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0.25.1

babel-plugin-syntax-hermes-parser

  • Add parseLangTypes option to enable skipping plugin for non-Flow files

0.25.0

flow-api-translator

  • Support React.RefSetter translation and remove support for incorrect React.Ref translation.

0.24.0

hermes-parser

  • Allow trailing comma after rest param in component declaration
  • Allow trailing comma after rest param for component types
  • Don't allow newline after async in method proper

0.23.1

hermes-transform

  • Fixed an issue that caused an error when trying to print a Program with an empty body array and a docblock comment.

flow-api-translator

  • Added support for as expressions in parent classes like class A extends (Foo as Bar).

0.23.0

hermes-estree

  • Adopted one-sided type guards in predicate functions (implies x is T)

hermes-parser

  • Added reactRuntimeTarget config option (defaulting to '18') that when set to '19' no longer adds the forwardRef wrapper as React 19 treats refs on function components as regular props.

hermes-transform

  • Allow context.modifyInPlace API to modify the Program node. Previously, this relied upon context.replaceNode internally which meant modifications to the Program node itself were not possible.

flow-api-translator

  • Added support for parsing member expressions in parent classes like class A extends Foo.Bar and type casts such as class A extends (Foo: Bar).
  • Added support for the StringPrefix and StringSuffix Flow types, turning them into a TS string literal type. For example, StringPrefix<foo> is turned into foo${string} and StringPrefix<foo, T> is turned into foo${T}.
  • Added support for inexact tuple types in TS by spreading an array of unknown (mixed) to the end of the array. This will allow for additional arbitrary elements in the tuple.

0.22.0

hermes-eslint

  • Fixed analysis of mapped types' scopes

prettier-plugin-hermes-parser

  • Added support for printing inexact tuple type annotations [...]
  • Added support for printing Flow Enums with bigint members
  • Added support for printing the one-sided variant of type guards implies x is T

0.21.1

flow-api-translator

  • Added support for translating React.AbstractComponent with 3 type arguments into TS. The third type argument containing render type information will be ignored.

0.21.0

hermes-parser

  • Added support for as const expressions
  • Added support for inexact tuple type annotations [...]
  • Added support for parsing Flow Enums with bigint members
  • Added support for a one-sided variant to type guards implies x is T

0.20.1

hermes-eslint

  • Scope analysis support for typeof nodes with type arguments

babel-plugin-syntax-hermes-parser

  • Support for use in beta releases of Babel 8

0.20.0

prettier-plugin-hermes-parser

  • Added support for newer unreleased Flow syntax

0.19.2

hermes-parser

  • Bug fixes in preparation of new feature rollout

0.19.1

hermes-eslint

  • Scope analysis support for DeclareNamespace nodes

0.19.0

flow-api-translator

  • $ReadOnlyMap and $ReadOnlySet have been updated to expect two type arguments instead of one, aligning with the flow API.

0.18.2

hermes-parser

  • Retain more type annotations when lowering to babel AST.

0.18.1

flow-api-translator

  • Update codegen to output type guards instead of %checks
  • handle Literal properties in flow-to-flowdef conversion

babel-plugin-syntax-hermes-parser

  • Do not apply the plugin for TS files

0.18.0

hermes-eslint

  • Include JSX closing elements in scope/bindings references

0.17.1

hermes-estree

  • Fix type of typeAnnotation property of AsExpression

hermes-parser

hermes-eslint

  • Ensure types cast to in AsExpressions are considered as referenced

hermes-transform

  • Fix an issue with preserving comments of optional chaining nodes

flow-api-translator

  • Add support for AsExpressions in Flow to Flow def

prettier-plugin-hermes-parser

  • Patch prettier#15514, fixing edge case of AsExpression printing

babel-plugin-syntax-hermes-parser

0.17.0

hermes-estree

hermes-parser

  • Parse AsExpressions in Flow.
  • Fix ObjectTypeMappedTypeProperty babel lowering to output valid code.

hermes-eslint

hermes-transform

flow-api-translator

prettier-plugin-hermes-parser

  • Update internal version of prettier to version 3.0.3.

babel-plugin-syntax-hermes-parser

0.16.0

hermes-estree

  • Improve types of DestructuringObjectPropertyWithShorthandStaticName, ExportNamedDeclarationWithSpecifiers, ObjectTypeAnnotation and BigIntLiteral.

hermes-parser

  • Major refactor of hermes parser babel support infra to allow safer/easier transforms and more closely match babel output.
  • Correct FunctionExpression property range.
  • Correct DeclareEnum babel output to correctly wrap the TypeAnnotationType in a TypeAnnotation.
  • Upgrade to latest emscripten (3.1.44 from 3.1.3).

hermes-eslint

hermes-transform

flow-api-translator

  • Correctly handle converting identifier references via typeof identifier.
  • Support conditional types, type guards, infer, mapped object types, $ReadOnlyMap and $ReadOnlySet.

prettier-plugin-hermes-parser

  • Update internal version of prettier to version 3.0.2.

babel-plugin-syntax-hermes-parser

0.15.1

hermes-estree

hermes-parser

  • Ensure ExportNamespaceSpecifier has location information.

hermes-eslint

hermes-transform

  • Update prettier-plugin-hermes-parser peer dependency version.

flow-api-translator

prettier-plugin-hermes-parser

babel-plugin-syntax-hermes-parser

0.15.0

hermes-estree

hermes-parser

  • Correctly convert MethodDefinition to ClassPrivateMethod when babel: true is set and the key is PrivateName.

hermes-eslint

hermes-transform

  • Ensure the prettier print cache key is unique even if there is more than one instance of hermes-transform.
  • Add peer dependency on prettier-plugin-hermes-parser.

flow-api-translator

  • Remove support for now removed $Shape and $Partial Flow utilities.
  • Add support for tuple labeled and spread elements.
  • Support translating React.ElementProps from Flow to TS.
  • Support ExportAllDeclaration in TS translation.

prettier-plugin-hermes-parser

babel-plugin-syntax-hermes-parser

0.14.0

hermes-estree

hermes-parser

  • Added support for Flow's new type guards

hermes-eslint

hermes-transform

flow-api-translator

prettier-plugin-hermes-parser

babel-plugin-syntax-hermes-parser

0.13.1

hermes-estree

hermes-parser

hermes-eslint

hermes-transform

flow-api-translator

prettier-plugin-hermes-parser

  • The previous release did not build properly for release. This release fixes the issue.

babel-plugin-syntax-hermes-parser

  • The previous release did not build properly for release. This release fixes the issue.

0.13.0

hermes-estree

hermes-parser

  • Strip TS only tsModifiers property from PropertyDefinition nodes
  • Fix issue with ConditionalTypeAnnotation not being correctly stripped with babel: true mode.

hermes-eslint

hermes-transform

  • Switched the printer to always use prettier-plugin-hermes-parser to ensure it can support the latest Flow syntax.

flow-api-translator

  • Switched the printer to always use prettier-plugin-hermes-parser to ensure it can support the latest Flow syntax.

prettier-plugin-hermes-parser

  • Patched issue in prettier that caused infinite recursion when printing array produced by hermes-transform.

babel-plugin-syntax-hermes-parser

  • Created new package which creates a Hermes parser plugin for Babel. This plugin switches Babel to use hermes-parser instead of the @babel/parser. Since Hermes parser uses C++ compiled to WASM it is significantly faster and provides full syntax support for Flow.

0.12.1

prettier-plugin-hermes-parser

  • Lazy load the plugin so it does not effect performance if its included but not used.
  • Strip Flow parser from embedded prettier v3 bundle to improve plugin initialization time.

0.12.0

hermes-parser

  • Fix process.exitCode being overridden when initializing WASM.
  • Add support fo parsing type parameter bounds separated by extends keyword in Flow.

hermes-transform

  • Add support for Prettier v3.

hermes-eslint

hermes-estree

flow-api-translator

prettier-plugin-hermes-parser

  • Created prettier-plugin-hermes-parser package. This is a plugin for Prettier to enable the use of Hermes parser. It supports Prettier v3 and v2 but always prints via the latest prettier v3 printing logic, to enable full support for all Hermes parser features.

0.11.1

flow-api-translator

  • Fix dependency versions.

0.11.0

hermes-parser

  • Update Flow AST representation for typeof types. TypeofTypeAnnotation now can have QualifiedTypeofIdentifier and Identifiers as arguments directly.
  • Add support for parsing TupleTypeSpreadElement and TupleTypeLabeledElement in Flow.
  • DeclareVariable in Flow now has a kind property, which can be var, let, or const.
  • Add support for parsing DeclareEnum in Flow.
  • Add support for parsing type arguments in JSXElement in Flow.
  • Fixes typo in parsed TypeScript TSConditionalType nodes. The falseTYpe property has been renamed to falseType.
  • Add support for parsing keyof types in Flow.
  • Add support for parsing ConditionalTypeAnnotation in Flow.
  • Add support for parsing InferTypeAnnotation in Flow.
  • Add support for parsing ObjectTypeMappedTypeProperty in Flow.
  • Add support for parsing TypePredicate in Flow.

hermes-transform

  • Add support for Flow AST nodes as parsed by hermes-parser@0.11.0.
  • Exports makeCommentOwnLine function which makes added comments print on their own line.
  • Add support for corrected MemberExpression representation with optional property from hermes-estree@0.11.0.

hermes-eslint

hermes-estree

  • Add support for Flow AST nodes as parsed by hermes-parser@0.11.0.
  • Fix MemberExpression to properly expose optional property in Flow.

flow-api-translator

  • Add handling for updated typeof type representation.
  • Add handling for DeclareVariable with kind property.
  • Add handling for DeclareEnum.
  • Adds error recovery for unsupported Flow syntax in TypeScript translation. Instead of exiting, most errors will now be printed as comments in the output TypeScript code with appropriate type fallbacks.
  • Add handling for Flow typeof imports.
  • Improve scope resolution of React imports.
  • Add React.ElementConfig handling.
  • Add React.Key handling.
  • Add React.Ref handling.
  • Add React.Component handling.
  • Add React.ElementType handling.
  • Add React.ChildrenArray handling.
  • Improve React.ComponentType handling.
  • Improve React.AbstractComponent handling.

0.10.1

hermes-parser

  • Remove unlisted dependency on the hermes-eslint package as this caused module not found errors if you only installed the hermes-parser package.

flow-api-translator

  • Support global React type annotations, e.g. React$Node.
  • Support export default of global type annotations.
  • Fix issue with older version of prettier incorrectly printing TS value import statements.
  • Add hermes-eslint as explict dependency.

0.10.0

hermes-parser

  • Add SimpleTransform API. This API is designed similar to the SimpleTraversal API but allows mutating the AST while traversing enabling the use of recursive transforms. The hermes-transform package by contrast only allows mutations at the end which is much easier to reason about but limits what can be achieved.
  • Add support for BigIntTypeAnnotation parsing, e.g. type T = bigint;.
  • Prevent docblock directives from being able to crash the parser.

hermes-transform

  • Add stopTraversal and skipTraversal API's. stopTraversal will abort the traversal all together where as skipTraversal will continue traversal but not traverse into the current node's child nodes.
  • Export MaybeDetachedNode type and asDetachedNode function.
  • Fix ChainExpression and ObjectTypeProperty node printing.
  • Export new parse, print API's in addition to the transform API. The parse API will call the hermes-parser as well as prepare the AST for transform, by running comment attachment and setting docblock properties. The print API creates source text from the AST via prettier, it also does all work necessary to prepare the AST for prettier, for example reattaching the docblock as a simple comment.
  • Stop the docblock from being attached to the first statement. It is now only accessible via the docblock property on Program. This ensures the docblock comment is not duplicated if the first statement is moved.
  • Add Program node generator, e.g. t.Program({...}). This allows full AST's to be created.

hermes-eslint

  • Fix incorrect reference created by a JSX namespace name.
  • Fix JSX above the React import not correctly marking React as used.
  • Mark function variables as used if they have multiple defs and the declaration is exported.

hermes-estree

  • Improve AST Flow types.
  • Add isExpression and isStatement predicate functions.

flow-api-translator

  • Created flow-api-translator package. This allows translating Flow code into either Flow definitions or TS definitions along with generating the non typed runtime code. This is designed to help library authors using Flow to more easily support the use of their code in TS or Flow codebases.

0.9.0

hermes-transform

  • Fix unnecessary newlines being added during printing.
  • Fix handling of arrays with nullable elements in shallowCloneArray (like an array's .elements property).
  • Add modifyNodeInPlace API for directly modifying a node with an implicit clone.
  • Improve infra so that explicit cloning is mostly unnecessary.
    • Most of the API will automatically shallow-clone any node that's passed in.
    • The APIs still exist should you want to explicitly clone to control the depth, etc.

hermes-eslint

  • Add handling for FBT's fbs tags in scope analysis.
  • Add handling for function type this param in scope analysis.

hermes-estree

  • Improve types for private brand checks (#priv in this)
  • Add explicitly typed parent for nodes with small sets of known parent types