancy
• Class inheritance now has a function or null type check.
• Add interopRequireWildcard around wildcard imports and exports to handle non-object exports.

2.5.0

• Remove noDuplicateProperties transformer.
• Better generated UIDs based on nodes.
• Default parameters now use arguments[i], conditionals and variable declarations instead of using long-form if statements.

2.4.10

• Upgrade acorn-6to5.

2.4.9

• Upgrade acorn-6to5.
• Add optional protoToAssign transformer.
• Fix missing properties from computed property keys.
• Make ES7 comprehensions let variables.

2.4.8

• Make require("6to5/register") work with browserify - #370. Thanks @hughsk!

2.4.7

• Upgrade acorn-6to5.

2.4.6

• Move coreAliasing and undefinedToVoid transformers down to catch moduleFormatter transforms.

2.4.5

• Avoid printing comments if they've already been output.

2.4.4

• Add module type to browser build <script> handler.
• Fix some MemberExpression modifying incorrectly setting property to a MemberExpression.

2.4.3

• Upgrade acorn-6to5.
• Add support for FunctionDeclarations in bluebirdCoroutines and asyncToGenerators transformers.

2.4.2

• Upgrade acorn-6to5.
• Better uids generated for various transformers based on parent node.
• Alias flat references in coreAliasing transformer.

2.4.1

• Better whitespace handling of parenthesized expressions due to trailing comments.
• Fix yield inside of comprehensions.

2.4.0

• Use a closure always for classes with a super.
• Always use native loops for array comprehensions.
• Allow yield inside of comprehensions.
• Add optional bluebirdCoroutine transformer.
• Add optional asyncToGenerator transformer.
• Move useStrict transformer to before _moduleFormatter causing "use strict"; to always be placed the very top.

2.3.2

• Add parens on expressions with trailing comments.

2.3.1

• Add undefinedToVoid optional transformer.
• Use Object.defineProperty for computed properties.

2.3.0

• Upgrade acorn-6to5.
• Support circular references and hoist variable declarations in system module formatter.
• Add optional transformers, including a new coreAliasing transformer that aliases native ES6 static properties to their core-js equivalent.

2.2.0

• Make system module formatter modules anonymous by default.
• Fix duplicate comments being output, breaking code.

2.1.0

• Add cache option to register hook.
• Update core-js.
• Fix starting newline not being added on case statements.
• Fix destructuring VariableDeclarations not inside BlockStatements and Program.

2.0.4

• Avoid being greedy when destructuring array iterables.

2.0.3

• Hoist function declarations in system module formatter for circular references.
• Hoist default function declarations in umd and amd module formatters for circular references.

2.0.2

• Inherit comments in for-of transformer.
• Remove interopRequire from system module formatter.

2.0.1

• Remap UpdateExpression module export binding.
• Fix automatic closure on PrivateDeclaration in classes.

2.0.0

• Make string literal generation only escapes unicode that it has to.
• Internal code generation format options have been exposed.
• Change playground method binding operator from : to # removing ambiguous syntax with terns.
• Fix rest parameters in async and generator functions.
• Export/import declarations replace by the modules transformer now inherit comments.
• Added playground flag to 6to5-node.
• 6to5-node now behaves the same as node.
• 6to5-node now uses kexec to become the forked process to correctly propagate signals on unix.
• Constants are now block scoped.
• Exposed ast transformer.
• Merged commonInterop and common module formatters.
• Fix generator comprehensions not inheriting arguments, this etc.
• Object and class mutator shorthand are now enumerable.
• Remove regenerator Generator has already finished error which isn't spec-compliant.
• Expose internal spec transformers that nicen up code output.
• Add export variable declaration default initializers.
• Propagate export declaration reassignments.
• Add initializer default to block scoped variable declarations within a loop.
• Flow type support.
• Make async/await contextual keywords.
• Allow yielding of non-objects.
• Class declarations now lack an IIFE.
• Support falsy and null super classes.
• Add support for experimental abstract references private declarations.
• Leave out IIFE for class declarations.
• Switched to core-js from es6-symbol and es6-shim for built-in polyfill.
• amd and umd module formatters now behave the same as common with interopRequire.
• Micro-optimizations to boost performance by 200%.
• Rename module formatter methods import to importDeclaration and export to exportDeclaration.
• Support multiple declarators in export variable declarations.
• Freeze tagged template literal object.
• Remove inlined regenerator fork.
• Remove ParenthesizedExpression.
• Rename object-spread helper to object-without-properties.
• Rename class-props helper to prototype-properties.
• Rename extends helper to inherits.
• Completely rewritten system module formatter.

1.15.0

• Don't alias GeneratorFunction and check the name which causes minifiers to remove the name and throw an error later on when we check if it's set.

1.14.18

• Fix files only containg comments not being output.
• Fix duplicate comments on property key shorthands.

1.14.17

• Add default initializer to let variables within loop bodies.
• Fix excessive break replacement inside of switches in let scoping.

1.14.16

• Add object getter memos and this shorthand to playground.
• Fix while loops in let scoping.
• Upgrade acorn-6to5.

1.14.14

• Fix template literals escaping.

1.14.13

• Fix let scoping of while loops.
• Make class methods enumerable.

1.14.12

• Fix duplicate dynamic expressions in call spread.

1.14.10

• Fix let scoping unneccesary override.

1.14.6

• Avoid ensuring a block on non-array node replacements.

1.14.5

• Upgrade acorn-6to5.
• Fix JSON recursion error for unknown code generator node types.
• Ensure that a statement is a block on block/statement types when replacing them with multiple nodes.

1.14.4

• Merge pretzel maps and method binding.

1.14.3

• Add playground pretzel maps.

1.14.2

• Fix commonInterop default export handling.
• Fix keyworded property key identifiers being turned into computed property key literals.

1.14.1

• Inherit comments from ClassDeclaration.

1.14.0

• Add playground.

1.13.13

• Fix --debug in bin/6to5-node. Thanks @timoxley.

1.13.12

• Ignore XJSEmptyExpressions in react transformer output.

1.13.11

• Fix util.regexify on falsy values.
• Fix _aliasFunction with rest parameters.
• Export as module.exports instead of exports.default if there are no other ExportDeclarations in commonInterop module formatter.
• Add system module formatter. Thanks @douglasduteil.

1.13.10

• Add support for AssignmentExpression destructuring outside of ExpressionStatement.

1.13.9

• Fix VirtualPropertyExpression visitor keys.

1.13.8

• Only use a single reference in abstract references.

1.13.7

• Upgrade acorn-6to5.
• Add experimental exponentiation operator support.

1.13.6

• Fix experimental object spread/rest helper.

1.13.5

• Upgrade acorn-6to5.
• Add experimental support for object spread/rest.
• Change arguments to array to an additional helper method.

1.13.4

• Fix single spread element returning itself.

1.13.3

• Upgrade acorn-6to5.
• Add experimental support for abstract references.

1.13.2

• Optimise Array.from usage by adding a helper method.
• Upgrade acorn-6to5.

1.13.1

• Fix constructor spread optimisation. Thanks @zloirock.

1.13.0

• Put experimental ES7 features behind a flag --experimental and experimental option.
• Constructor spread performance increase. Thanks @RReverser.
• Use self instead of window in the optional 6to5 runtime. Thanks @RReverser.

1.12.26

• Support computed property destructuring.

1.12.25

• Update acorn-6to5, ast-types, es6-shim, chokidar, estraverse and private.

1.12.24

• Collect references that haven't been declared in scope.

1.12.23

• Fix generator function export hoisting.

1.12.22

• Update fs-readdir-recursive and chokidar.
• Support array destructuring on iterables.
• Make amd module id optional. Thanks @webpro.

1.12.21

• Fix unneccesary let scoping replacement.
• Add commonInterop module formatter. Thanks @Naddiseo.
• Fix return outside of function body bug. Thanks @brentburg.
• Add more flexible option types.

1.12.20

• Append sourceMappingURL when using bin/6to5 and output sourcemaps.

1.12.19

• Add comments option and --remove-comments flag. Thanks @webpro.
• Embed regenerator.

1.12.18

• Use global reference instead of window.

1.12.17

• Add moduleName, sourceRoot and filenameRelative options. Thanks @darvelo.
• Traversal optimisations.

1.12.16

• Fix comments not being retained from MethodDefinition in classes.
• Add temporal dead zone in default parameters.

1.12.15

• Update acorn-6to5.

1.12.14

• Fix duplicate let scoping in functions.
• Make JSX whitespace more React-compliant.
• Add _memberExpressionKeywords transformer that turns keyword identifiers to computed literals.
• Upgrade regenerator-6to5.

1.12.13

• Support duplicate constants within different block scopes.
• Fix for-head duplication testing and replacement.
• Support raw property on tagged template literals.

1.12.12

• Make scope tracker more reliable to handle all edgecases.

1.12.11

• Block scope classes.
• Fix generation of integer Literals in MemberExpression.

1.12.10

• Fix let scoping var hoisting.

1.12.9

• Escape unicode characters when generating string Literals.
• Fix semicolons being output for statements in ExportDeclaration.
• Fix WithStatement missing parenthesis.

1.12.8

• Temporarily forbid AssignmentExpression destructuring outside of ExpressionStatement.

1.12.7

• Update to latest acorn-6to5.

1.12.6

• Update to latest acorn-6to5.

1.12.5

• Fix excessive whitespace trimming resulting in innaccurate sourcemap line.

1.12.4

• Add doc folder for documentation.

1.12.3

• Support generator comprehensions.
• Use Array.from instead of Array.prototype.slice in spread transformer.
• Support spread in NewExpressions.

1.12.2

• Upgrade matcha to 0.6.0 and browserify to 6.3.2.
• Add own trimRight helper instead of relying on the string instance method.
• Support JSX spreads that aren't the first.

1.12.1

• Fix this and arguments mapping in the _aliasFunctions transformer.

1.12.0

• Combine jsx and react transformers to react.
• Update react syntax output to React v0.12.

1.11.15

• Fix JSX literal whitespace generation.

1.11.14

• Avoid using a switch for let-scoping continue and break statements and use an if statement instead.
• Remove excess whitespace and newlines from JSX literals.

1.11.13

• Update regenerator-6to5
• Add support for most escodegen formatting options