[dependabot]

Bumps the npm-dependencies group with 131 updates in the / directory:

Package	From	To
@types/estree	1.0.8	1.0.10
@typescript-eslint/parser	6.21.0	8.72.1
eslint	8.57.1	10.14.0
eslint-config-prettier	9.1.2	10.1.8
eslint-plugin-headers	1.2.1	1.3.5
flow-bin	0.314.0	0.338.0
glob	10.5.0	14.0.3
hermes-eslint	0.36.1	0.37.0
husky	8.0.3	9.1.7
jest	30.2.0	30.5.2
jest-environment-jsdom	30.2.0	30.5.2
lint-staged	13.3.0	17.6.0
prettier	3.5.3	3.9.10
prettier-plugin-hermes-parser	0.36.1	0.37.0
yargs	17.7.2	18.2.0
@csstools/css-tokenizer	3.0.4	4.0.2
@babel/cli	7.28.3	8.1.0
@babel/core	7.28.5	8.1.0
@babel/node	7.28.0	8.0.6
@babel/eslint-parser	7.28.5	8.0.7
@babel/plugin-syntax-flow	7.27.1	8.0.1
@babel/preset-env	7.28.5	8.0.7
@babel/preset-flow	7.27.1	8.0.1
@babel/preset-react	7.28.5	8.0.1
@babel/preset-typescript	7.28.5	8.0.7
@babel/types	7.29.0	7.29.7
@rollup/plugin-alias	5.1.1	6.0.1
@rollup/plugin-babel	6.1.0	7.1.0
@rollup/plugin-commonjs	26.0.3	29.0.3
@rollup/plugin-node-resolve	15.3.1	16.0.3
@rollup/plugin-replace	5.0.7	6.0.3
babel-plugin-syntax-hermes-parser	0.36.1	0.37.0
rollup	4.59.0	4.67.4
@babel/helper-module-imports	7.27.1	7.29.7
@babel/traverse	7.28.5	7.29.7
@babel/plugin-syntax-jsx	7.27.1	8.0.1
@babel/plugin-syntax-typescript	7.27.1	8.0.3
browserslist	4.28.0	4.29.5
lightningcss	1.32.0	1.33.0
ansis	3.17.0	4.5.0
fb-watchman	2.0.2	2.0.4
fs-extra	11.3.2	11.4.1
@clack/prompts	0.11.0	1.8.1
giget	2.0.0	3.3.1
postcss-selector-parser	7.1.6	7.1.7
react	19.2.3	19.3.1
@types/react	19.2.17	19.3.0
react-dom	19.2.3	19.3.1
@types/react-dom	19.2.3	19.3.0
@babel/plugin-transform-flow-strip-types	7.27.1	8.0.1
jszip	3.10.1	3.10.2
web-ext	10.5.0	10.8.0
postcss	8.5.23	8.5.32
terser	5.44.1	5.51.2
@babel/standalone	7.28.5	8.1.1
feed	4.2.2	6.0.0
algoliasearch	5.46.2	5.61.0
marked	17.0.1	18.1.3
fumadocs-core	16.0.11	16.17.10
fumadocs-mdx	13.0.8	15.4.10
fumadocs-ui	16.0.11	16.17.10
react-server-dom-webpack	19.2.6	19.3.1
waku	1.0.0-alpha.0	1.0.0-rc.4
zod	4.6.6	4.6.7
@radix-ui/react-scroll-area	1.2.10	1.4.0
@radix-ui/react-collapsible	1.1.12	1.2.1
@radix-ui/react-presence	1.1.5	1.1.11
@radix-ui/react-popover	1.1.15	1.3.1
@radix-ui/react-navigation-menu	1.2.14	1.4.1
lucide-react	0.553.0	1.66.0
@types/mdx	2.0.13	2.0.14
@types/node	22.19.1	26.6.6
@types/react	19.2.17	19.3.0
@types/react-dom	19.2.3	19.3.0
typescript	5.9.3	7.0.2
unplugin	2.3.11	3.7.0
vite	7.3.7	8.3.5
vite-tsconfig-paths	5.1.4	6.1.1
flow-api-translator	0.36.1	0.338.0
esbuild	0.27.1	0.28.2
next	16.4.1	16.4.4
autoprefixer	10.4.22	10.6.2
eslint-config-next	16.0.7	16.4.4
@remix-run/node-fetch-server	0.12.0	1.0.0
express	5.2.1	5.3.0
react-router	8.3.0	8.5.1
@vitejs/plugin-react	4.7.0	6.2.1
capnweb	0.2.0	0.12.0
rwsdk	1.0.0-beta.31	1.7.5
@cloudflare/vite-plugin	1.17.0	1.67.0
@cloudflare/workers-types	4.20260619.1	5.20261103.1
wrangler	4.53.0	4.156.1
serve	14.2.5	14.2.6
@rspack/cli	1.6.6	2.3.0
@rspack/core	1.6.6	2.3.0
css-loader	7.1.2	7.1.5
@chromatic-com/storybook	4.1.2	5.6.0
@storybook/addon-a11y	9.1.16	10.6.5
@storybook/addon-docs	9.1.16	10.6.5
@storybook/addon-links	9.1.16	10.6.5
@storybook/addon-vitest	9.1.21	10.6.5
@storybook/react-vite	9.1.16	10.6.5
@typescript-eslint/eslint-plugin	8.46.4	8.72.1
@vitest/browser	4.0.18	5.1.0
@vitest/coverage-v8	4.0.18	5.1.0
eslint-plugin-storybook	9.1.16	10.6.5
playwright	1.56.1	1.64.1
postcss-nesting	13.0.2	14.0.3
rollup-plugin-node-externals	8.1.2	9.0.1
storybook	9.1.21	10.6.5
typescript-eslint	8.61.1	8.72.1
vite-plugin-dts	4.5.4	5.1.2
vitest	4.1.11	5.1.0
@eslint/js	9.39.1	9.39.4
@sveltejs/adapter-auto	7.0.1	8.0.0
@sveltejs/adapter-vercel	5.10.3	7.0.2
@sveltejs/kit	2.66.0	3.1.1
@sveltejs/vite-plugin-svelte	6.2.4	7.3.1
eslint-plugin-svelte	3.19.0	3.23.1
globals	16.5.0	17.14.0
svelte	5.56.3	5.57.3
svelte-check	4.6.0	4.7.8
eslint-plugin-react-hooks	5.2.0	7.1.1
eslint-plugin-react-refresh	0.4.24	0.5.7
rsc-html-stream	0.0.7	0.0.8
@pmmmwh/react-refresh-webpack-plugin	0.6.1	0.6.3
babel-loader	10.0.0	10.1.1
html-webpack-plugin	5.6.4	5.6.8
mini-css-extract-plugin	2.9.4	2.10.2
react-refresh	0.18.0	0.19.0
webpack	5.102.1	5.112.2
webpack-cli	6.0.1	7.3.1
webpack-dev-server	5.2.6	6.1.0
@eslint/js	9.39.1	9.39.4
@sveltejs/adapter-auto	7.0.1	8.0.0
@sveltejs/adapter-vercel	5.10.3	7.0.2
@sveltejs/kit	2.66.0	3.1.1
@sveltejs/vite-plugin-svelte	6.2.4	7.3.1
eslint	8.57.1	10.14.0
eslint-plugin-svelte	3.19.0	3.23.1
globals	16.5.0	17.14.0
svelte	5.56.3	5.57.3
svelte-check	4.6.0	4.7.8
typescript	5.9.3	7.0.2
typescript-eslint	8.61.1	8.72.1
vite	7.3.7	8.3.5
react	19.2.3	19.3.1
react-dom	19.2.3	19.3.1
@eslint/js	9.39.1	9.39.4
@types/node	22.19.1	26.6.6
@types/react	19.2.17	19.3.0
@types/react-dom	19.2.3	19.3.0
@vitejs/plugin-react	4.7.0	5.1.1
eslint	8.57.1	10.14.0
eslint-plugin-react-hooks	5.2.0	7.1.1
eslint-plugin-react-refresh	0.4.24	0.5.7
globals	16.5.0	17.14.0
typescript	5.9.3	7.0.2
typescript-eslint	8.61.1	8.72.1
vite	7.3.7	8.3.5

Bumps the npm-dependencies group with 1 update in the /examples/example-sveltekit directory: @eslint/js.
Bumps the npm-dependencies group with 1 update in the /examples/example-vite-react directory: @eslint/js.

Updates @types/estree from 1.0.8 to 1.0.10

Commits

• See full diff in compare view

Updates @typescript-eslint/parser from 6.21.0 to 8.72.1

Release notes

Sourced from @​typescript-eslint/parser's releases.

v8.72.1

8.72.1 (2026-10-26)

🩹 Fixes

• eslint-plugin: [no-unnecessary-condition] false positives on unresolved conditional types (#13062)
• eslint-plugin: [no-unnecessary-type-assertion] bound recursive type traversal instead of catching stack overflows (#13039)
• typescript-estree: use one Program per tsconfig for the project service in single-run mode (#12988)

❤️ Thank You

• Evyatar Daud @​StyleShit
• Josh Ghoulberg 👻

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

v8.72.0

8.72.0 (2026-10-19)

🚀 Features

• eslint-plugin: lazy load rules (#13010)
• eslint-plugin: [await-thenable] add allowMixedPromiseArrays option (#12992)
• typescript-estree: error on abstract keyword that precedes export (#13019)

🩹 Fixes

• ast-spec: add JSXFragment to JSXAttribute['value'] (#13051)
• eslint-plugin: [prefer-readonly-parameter-types] check where allowed type aliases are declared (#13016)
• eslint-plugin: [no-deprecated] report deprecated properties in object literals (#12704)
• eslint-plugin: use isTypeLiteralType instead of type.isLiteral() to include bigint literals on TS < 5.0 (#13053)
• eslint-plugin: [require-array-sort-compare] check tuples (#13058)
• eslint-plugin: [require-array-sort-compare] ignore extra this type argument on TS < 5.1 (#13055)
• type-utils: discriminateAnyType crashes when calling getAwaitedType on awaited type in TS < 5.0 (#13054)
• typescript-estree: include leading and trailing comments & whitespace in Program range (#12991)

❤️ Thank You

• Evyatar Daud @​StyleShit
• Junichiro Kasuya @​jksy
• Mitch Fultz @​fitchmultz
• Shaan GS @​ShaanGS

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

v8.71.2

... (truncated)

Changelog

Sourced from @​typescript-eslint/parser's changelog.

8.72.1 (2026-10-26)

This was a version bump only for parser to align it with other projects, there were no code changes.

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.72.0 (2026-10-19)

This was a version bump only for parser to align it with other projects, there were no code changes.

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.71.2 (2026-10-12)

This was a version bump only for parser to align it with other projects, there were no code changes.

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.71.1 (2026-10-05)

This was a version bump only for parser to align it with other projects, there were no code changes.

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.71.0 (2026-09-28)

This was a version bump only for parser to align it with other projects, there were no code changes.

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.70.1 (2026-09-21)

This was a version bump only for parser to align it with other projects, there were no code changes.

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.70.0 (2026-09-07)

... (truncated)

Commits

• 4ad6b75 chore(release): publish 8.72.1
• 7757694 chore: cleanup typecheck & build and fix race condition (#13071)
• a4c2603 chore(release): publish 8.72.0
• 7488d68 chore(release): publish 8.71.2
• d57b8da chore(release): publish 8.71.1
• 8695664 chore(release): publish 8.71.0
• 23d38ce chore(release): publish 8.70.1
• 7ee7608 chore(release): publish 8.70.0
• 9a6e546 chore(release): publish 8.69.0
• 8f4e00a chore(release): publish 8.68.0
• Additional commits viewable in compare view

Maintainer changes

This version was pushed to npm by GitHub Actions, a new releaser for @​typescript-eslint/parser since your current version.

Updates eslint from 8.57.1 to 10.14.0

Release notes

Sourced from eslint's releases.

v10.14.0

Features

• d23a7f9 feat: fix property descriptor handling in func-name-matching (#21400) (xbinaryx)

Bug Fixes

• 4a12580 fix: require minimatch 10.2.6 to avoid vulnerable brace-expansion (#21460) (lumir)
• 827a8f3 fix: no-restricted-globals crash on global objects as property values (#21449) (xbinaryx)
• 161558a fix: handle LS, PS and empty hashbang comments (#21419) (lumir)
• 6194939 fix: no-invalid-this crash on accessor fields without initializer (#21442) (xbinaryx)
• 9155e14 fix: Update @​humanfs/node dependency version (#21434) (Nicholas C. Zakas)
• cb2b9d4 fix: avoid invalid object-shorthand fixes for super methods (#21323) (dvd233)
• 5ee3915 fix: yoda invalid autofix at statement start (#21424) (Daniel Pinto)

Documentation

• 0f94f47 docs: remove zh-hans from docs language switcher (#21437) (lumir)
• dab466e docs: Update README (GitHub Actions Bot)
• 97431f8 docs: replace --rulesdir with a virtual plugin in custom rules docs (#21452) (Pixel)
• 7697550 docs: Update README (GitHub Actions Bot)
• 0c699d5 docs: Remove Tidelift commercial support (#21416) (Milos Djermanovic)
• 0880666 docs: update loadESLint() documentation for v10 (#21374) (Minseon Kim)
• e06fe87 docs: Revise AI acknowledgment options in PR template (#21414) (Nicholas C. Zakas)

Chores

• 0e2ab70 ci: disable eslint-plugin-unicorn ecosystem test (#21462) (Francesco Trotta)
• 6e3f988 chore: update github/codeql-action action to v4.39.1 (#21450) (renovate[bot])
• a031c40 chore: update ecosystem plugins (#21445) (ESLint Bot)
• 67d2ca2 chore: add troubleshooting page URL to circular fixes warning message (#21429) (Milos Djermanovic)
• 276021d chore: update github/codeql-action action to v4.39.0 (#21432) (renovate[bot])
• 449724e chore: update ecosystem plugins (#21420) (ESLint Bot)
• 8ffeb8c chore: update dependency prettier to v3.9.10 (#21417) (renovate[bot])

v10.13.0

Features

• 48d5cc4 feat: report references inside IIFEs in no-use-before-define (#21238) (Irfan fandi)
• a39d9fb feat: add globalThis to no-obj-calls (#21382) (synthex-byte)
• 66ac583 feat: check yield* expressions in no-unsafe-optional-chaining (#21399) (xbinaryx)

Bug Fixes

• 87bd2ce fix: avoid redeclared let when no-var and one-var fix together (#21389) (Daniel Pinto)

Documentation

• 4783a68 docs: Update README (GitHub Actions Bot)
• 43f0ac9 docs: clarify parameter description in getText (#21287) (lumir)

Chores

• b59d889 chore: update github/codeql-action action to v4.38.3 (#21412) (renovate[bot])
• 95e51a0 ci: re-enable @typescript-eslint/typescript-eslint in ecosystem tests (#21410) (Francesco Trotta)
• 317fcb3 chore: update ecosystem plugins (#21409) (ESLint Bot)
• b92decf perf: skip no-redeclare scan for single-declaration variables (#21365) (James Ross)
• 47b7063 chore: update dependency @​eslint/json to ^2.1.1 (#21398) (renovate[bot])

... (truncated)

Commits

• 12cbff4 10.14.0
• 6b696e7 Build: changelog update for 10.14.0
• 0e2ab70 ci: disable eslint-plugin-unicorn ecosystem test (#21462)
• 4a12580 fix: require minimatch 10.2.6 to avoid vulnerable brace-expansion (#21460)
• 0f94f47 docs: remove zh-hans from docs language switcher (#21437)
• dab466e docs: Update README
• 827a8f3 fix: no-restricted-globals crash on global objects as property values (#21449)
• 97431f8 docs: replace --rulesdir with a virtual plugin in custom rules docs (#21452)
• 6e3f988 chore: update github/codeql-action action to v4.39.1 (#21450)
• 161558a fix: handle LS, PS and empty hashbang comments (#21419)
• Additional commits viewable in compare view

Maintainer changes

This version was pushed to npm by eslintbot, a new releaser for eslint since your current version.

Updates eslint-config-prettier from 9.1.2 to 10.1.8

Release notes

Sourced from eslint-config-prettier's releases.

v10.1.8

republish latest version

Full Changelog: prettier/eslint-config-prettier@v10.1.5...v10.1.8

v10.1.5

Patch Changes

• #332 60fef02 Thanks @​JounQin! - chore: add funding field into package.json

Full Changelog: prettier/eslint-config-prettier@v10.1.4...v10.1.5

v10.1.4

Patch Changes

• #328 94b4799 Thanks @​silvenon! - fix(cli): do not crash on no rules configured

Full Changelog: prettier/eslint-config-prettier@v10.1.3...v10.1.4

v10.1.3

Patch Changes

• #325 4e95a1d Thanks @​pilikan! - fix: this package is commonjs, align its types correctly

New Contributors

• @​pilikan made their first contribution in prettier/eslint-config-prettier#325

Full Changelog: prettier/eslint-config-prettier@v10.1.2...v10.1.3

v10.1.2

Patch Changes

• #321 a8768bf Thanks @​Fdawgs! - chore(package): add homepage for some 3rd-party registry - see #321 for more details

v10.1.1

Patch Changes

• #309 eb56a5e Thanks @​JounQin! - fix: separate the /flat entry for compatibility

  For flat config users, the previous "eslint-config-prettier" entry still works, but "eslint-config-prettier/flat" adds a new name property for config-inspector, we just can't add it for the default entry for compatibility.

  See also prettier/eslint-config-prettier#308

  // before
  import eslintConfigPrettier from "eslint-config-prettier";
  // after
  import eslintConfigPrettier from "eslint-config-prettier/flat";

... (truncated)

Changelog

Sourced from eslint-config-prettier's changelog.

eslint-config-prettier

10.1.5

Patch Changes

• #332 60fef02 Thanks @​JounQin! - chore: add funding field into package.json

10.1.4

Patch Changes

• #328 94b4799 Thanks @​silvenon! - fix(cli): do not crash on no rules configured

10.1.3

Patch Changes

• #325 4e95a1d Thanks @​pilikan! - fix: this package is commonjs, align its types correctly

10.1.2

Patch Changes

• #321 a8768bf Thanks @​Fdawgs! - chore(package): add homepage for some 3rd-party registry - see #321 for more details

10.1.1

Patch Changes

• #309 eb56a5e Thanks @​JounQin! - fix: separate the /flat entry for compatibility

  For flat config users, the previous "eslint-config-prettier" entry still works, but "eslint-config-prettier/flat" adds a new name property for config-inspector, we just can't add it for the default entry for compatibility.

  See also prettier/eslint-config-prettier#308

  // before
  import eslintConfigPrettier from "eslint-config-prettier";
  // after
  import eslintConfigPrettier from "eslint-config-prettier/flat";

10.1.0

Minor Changes

• #306 56e2e34 Thanks @​JounQin! - feat: migrate to exports field

... (truncated)

Commits

• See full diff in compare view

Updates eslint-plugin-headers from 1.2.1 to 1.3.5

Release notes

Sourced from eslint-plugin-headers's releases.

v1.3.5

What's Changed

• fix: disallow extra properties in rule options by @​andreww2012 in robmisasi/eslint-plugin-headers#15
• Export index as ESLint's Plugin type for JSDoc by @​mondeja in robmisasi/eslint-plugin-headers#13

New Contributors

• @​andreww2012 made their first contribution in robmisasi/eslint-plugin-headers#15
• @​mondeja made their first contribution in robmisasi/eslint-plugin-headers#13

Full Changelog: robmisasi/eslint-plugin-headers@v1.3.4...v1.3.5

v1.3.4

• Support ESLint 10.

Full Changelog: robmisasi/eslint-plugin-headers@v1.3.3...v1.3.4

v1.3.3

• Fix behavior where content between final pattern and end of header would not be escaped. Allow patterns and variables to be used in prefixes and suffixes.

Full Changelog: robmisasi/eslint-plugin-headers@v1.3.2...v1.3.3

v1.3.2

• Fix lines not getting escaped properly, leading to unintended regular expression syntax parsing.

Full Changelog: robmisasi/eslint-plugin-headers@v1.3.1...v1.3.2

v1.3.1

• Fix crash that could occur when a pair of parens appeared on a line when patterns were not configured.

Full Changelog: robmisasi/eslint-plugin-headers@v1.3.0...v1.3.1

v1.3.0

• Add support for validating regular expressions.

Full Changelog: robmisasi/eslint-plugin-headers@v1.2.1...v1.3.0

Commits

• 1fcaa26 1.3.5
• 43ff927 Export index as ESLint's Plugin type for JSDoc (#13)
• be8f36c fix: disallow extra properties in rule options (#15)
• da79918 Update dependencies.
• 1dfb996 Update dependencies.
• c8f8537 1.3.4
• 7a1f7a0 Tweak AST traversal to support ESLint 10. Update dev dependencies.
• d31dee9 Update dev dependencies.
• 4abff60 1.3.3
• 41225ad Allow patterns and variables to be used in configured prefixes and suffixes. ...
• Additional commits viewable in compare view

Updates flow-bin from 0.314.0 to 0.338.0

Release notes

Sourced from flow-bin's releases.

v0.338.0

Breaking Changes:

• Flowconfig option experimental.assertion_functions is removed. Assertion functions have been on by default and the option only accepted true since 0.337.
• Flowconfig option experimental.disable_invariant_special_casing is removed. It has been on by default and only accepted true since 0.337.
• Flowconfig option experimental.function_and_object_type_is_no_longer_any is removed. It has been on by default and only accepted true for a while.
• Flowconfig option experimental.builtin_ts_libdef_dynamic_discovery is removed. It has been on by default and only accepted true.
• Flowconfig option experimental.declare_global_support is removed. It has been on by default and only accepted true.

Likely to cause new Flow errors:

• Readonly, Partial, Required, $Exact, Omit and mapped types over an interface now include its methods and the members it inherits.
• Type guards now refine Array<any>, {data: any}, Map<string, any> and similar types to the guarded type, e.g. Array<string>, which can surface errors in code that relied on any.
• Static members can no longer reference the type parameters of their class, like in TypeScript, and reading a static member of a generic class no longer infers them.
• keyof of an object with a template literal indexer no longer widens the indexer key to string in conditional types like Exclude.

New Features:

• Mapped types over arrays and tuples support readonly and writeonly modifiers.
• Property truthiness checks such as if (result.done) now refine unions of classes and interfaces by fields with literal types, as === checks already did.
• Type guards narrow through optional calls such as isString?.(x). When the callee or receiver is nullable, only the true branch narrows.
• Support optional assertion calls when their declared types guarantee the call runs.
• Added the intrinsic ExactObjectType, the supertype of every exact object type and a subtype of {...}.

Notable bug fixes:

• Fix crashes and false recursive-definition errors from cyclic type star exports in TypeScript declarations.
• Support namespace export aliases and ambient exported members in TypeScript definitions.
• Allow classes to extend a constructor whose overloads are not all generic, such as Uint8Array<ArrayBuffer>.
• Casting a value whose type intersects an enum with other types (e.g. E & E) to the enum's representation type no longer errors.
• Arrays can be assigned to variables and parameters whose type was inferred from new Array<T>(...).
• Report delegated yield type errors at the yield expression.
• Align Try Flow's default lints and declare global support with regular Flow.
• Improve inference for generic values passed to polymorphic operations.
• Fix Try Flow initialization after the async builtin migration while preserving older releases' library definitions.
• Report conditional type instantiation errors at the caller.
• Apply type-parameter defaults when omitted optional or nullable arguments are the only evidence for them.
• An object with an indexer is no longer checked against optional properties it doesn't declare of a TypeScript-declared (.d.ts) object type, matching TypeScript.
• Fewer underconstrained-implicit-instantiation errors for generic calls passed as arguments to other generic calls.
• Fixed a crash when printing long types that contain non-ASCII names in error messages.
• Tuple types with a spread keep the variance of their own elements, e.g. a in [readonly a: unknown, ...T] stays read-only.
• First in [infer First, ...infer Rest] is now inferred instead of unknown.
• Fixed a deadlock in the Flow server monitor that could make all subsequent commands fail with "Out of retries, exiting!".
• Type guards with a union type now refine union members precisely, e.g. a falsy-value guard on string | number refines to "" | 0.
• Type guards now drop union members that are instances of classes unrelated to the guarded class, e.g. x: A | B refined by x is A is now A rather than A | (A & B).
• The negative branch of a type guard now refines away generics that satisfy the guard, e.g. x: T | number refined by !isT(x) with isT: (x: unknown) => x is T is now number.
• In the negative branch of a type guard, any now stays any instead of becoming empty, and boolean is refined to the literal the guard does not cover.
• Correct stdin behavior for flow check-contents and flow autocomplete.
• Error messages print code that contains backticks, such as template literals, as markdown code spans.
• Instances of TypeScript-declared generics, such as React.MouseEvent<T>, now compare type parameters without a variance annotation covariantly, as type applications already did.
• Type guards now drop tuple members of a different length and array members with disjoint element types.
• Type guards now drop object and interface union members whose properties conflict with the guard type.
• x instanceof C no longer refines a value of an intersection type to empty.
• Linux release builds use jemalloc, which keeps the memory of long-running servers from growing after large rechecks.

... (truncated)

Changelog

Sourced from flow-bin's changelog.

0.338.0

Breaking Changes:

• Flowconfig option experimental.assertion_functions is removed. Assertion functions have been on by default and the option only accepted true since 0.337.
• Flowconfig option experimental.disable_invariant_special_casing is removed. It has been on by default and only accepted true since 0.337.
• Flowconfig option experimental.function_and_object_type_is_no_longer_any is removed. It has been on by default and only accepted true for a while.
• Flowconfig option experimental.builtin_ts_libdef_dynamic_discovery is removed. It has been on by default and only accepted true.
• Flowconfig option experimental.declare_global_support is removed. It has been on by default and only accepted true.

Likely to cause new Flow errors:

• Readonly, Partial, Required, $Exact, Omit and mapped types over an interface now include its methods and the members it inherits.
• Type guards now refine Array<any>, {data: any}, Map<string, any> and similar types to the guarded type, e.g. Array<string>, which can surface errors in code that relied on any.
• Static members can no longer reference the type parameters of their class, like in TypeScript, and reading a static member of a generic class no longer infers them.
• keyof of an object with a template literal indexer no longer widens the indexer key to string in conditional types like Exclude.

New Features:

• Mapped types over arrays and tuples support readonly and writeonly modifiers.
• Property truthiness checks such as if (result.done) now refine unions of classes and interfaces by fields with literal types, as === checks already did.
• Type guards narrow through optional calls such as isString?.(x). When the callee or receiver is nullable, only the true branch narrows.
• Support optional assertion calls when their declared types guarantee the call runs.
• Added the intrinsic ExactObjectType, the supertype of every exact object type and a subtype of {...}.

Notable bug fixes:

• Fix crashes and false recursive-definition errors from cyclic type star exports in TypeScript declarations.
• Support namespace export aliases and ambient exported members in TypeScript definitions.
• Allow classes to extend a constructor whose overloads are not all generic, such as Uint8Array<ArrayBuffer>.
• Casting a value whose type intersects an enum with other types (e.g. E & E) to the enum's representation type no longer errors.
• Arrays can be assigned to variables and parameters whose type was inferred from new Array<T>(...).
• Report delegated yield type errors at the yield expression.
• Align Try Flow's default lints and declare global support with regular Flow.
• Improve inference for generic values passed to polymorphic operations.
• Fix Try Flow initialization after the async builtin migration while preserving older releases' library definitions.
• Report conditional type instantiation errors at the caller.
• Apply type-parameter defaults when omitted optional or nullable arguments are the only evidence for them.
• An object with an indexer is no longer checked against optional properties it doesn't declare of a TypeScript-declared (.d.ts) object type, matching TypeScript.
• Fewer underconstrained-implicit-instantiation errors for generic calls passed as arguments to other generic calls.
• Fixed a crash when printing long types that contain non-ASCII names in error messages.
• Tuple types with a spread keep the variance of their own elements, e.g. a in [readonly a: unknown, ...T] stays read-only.
• First in [infer First, ...infer Rest] is now inferred instead of unknown.
• Fixed a deadlock in the Flow server monitor that could make all subsequent commands fail with "Out of retries, exiting!".
• Type guards with a union type now refine union members precisely, e.g. a falsy-value guard on string | number refines to "" | 0.
• Type guards now drop union members that are instances of classes unrelated to the guarded class, e.g. x: A | B refined by x is A is now A rather than A | (A & B).
• The negative branch of a type guard now refines away generics that satisfy the guard, e.g. x: T | number refined by !isT(x) with isT: (x: unknown) => x is T is now number.
• In the negative branch of a type guard, any now stays any instead of becoming empty, and boolean is refined to the literal the guard does not cover.
• Correct stdin behavior for flow check-contents and flow autocomplete.
• Error messages print code that contains backticks, such as template literals, as markdown code spans.
• Instances of TypeScript-declared generics, such as ...

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