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Changelog

0.12.0

Changed

  • Upgraded OXC toolchain from 0.117 to 0.129 — 12 releases of parser, transformer, minifier, and codegen improvements.
  • Upgraded OXC formatter from crates_v0.117.0 to crates_v0.129.0.
  • Upgraded OXC linter from crates_v0.117.0 to crates_v0.129.0 (oxc_linter 1.62.0).
  • Upgraded oxc_sourcemap from 6 to 6.1.

0.11.0

Added

  • OXC.bundle/2 accepts filesystem entry paths, e.g. OXC.bundle("src/main.ts", cwd: project_dir), alongside virtual {filename, source} projects.
  • Bundle resolver options for Rolldown: :conditions, :main_fields, and :modules.
  • Bundle output options for Rolldown: :exports and :preserve_entry_signatures.

Changed

  • Removed the binding-level bare import auto-externalization pass; Rolldown now handles unresolved externals directly.

0.10.0

Added

  • OXC.codegen/1 / codegen!/1 — generate JavaScript source from ESTree AST maps via OXC's code generator. Proper operator precedence, formatting, and semicolons. Roundtrips with parse/2.
  • OXC.bind/2 — substitute $placeholders in a parsed AST with identifiers, literals (including recursive maps/lists → JS objects/arrays), parsed expressions, or raw AST nodes.
  • OXC.splice/3 — expand a $placeholder statement, object property, or array element into a list of nodes. Strings are auto-parsed as JS.
  • :external option for OXC.bundle/2 — list of bare specifiers to preserve as import statements in the output. Merged with auto-detected ESM externals.

0.9.1

Fixed

  • Enable JSX parsing for .js files in formatter, matching oxfmt CLI behavior. Fixes formatting failures on projects using JSX in .js files (e.g. Plausible Analytics).

0.9.0

Added

  • OXC.Format — Prettier-compatible JS/TS formatter via oxfmt (~30× faster than Prettier). Separate oxc_fmt_nif Rust NIF crate. All oxfmt options supported: print_width, tab_width, use_tabs, semi, single_quote, jsx_single_quote, trailing_comma, bracket_spacing, bracket_same_line, arrow_parens, end_of_line, quote_props, single_attribute_per_line, object_wrap, experimental_operator_position, experimental_ternaries, embedded_language_formatting, sort_imports, sort_tailwindcss.
  • OXC.Lint.run!/3 — bang variant that raises OXC.Error on parse errors.

Changed

  • OXC.Format.run!/3 raises OXC.Error instead of RuntimeError.

0.8.0

Added

  • OXC.Lint.run/3 — lint JS/TS source with oxlint's 650+ built-in rules via a Rust NIF. Supports all oxlint plugins (react, typescript, unicorn, import, jsdoc, jest, vitest, jsx-a11y, nextjs, promise, node, vue) and configurable rule severities.
  • OXC.Lint.Rule behaviour — write custom lint rules in Elixir that operate on the parsed ESTree AST. Rules use OXC.walk/2, OXC.collect/2, or OXC.postwalk/3 for traversal and return diagnostics with spans.
  • Built-in and custom rules run together in a single OXC.Lint.run/3 call.

0.7.2

Added

  • OXC.transform_many/2 — transform multiple files in parallel via a Rust rayon thread pool. Single NIF call, no BEAM scheduling overhead. 6.8x faster than sequential transform/3 on 2000 files.

0.7.1

Fixed

  • Fix parse/2 hitting serde_json recursion limit on deeply nested ASTs (e.g. large bundled output from Vue + reka-ui). Uses streaming deserializer with unbounded depth.

0.7.0

Breaking changes

  • AST :type and :kind values are now snake_case atoms instead of strings. "ImportDeclaration" → :import_declaration, "const" → :const, etc. Migration: update all pattern matches from %{type: "ImportDeclaration"} to %{type: :import_declaration}.
  • All error tuples now return {:error, [%{message: String.t()}]} consistently. Previously transform, minify, imports, and bundle returned {:error, [String.t()]}.
  • Bang functions (parse!, transform!, minify!, bundle!, etc.) now raise OXC.Error instead of RuntimeError. The exception has an :errors field with the structured error list.

Added

  • OXC.collect_imports/2 — analyze imports with type info (:static/:dynamic), kind (:import/:export/:export_all), and byte offsets. Powered by a Rust NIF using OXC's visitor pattern.
  • OXC.rewrite_specifiers/3 — rewrite import/export specifiers in a single pass without Elixir-side AST walking.
  • :preamble option for bundle/2 — inject code at the top of the IIFE function body.
  • :treeshake option for bundle/2 — enable tree-shaking (default: false).
  • walk/2, postwalk/2, postwalk/3 now accept a list of nodes at the root level.
  • OXC.Error exception module.

Changed

  • collect/2 uses a recursive accumulator instead of creating an ETS table per call.
  • to_snake_atom uses Macro.underscore/1 instead of hand-rolled regex.
  • ImportInfo uses #[derive(NifMap)] instead of a manual Encoder impl.
  • @type ast tightened to %{required(:type) => atom(), optional(atom()) => any()}.
  • patch_string/2 deduplication behavior is now documented.
  • Rust NIF split from a single 800-line lib.rs into parse.rs, imports.rs, bundle.rs, options.rs, error.rs.
  • Import collector rewritten with oxc_ast_visit::Visit trait (~50 lines) replacing a hand-rolled 250-line AST walker.
  • Bundle chunk selection no longer falls through to arbitrary chunks.

0.6.2

  • Fix absolute temp dir paths leaking into #region comments in bundled output

0.6.1

  • Added :format option to bundle/2 — supports :iife (default), :esm, and :cjs output formats

0.6.0

Breaking changes

  • OXC.bundle/2 now requires entry: "..." to identify the bundle entry module. Migration: change OXC.bundle(files) to OXC.bundle(files, entry: "main.ts").

Changed

  • OXC.bundle/2 now uses Rolldown/OXC for bundling.
  • Internal Rustler boundary code for parse, transform, minify, and bundle was simplified with serde-based term encoding/decoding.

0.5.4

  • Handle export default <expression> in bundler — emits var _default = <expr> instead of dropping the expression. Fixes Vue SFC compiled output losing the component object.

0.5.3

  • Fix export { local as default } producing var default = local (syntax error). The bundler's alias emitter now uses _default for the reserved word default.

0.5.2

  • (yanked — fix was incomplete)

0.5.1

  • Handle circular dependencies in bundler's topological sort — modules in a cycle are appended in sorted order instead of raising an error. Enables bundling Vue, Reka UI, and other frameworks with circular imports.

0.5.0

  • Initial precompiled NIF release (aarch64-apple-darwin, x86_64-apple-darwin, x86_64-unknown-linux-gnu, aarch64-unknown-linux-gnu, x86_64-unknown-linux-musl)
  • Move to elixir-volt org

0.4.0

  • OXC.bundle/2 — bundle multiple JS/TS modules into a single IIFE with topological sorting and import resolution
  • OXC.imports/2 — extract import specifiers from source
  • OXC.postwalk/3 — AST traversal with accumulator for source patching
  • OXC.patch_string/2 — apply byte-offset patches
  • Compile-time replacements via :define option
  • Source map support in bundle and minify