v0.29.0

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Features

• unstable: Add support for request cancellation (#​195) (d5197f9)

v0.28.1

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Bug Fixes

• Expose peer contexts from app connections (#​190) (d657310)

v0.28.0

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Features

• schema: Update to schema v1.14.0 (#​185) (3c619a7)

v0.27.1

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Bug Fixes

• node-adapter: Cap HTTP request body size (#​186) (3832d4c)
• node-adapter: harden Node adapter request parsing (220eae6)

v0.27.0

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This is a big release! We have rewritten the SDK to have a more ergonomic design for creating new agents and clients. You can read more in the Migration Guide for how to migrate.

For now, you will still have the old interfaces available to ease the migration, but they are deprecated and will be removed in a future release.

Features

• Experimental Streamable HTTP & WebSocket Transport (#​155) (d6a3d88)
• New SDK design (see MIGRATION_0.26_0.27.md) (#​181) (87e2df3)

v0.26.0

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Features

• schema: Update to v1.13.7 of the schema (#​179) (34885b6)

v0.25.1

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Bug Fixes

• cleanup zod generation (#​170) (be44483)
• Zod type inference errors (#​177) (d9fafa2)

v0.25.0

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Features

• schema: stabilize deleteSession (#​168) (2cc77af)

v0.24.0

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Features

• Add resilient schema deserialization (#​167) (5864e73)
• schema: Stabilize addl dirs and remove unstable model selectors (#​165) (fa6e302)

v0.23.0

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Features

• schema: Stabilize logout and update schema to v0.13.4 (#​163) (cfd900a)

v0.22.1

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Bug Fixes

• Event ordering (#​153) (7b63226)

v0.22.0

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Features

• unstable: Add session delete handling (#​152) (f9384f5)
• Update schema to v0.13.2 (#​150) (b15960b)

v0.21.1

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Bug Fixes

• emit .js extensions in generated schema barrel for nodenext consumers (#​146) (63b96db)

v0.21.0

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Features

• unstable: Add providers/* support (#​138) (e234c21)

v0.20.0

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Features

• Stabilize closeSession and resumeSession (#​132) (806d307)

v0.19.2

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Bug Fixes

• Avoid event loop timing causing out of order messages (#​130) (8f514f3)

v0.19.1

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Bug Fixes

• avoid spurious unhandledRejection when transport fails mid-sendRequest (#​122) (b6b2cb4)
• Flush decoder state at end of NDJSON stream (#​119) (4e1b07a)
• Use TypeScript private keyword instead of ES #private fields (#​127) (c6e6ee2)

v0.19.0

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Features

• unstable: Initial unstable elicitation support (#​113) (bf259e9)

v0.18.2

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Bug Fixes

• propagate input stream errors through ndJsonStream (#​111) (f57a8d1)

v0.18.1

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Bug Fixes

• Handle ACP connection transport failures cleanly (#​103) (028ee3f)

v0.18.0

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Features

• unstable: Add initial additionalDirectories and NES support (#​104) (43cde3b)

v0.17.1

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Bug Fixes

• Make sure we use zod/v4 path for imports (#​99) (e632d3b)

v0.17.0

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Features

• schema: Update schema to 0.11.3 (#​88) (0fe246e)

v0.16.1

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Bug Fixes

• unstable: Fixes for session/close capabilities (#​85) (e8721b7)

v0.16.0

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Features

• add unstable session/close (#​81) (2c9bc77)
• Stabilize unstable_listSessions to listSessions (#​84) (9e89bbc)

v0.15.0

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Features

• Update to 0.11.0 of the schema (#​79) (2763d63)

Bug Fixes

• use npx.cmd on Windows in client example (#​68) (fdc7815)

v0.14.1

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Bug Fixes

• inconsistent bigint vs number in zod and schema (#​66) (5e3c342)

v0.14.0

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Features

• Stabilize Session Config Options (#​64) (15806a2)

v0.13.1

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Bug Fixes

• schema: Update to schema v0.10.7 (#​58) (ade1b68)

v0.13.0

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Features

• (breaking) no more auto underscoring of extension methods (#​55) (ec4b095)
• add unstable session config option handling (#​56) (ec7bb47)
• Update to 0.10.6 of the schema (#​53) (766964e)

v0.12.0

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Features

• unstable: add list sessions method (#​47) (2efd404)
• Update to 0.10.4 of the schema (#​49) (6c44fb2)

v0.11.0

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Features

• unstable: add resumeSession support (#​41) (721c450)

v0.10.0

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Features

• Update to 0.10.2 of the schema (#​39) (0773dde)

v0.9.0

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Features

• Update to 0.10.1 of the schema (#​36) (210392b)
• Unstable: add unstable forkSession support (#​37) (16262ef
  )

v0.8.0

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Features

• Update to 0.10 of the schema (#​31) (f026432)

v0.7.0

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Features

• Update to v0.9.1 of the schema (#​28) (6166944)

v0.6.0

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Updates to the latest version of the ACP JSON Schema, v0.8.0

This update provides much improved schema interfaces. The migration should be minimal because in TypeScript the interfaces should be functionally equivalent. But there may be some areas where the types are now more informative to the compiler and will hopefully help you catch errors earlier.

v0.5.1

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• Add ability for agents and clients to provide information about their implementation
• Fix incorrectly serialized _meta field on SetSessionModeResponse

v0.5.0

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• Provide access to an AbortSignal and closed promise on connections so you can wait for the connection to close and handle any other cleanup tasks you need for a graceful shutdown. #​11
• Allow for more customization of error messages: #​12
• Update to latest ACP JSON Schema: #​10

v2.5.5

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Patch Changes

• #​10972 ab8c21b Thanks @​ematipico! - Fixed useExhaustiveSwitchCases for unions of bigint literals. The rule now reports missing bigint cases and compares bigint literals by value, including binary, octal, hexadecimal, and separator-containing spellings. For example, this switch now reports the missing 2n case:

  declare const value: 1n | 2n;
  switch (value) {
    case 1n:
      break;
  }

• #​10972 ab8c21b Thanks @​ematipico! - Fixed false positives in noBaseToString and useNullishCoalescing when member, stringification, or nullish inference cannot complete. These rules now suppress diagnostics instead of reporting from partial type information. For example, neither expression is reported when a recursive type cannot be fully resolved:

  type Recursive = Recursive;
  declare const value: Recursive;
  
  String(value);
  value || "fallback";

• #​10977 0bf7486 Thanks @​ematipico! - Fixed #​10922: the action useSortedAttributes no longer triggers for HTML instructions.

• #​10957 cf263c4 Thanks @​dyc3! - Fixed noThenProperty failing to detect Object.fromEntries, Object.defineProperty, and Reflect.defineProperty calls with comments between their tokens.

• #​10983 edc0ed7 Thanks @​ayaangazali! - Fixed #​10980: useAriaPropsSupportedByRole no longer reports false positives when the attribute that determines an element's implicit ARIA role is written as a shorthand attribute, such as <a {href} aria-label="..."> in Astro and Svelte files.

  Shorthand attributes are now taken into account when computing the implicit role, so the anchor above correctly resolves to the link role instead of generic.

• #​10889 89526e3 Thanks @​denbezrukov! - Fixed CSS formatter casing for syntax-owned names while preserving author-defined names, including scoped keyframes and container scroll-state queries.

  - A:HOVER { COLOR: INITIAL; }
  + A:hover { color: initial; }
  - @​KEYFRAMES :GLOBAL KeepFrames { FROM { COLOR: RED; } }
  + @​keyframes :GLOBAL KeepFrames { from { color: RED; } }
  - @​CONTAINER scroll-state((SCROLLED: TOP) AND (STUCK)) { A:HOVER { COLOR: RED; } }
  + @​container scroll-state((SCROLLED: TOP) AND (STUCK)) { A:hover { color: RED; } }

• #​10964 794ccd0 Thanks @​denbezrukov! - Fixed CSS formatting for comments between declaration values and !important.

  -a { color: /* before */ /* after */ red !important; }
  +a { color: /* before */ red /* after */ !important; }

• #​10993 b7a9694 Thanks @​denbezrukov! - Fixed the CSS formatter to preserve comments on the correct side of selector combinators and before declaration blocks.

  -.before > /* comment */ .after {}
  +.before /* comment */ > .after {}

  It now also keeps selectors with escaped newlines in attribute values inline when they fit.

  -div
  -  span[foo="bar\
  +div span[foo="bar\
   value"] {}

• #​10978 8ebafe1 Thanks @​ematipico! - Fixed #​10870: noUnresolvedImports no longer reports false positives such as import type { NextRequest } from "next/server".

• #​10901 68c10e6 Thanks @​Socialpranker! - Fixed #​10622: the HTML/Vue parser no longer panics on the argument-less v-bind shorthand (:="props").

  This syntax is valid Vue and equivalent to v-bind="props", so the parser now accepts it (along with the longhand v-bind:="props") instead of crashing while building a diagnostic for a missing argument.

• #​10936 7df46f5 Thanks @​ematipico! - Improved generic tuple inference for useIncludes. The rule now recognizes specialised tuple element types returned through generic aliases.

• #​10941 f787725 Thanks @​siketyan! - Fixed #10855: Biome now supports parsing and formatting CSS custom media queries declared with @custom-media.

• #​10969 72d309b Thanks @​ematipico! - Fixed an issue where Biome logs became too verbose, dumping information not relevant to user's operations.

• e62f6b6 Thanks @​ematipico! - Fixed #​10963: Biome no longer panics when a type-aware rule such as noFloatingPromises checks a call to a function with multiple call signatures imported from another module.

• #​10931 899c60d Thanks @​ematipico! - Fixed check --write command. Now the command reports code frame of the formatted code, if the formatter is enabled.

• #​10904 ceee4f4 Thanks @​qzwxsaedc! - Fixed #​10892: noUnnecessaryConditions no longer reports a false positive when checking a member of a discriminated union that is accessed through a default type-only namespace import. The following code is no longer flagged:

  import type Types from "./types";
  
  declare function parse(): Types.Result<string>;
  const result = parse();
  if (!result.success) {
  }

• #​10962 f0a67f2 Thanks @​ematipico! - Biome no longer removes embedded styles and scripts in HTML files.

• #​11000 5039a1e Thanks @​ematipico! - Fixed a bug where closing one editor stopped a shared Biome daemon used by other editors. LSP proxy processes now exit when either the editor or daemon disconnects.

• #​10957 cf263c4 Thanks @​dyc3! - Improved the performance of the noThenProperty lint rule by about 50%.

• #​10992 4bf9b21 Thanks @​ematipico! - Fixed noMisusedPromises: The rule now reports Promise-returning callbacks where a synchronous callback is expected when calls use tuple spreads or tuple rest parameters, including generic and deeply nested tuples, and when constructor signatures come from interface or object types. Recursive or excessively nested tuple spreads use a conservative fallback so analysis terminates.

  For example, the following callback is now reported.

  declare function consume(...args: [number, () => void]): void;
  const prefix: [number] = [1];
  
  consume(...prefix, async () => {});

• #​10915 b3b12b3 Thanks @​Functionhx! - Added the rule noNegationInEqualityCheck. The rule flags negated expressions on the left side of strict equality checks like !foo === bar — due to operator precedence this evaluates as (!foo) === bar which is almost always a mistake for foo !== bar.

  The rule provides an unsafe fix that flips the operator.

  // Invalid
  !foo === bar;
  !foo !== bar;
  
  // Valid
  foo !== bar;
  foo === bar;

• #​10970 bd1038b Thanks @​ematipico! - Improved overload selection for noMisusedPromises. Biome now handles overloaded calls, overloaded constructors, rest parameters, union arguments, and generic constraints without selecting an incompatible signature. For example, noMisusedPromises now reports the async callback passed to the synchronous overload:

  declare function consume(kind: "async", callback: () => Promise<void>): void;
  declare function consume(kind: "sync", callback: () => void): void;
  consume("sync", async () => {});

• #​10933 48a4abb Thanks @​ematipico! - Fixed useArrayFind to recognize bigint zero indexes.

• #​10931 899c60d Thanks @​ematipico! - Fixed an orchestration issue that could lead to deadlocks when type-aware rules are enabled.

• #​10969 72d309b Thanks @​ematipico! - Hardened the Biome Language Server by improving its synchronisation logic.

• #​10972 ab8c21b Thanks @​ematipico! - Fixed false positives in noMisusedPromises and useAwaitThenable when Promise or thenable inference cannot complete. These rules now suppress diagnostics instead of treating incomplete type information as a definite result. For example, useAwaitThenable no longer reports await value when the value's thenability is unknown:

  declare const value: unknown;
  
  async function consume() {
    await value;
  }

v2.5.4

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Patch Changes

• #​10665 55ff995 Thanks @​dyc3! - Improved the performance of the HTML parser slightly in our synthetic benchmarks.

• #​10894 f4fb10e Thanks @​ematipico! - Fixed #​6392: On-type formatting no longer moves comments before an if statement into its body.

• #​10939 f2799db Thanks @​Netail! - Fixed #​10930: noLabelWithoutControl now correctly detects text interpolation in Astro, Svelte & Vue as valid accessible content.

• #​10945 ae15d98 Thanks @​Netail! - Fixed #​10942: Svelte directives don't throw an accidental debug log anymore.

• #​10842 5e1abfe Thanks @​JamBalaya56562! - Fixed #​9196: biome check --write --unsafe no longer hangs forever when applying the noCommentText code fix.

  The rule's fix now wraps the comment in a real JSX expression container ({/* comment */}) instead of re-inserting the braces as plain JSX text, so the fixed code is no longer reported again by the same rule.

• #​10891 ecca79e Thanks @​ematipico! - Fixed #10885: prevented a module-inference regression introduced by a housekeeping change.

• #​10886 60c8043 Thanks @​dyc3! - Fixed #​10727: Biome now breaks the arguments of curried test.each, it.each, describe.each, and test.for calls when they exceed the configured line width.

  - test.each([[1, 2]])("a description that is long enough to push the hugged opening line beyond the print width", (a, b) => {
  -   expect(a).toBe(b);
  - });
  + test.each([[1, 2]])(
  +   "a description that is long enough to push the hugged opening line beyond the print width",
  +   (a, b) => {
  +     expect(a).toBe(b);
  +   },
  + );

• #​10895 01a85f0 Thanks @​ematipico! - Biome will now remove stale Unix daemon sockets from older Biome versions when starting a newer daemon.

v2.5.3

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Patch Changes

• #​10815 86613d5 Thanks @​WaterWhisperer! - Fixed a parser panic reported in #​10708: Biome now recovers when unsupported CSS Modules @value rules or scoped @keyframes names end at EOF.

• #​10534 da9b403 Thanks @​Mokto! - Fixed noUnusedVariables false positives in Svelte files: Svelte store subscriptions ($store references in templates now keep the underlying store binding from being flagged), and $bindable() props that are only written to in the script block (write-only is intentional for bindable props) are no longer reported as unused.

• #​10827 098ba41 Thanks @​Aqu1bp! - Fixed #​10698: The noUnsafeOptionalChaining rule now reports unsafe optional chains wrapped in TypeScript as, satisfies, type assertion, and instantiation expressions, such as new (value?.constructor as Constructor)().

• #​10773 3c6513d Thanks @​otkrickey! - Fixed #​10772: useVueValidVOn no longer reports a missing handler for v-on directives using a verb modifier (.stop / .prevent) without an expression, e.g. <div @&#8203;click.stop></div>. The rule also accepts the arg-less object syntax <div v-on="$listeners"></div> instead of reporting a missing event name.

• #​10721 d83c66b Thanks @​minseong0324! - Improved type-aware lint rule inference for built-in globals and indexed function calls. Biome now resolves Error(...), new Error(...), optional Error#stack, and calls through indexed function values such as handlers[0]() more accurately.

• #​10865 6450276 Thanks @​ematipico! - Fixed #​10845. Biome Language Server no longer goes in deadlock when the scanner is enabled.

• #​10853 93d8e53 Thanks @​Netail! - Fixed #​10840: Astro shorthand attribute syntax is now correctly being parsed from embedded nodes.

• #​10820 bba3092 Thanks @​JamBalaya56562! - Fixed #​10619: noProcessEnv now also reports computed (bracket) member access. Previously only dot access was checked, so process["env"] and env["NODE_ENV"] (where env is imported from node:process) were missed. Both static and computed accesses are now reported.

• #​10835 3447b2f Thanks @​dyc3! - Fixed #​10824: useDomQuerySelector now supports an ignore option for receiver identifiers that should not be reported.

• #​10875 b12e486 Thanks @​dyc3! - Fixed #​10795: --profile-rules now reports timings for each plugin separately as plugin/<pluginName>, matching the naming used by plugin suppressions, instead of aggregating all plugins under a single plugin/plugin entry.

• #​10877 d6bc447 Thanks @​ematipico! - Fixed biome-zed#164: Biome no longer inserts stray whitespace when format-on-type runs after closing delimiters such as ), ], and }.

• #​10867 a21463e Thanks @​dyc3! - Fixed #​10864: Biome no longer crashes when checking or linting HTML files with unquoted attribute values such as <textarea rows=4></textarea>.

v2.5.2

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Patch Changes

• #​10595 f458028 Thanks @​pkallos! - Added the option ignoreBooleanCoercion to useNullishCoalescing. When enabled, Biome ignores || and ||= used inside a Boolean() call, where coalescing on falsy values is intentional.

• #​10798 4a32b63 Thanks @​pkallos! - Added the option ignorePrimitives to useNullishCoalescing. When enabled, Biome ignores ||, ||=, and ternary expressions whose non-nullish operands are all primitives the option opts out of. Use true to ignore all primitives, or an object selecting string, number, boolean, or bigint.

• #​10545 f3d4c00 Thanks @​Mokto! - Added the new nursery rule noSvelteUnnecessaryStateWrap, which reports unnecessary $state() wrapping of classes from svelte/reactivity that are already reactive.

  <script>
  import { SvelteMap } from "svelte/reactivity";
  const map = $state(new SvelteMap()); // redundant
  </script>

• #​10752 f62fb8b Thanks @​ematipico! - Fixed #​10739. Now the rule useValidAutocomplete correctly flags the autoComplete attribute.

• #​10796 f1b3ab2 Thanks @​ematipico! - Fixed #​10768. Improved the performance of the Biome Language Server by cancelling certain in-flight operations when there are fast updates.

• #​10719 aa649b5 Thanks @​minseong0324! - Fixed noMisleadingReturnType false positive on returns that use a widening type assertion: "a" as string is no longer reported as misleading. The rule now also reports a literal-pinning assertion such as false as false, matching the existing as const behavior

✂ Note

PR body was truncated to here.