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.

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

5.2.17

• Bug Fix
• Fix auxiliary comments not properly being attached to function declaration helpers.
• Add Super node type to ast-types patch.
• Ignore parameter bindings when attempting to inline them in the minification.deadCodeElimination transformer.
• Correct extensions arguments when using the Babel CLI.

5.2.16

• Bug Fix
• Fix plugins being disabled when using the whitelist.
• Fix correct function scope being passed to nameMethod.property when inferring the function name for class methods.
• Fix incorrect extensions reference causing weird issues when using the Babel CLI.
• Fix destructuring param reference replacements not inheriting from their original param.
• Spec Compliancy
• Fix order that method decorators are ran in.

5.2.15

• Bug Fix
• Fix initializer descriptor add attempt if it doesn't exist.

5.2.14

• Bug Fix
• Fix bug with initializer decorators where the descriptors weren't being defined if there was no initializer property.
• Internal
• Expose retainLines option to CLI.
• Fix retainLines option not being taken into consideration when doing multiple variable declaration declarators generation.
• Expose minified and unminified copies of dist scripts.

5.2.13

• Bug Fix
• Fix ExportDeclarations being incorrectly removed when using the utility.deadCodeElimination transformer.
• Fix position of utility transformers.
• New Feature
• Add built-in esquery support.
• Internal
• Consolidate notion of "virtual types".

5.2.12

• Polish
• Make UID generation based on module declarations much nicer.
• Internal
• Remove internal check for traversal path replacement of self. This is a pattern that could come up in the wild and it could lead to pretty nasty code and may lead to internal regressions as the test coverage isn't 100% :( Instead, just put it in the fast path.

5.2.11

• Internal
• Rename getModuleName option to getModuleId, doh.

5.2.10

• Bug Fix
• Fix numerous issues in replaceWithSourceString. Thanks @pangratz!
• New Feature
• Add getModuleName option. Thanks @jayphelps!

5.2.9

• Bug Fix
• Fix _blockHoist transformer incorrectly sorting nodes on shitty environments that aren't spec compliant in their key order.
• Fix broken parse API method reference to an undeclared import.

5.2.7

• Bug Fix
• Move utility.deadCodeElimination transformer up to avoid race conditions.
• Fix shorthand property scope binding renaming.
• Polish
• Turn helper variable declarations into function declarations if possible.
• Internal
• Removed native inheritance support from classes.
• Added replaceWithSourceString path API.
• Split up es3.propertyLiterals and es3.memberExpressionLiterals transformers to minfication.propertyLiterals and es3.memberExpressionLiterals.

5.2.6

• Internal
• Fix transformer aliases being accidently set as deprecated ones.
• Expose Pipeline as TransformerPipeline instead.

5.2.5

• Bug Fix
• Fix parse API not adding all the correct pipeline transformers.

5.2.4

• Bug Fix
• Fix race condition with the Node API being loaded awkwardly and not being able to initialise itself when used in the browser.
• Internal
• Expose transform.pipeline.

5.2.3

• Bug Fix
• Fix plugin containers being called with an undefined import. Thanks @timbur!
• Allow Flow object separators to be commas. Thanks @monsanto!
• Add missing Statement and Declaration node aliases to flow types.

5.2.2

• Internal
• Allow util.arrayify to take arbitrary types and coerce it into an array.

5.2.1

• Bug Fix
• Fix regression in node/register that caused node_modules to not be ignored.

5.2.0

• Bug Fix
• Fix plugin strings splitting arbitrarily on : which caused full paths on Windows to fail as they include : after the drive letter.
• Call class property initializers with their target instead of their descriptor.
• Fix ignore and only not properly working on Windows path separators. Thanks @stagas!
• Fix resolveRc running on files twice causing issues. Thanks @lukescott!
• Fix shorthand properties not correctly being target for isReferenced checks. Thanks @monsanto!
• Polish
• Allow passing an array of globs to babel/register only and ignore options. Thanks @Mark-Simulacrum!
• When inferring function names that collide with upper bindings, instead of doing the wrapper, instead rename them.
• Consider constant-like variable declaration functions to always refer to themselves so TOC can be performed.
• Process globs manually when using $ babel as some shells such as Windows don't explode them. Thanks @jden!
• Add alternative way to execute plugins via a closure that's called with the current Babel instance.
• Internal
• Remove multiple internal transformers in favor of directly doing things when we need to. Previously, declarations such as _ref that we needed to create in specific scopes were done at the very end via the _declarations transformer. Now, they're done and added to the scope right when they're needed. This gets rid of the crappy _declarations property on scope nodes and fixes the crappy regenerator bug where it was creating a new BlockStatement so the declarations were being lost.
• Rework transformer traversal optimisation. Turns out that calling a check function for every single node in the AST is ridiculously expensive. 300,000 nodes timesed by ~30 transformers meant that it took tens of seconds to perform while it's quicker to just do the unnecessary traversal. Seems obvious in hindsight.
• New Feature
• Add jscript transformer that turns named function expressions into function declarations to get around JScript's horribly broken function expression semantics. Thanks @kondi!
• Add @@hasInstance support to objects when using the es6.spec.symbols transformer.
• Add retainLines option that retains the line (but not the columns!) of the input code.

5.1.13

• Polish
• Remove symbol check from defineProperty helper.

5.1.12

• Bug Fix
• Fix resolveModuleSource not being ran on ExportAllDeclarations.
• Fix .babelrc being resolved multiple times when using the require hook.
• Fix parse error on spread properties in assignment position.
• Fix externalHelpers option being incorrectly listed as type string.
• Internal
• Upgrade core-js to 0.9.0.
• Spec Compliancy
• Fix object decorators not using the initializer pattern.
• Remove property initializer descriptor reflection.

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!

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".