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oxc-guard f799f174b5 release(crates): oxc v0.157.0 (#28719 )

### 🚀 Features

- 8dd67a6 transform-react: Expose TypeScript transform options (Tomas Särnhammar)
- deed7dc parser: More friendly error for duplicate import attribute key (#28262) (sapphi-red)

### 🐛 Bug Fixes

- eaa8e90 ecmascript: Avoid numeric `+` folding when an operand may be a string (#28544) (camc314)
- b03c7b8 regular_expression: Allow incomplete oversized legacy quantifiers (#28449) (Boshen)
- 128c67d semantic: Check strict eval and arguments writes by reference flags (#28445) (Boshen)
- c97c43c parser: Reject TypeScript default exports in JavaScript (#28440) (Boshen)
- fdd119f span: Count Unicode characters when filtering typo suggestions (#28452) (Boshen)
- cb64638 regular_expression: Reject incomplete Unicode atom escapes (#28448) (Boshen)
- fc0eed3 semantic: Stop let-binding scans at arrow functions (#28444) (Boshen)
- 3421516 parser: Preserve default import names in reexports (#28442) (Boshen)
- a1e7e5f parser: Reject optional class members in JavaScript (#28439) (Boshen)
- 5b9a7bc parser: Parse sloppy let expressions and labels (#28438) (Boshen)
- 8e61652 regex: Reject templates without cooked values (#28345) (Boshen)
- 3b36543 parser: Preserve in-context after TypeScript type arguments (#28300) (Boshen)
- 2e3126c regex: Decode constructor patterns and flags consistently (#28298) (Boshen)
- 8a90be2 regex: Track capture groups and disjunction identity (#28297) (Boshen)
- 3dc2cb0 regex: Preserve escape values and boundaries (#28296) (Boshen)
- fc8acbc parser: Handle leading-zero numeric exponents (#28295) (Boshen)
- 91a638d parser: Normalize raw template line endings with invalid escapes (#28285) (Boshen)
- 2ac9a42 parser: Allow parenthesized private-in expressions (#28284) (Boshen)
- 052bca9 ast: Prevent greyed out fields in AST types in IDEs (#28335) (overlookmotel)
- ed7df7d ast/estree: Include comments in TS Program span (#28326) (camc314)

### ⚡ Performance

- 9b6b7bf regular_expression: Advance validated Unicode escapes directly (#28514) (Boshen)
- 82e1982 regular_expression: Share Unicode property name prefixes (#28513) (Boshen)
- 5395a40 regular_expression: Parse class set character prefixes once (#28512) (Boshen)
- 3708934 regular_expression: Defer literal range dash allocation (#28511) (Boshen)
- d85ee3d semantic: Skip arguments ancestry checks outside classes (#28510) (Boshen)
- cf81d07 semantic: Reuse private reference resolution (#28509) (Boshen)
- a79eebc semantic: Avoid duplicate maps for public JavaScript members (#28508) (Boshen)
- 235ca3b semantic: Skip escape checks for unescaped strings (#28507) (Boshen)
- babf44c parser: Reuse shorthand assignment target identifiers (#28504) (Boshen)
- 444f24a ecmascript: Short-circuit simple parameter checks for rest (#28503) (Boshen)
- 04b20c0 semantic: Compute duplicate parameter policy once per list (#28446) (Boshen)
- dbf8482 parser: Use token lookahead for simple function types (#28489) (Boshen)
- bca1275 parser: Avoid unused destructuring rest capacity (#28499) (Boshen)
- 691be5c parser: Compact cover initialized name storage (#28495) (Boshen)
- b3b5444 parser: Build simple arrow bindings directly (#28493) (Boshen)
- e1c9baf parser: Disambiguate single-identifier arrow heads (#28491) (Boshen)
- 550e98a regular_expression: Avoid rescanning unique capture names (#28450) (Boshen)
- 10e9fc7 parser: Skip duplicate lookup for singleton import attributes (#28441) (Boshen)
- 5238839 parser: Use a stack buffer for float separators (#28435) (Boshen)
- 6e35e3c parser: Fast-path leaf expressions before delimiters (#28432) (Boshen)
- 3d7512c parser: Decode Unicode identifiers once (#28414) (Boshen)
- 30f59f4 parser: Factor object type opening brace (#28430) (Boshen)
- 028a267 parser: Always inline postfix update parsing (#28429) (Boshen)
- 1b5a171 parser: Reuse export kind classification (#28424) (Boshen)
- 179a432 parser: Factor return type identifier parsing (#28416) (Boshen)
- 553dd1d parser: Inline hot paths and fold function dispatch (#28404) (Boshen)
- de75d56 parser: Combine parenthesized arrow lookahead (#28412) (Boshen)
- a768a0c parser: Reuse comment annotations after rewind (#28408) (Boshen)
- 563d92a parser: Skip redundant source cursor updates (#28409) (Boshen)
- 7941ca9 parser: Factor tuple identifier parsing (#28398) (Boshen)
- 426c151 parser: Construct completed tokens without intermediate writes (#28291) (Boshen)
- df42953 minifier: Don't request another pass for block unwrapping (#28315) (Dunqing)
- c2d663d parser: Avoid vectors for single parenthesized expressions (#28374) (Boshen)
- 50bd0a9 parser: Size delimited lists after the first element (#28373) (Boshen)
- bd869b5 parser: Bypass redundant operand parsing (#28372) (Boshen)
- 455fc09 parser: Skip keyword checks for plain identifier expressions (#28371) (Boshen)
- 61303fb parser: Fast-path identifier operands (#28306) (Boshen)
- 6cf5b1a parser: Guard arrow and conditional parsing (#28305) (Boshen)
- 3666939 parser: Specialize identifier reference parsing (#28303) (Boshen)
- 0d6641a parser: Skip inapplicable expression parsing paths (#28294) (Boshen)
- 3be7997 parser: Reduce lexer search batch size (#28292) (Boshen)
- ab5655a regex: Remove redundant character-class and quantifier checks (#28288) (Boshen)
- ec8e8d4 parser: Remove redundant grammar and lexer checks (#28287) (Boshen)
- c903f5c parser: Specialize known-token parsing (#28286) (Boshen)
- 2683225 str: `static_ident!` and `static_str!` macros guarantee const evaluation (#28340) (overlookmotel)
- df90836 ast: Reduce compile time of `#[ast]` macro (#28336) (overlookmotel)
- 8239dac parser: Replace dragonbox_ecma with zmij_ecma (#28282) (Boshen)

2026-11-02 19:40:44 +00:00

src

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tests

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Cargo.toml

release(crates): oxc v0.157.0 (#28719 )

2026-11-02 19:40:44 +00:00

CHANGELOG.md

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README.md

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README.md

Oxc Allocator

A high-performance memory allocator using bump-based arena allocation for fast AST node creation.

Overview

Oxc uses a bump-based memory arena for faster AST allocations. This crate provides an [Allocator] that manages memory efficiently by allocating objects in a single contiguous memory region, avoiding the overhead of individual heap allocations.

Key Features

Bump allocation: Fast allocation by simply incrementing a pointer
Arena-based memory management: All allocations live for the same lifetime
Zero-copy data structures: Efficient Box, Vec, String, and HashMap implementations
Optimal for AST operations: Perfect for parse-transform-emit workflows

Architecture

The allocator is designed specifically for AST processing workflows where:

A large number of nodes are allocated during parsing
All nodes have the same lifetime (tied to the AST)
Memory is released all at once when the AST is dropped

This approach is significantly faster than using the system allocator for AST operations.

Features

serialize - Enables serialization support for Box and Vec with serde and oxc_estree.
pool - Enables AllocatorPool.
bitset - Enables BitSet.
from_raw_parts - Adds unsafe from_raw_parts method (not recommended for general use).
fixed_size - Makes AllocatorPool create large fixed-size allocators, instead of flexibly-sized ones. Only supported on 64-bit little-endian platforms at present. Usage of this feature is not advisable, and it will be removed as soon as we're able to.
track_allocations - Count allocations and reallocations. For internal use only. The APIs provided by this feature are sketchy at best, and possibly undefined behavior. Do not enable this feature under any circumstances in production code.
disable_track_allocations - Disables track_allocations feature. Purpose is to prevent --all-features enabling allocation tracking.