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Changelog

All notable changes to echojs are recorded here, newest first. The format follows Keep a Changelog; versions follow semver with the pre-1.0 reading: while the major is 0, a minor bump may break things and a patch bump may not.

Releases are cut by packaging/prepare-release.sh <version>, which rolls the Unreleased section into a dated version section, stamps the version everywhere it lives, and tags v<version>; pushing the tag runs the release pipeline (a release is a green bootstrap matrix + packaged artifacts + a clean-machine install smoke — see .github/workflows/release.yml).

[Unreleased]

[0.3.0] - 2026-08-05

Changed

  • Programs compile under the ECMAScript Module goal by default: every toplevel is strict mode and toplevel this is undefined. The new --script flag restores script-goal semantics (sloppy toplevel unless "use strict", this bound to globalThis). Parsing uses the module grammar either way.
  • test262 conformance sweep: the CI lane climbs from 43% to 75%+ passing. Builtin functions carry spec .name/.length and property attributes; builtin methods are no longer constructors; failed strict-mode assignments/deletes and constructing non-constructors throw proper TypeErrors; unresolvable references throw ReferenceError; destructuring follows the iterator protocol (close-on-completion, error propagation); anonymous classes get NamedEvaluation names; process.env is mutable (node parity).

Added

  • New globals and methods: full Date API (previously only getTime/getTimezoneOffset/toString), BigInt64Array/ BigUint64Array, SharedArrayBuffer and single-agent Atomics, Iterator and the iterator-helpers methods, DisposableStack/ AsyncDisposableStack/SuppressedError (+ Symbol.dispose/ Symbol.asyncDispose), WeakRef, FinalizationRegistry, AggregateError, Error.isError, error cause, Map/WeakMap.prototype.getOrInsert(Computed), Map.groupBy, WeakMap symbol keys, Array.prototype.toReversed/toSorted/ toSpliced/with/findLastIndex, the Set methods proposal (union et al), most missing %TypedArray%.prototype methods and typed-array construction from iterables/array-likes, String.prototype.isWellFormed/toWellFormed, Math.f16round/sumPrecise and the missing Math constants, JSON.rawJSON/isRawJSON, and spec SyntaxErrors from JSON.parse.
  • --types works in the self-hosted compiler: the MAAM abstract interpreter (external-deps/echojs-maam) is compiled into the bootstrap, so the shipped binary runs the same type analysis the node-hosted compiler does, with byte-identical output.
  • Module system: export * from and export * as ns from, and .js-suffixed relative import specifiers (NodeNext output style).
  • Standard library: Object.entries/values/fromEntries/hasOwn, Array.prototype.includes/at/flat/flatMap/findLast, and String.prototype.at/padStart/padEnd/trimStart/trimEnd/ replaceAll.

Fixed

  • Strings containing an embedded U+0000 are handled correctly end-to-end: source files no longer truncate at a raw NUL byte, distinct string literals differing only past a NUL no longer fuse into one constant, and ===/Object.is/relational comparisons/Map/Set see the full code-unit sequence.
  • Namespace objects (import * as ns / export * as ns) carry the correct object tag; runtime property reads on module namespace objects resolve through the export accessors.
  • String.prototype.replace no longer drops the tail of the string when the match ends at the second-to-last character, and $` (before-match) substitutions are supported.
  • Array.prototype.every applies ToBoolean to the callback result: falsy non-boolean results (null, 0, "") now fail the predicate.

[0.2.0] - 2026-07-30

Added

  • The EIR compilation pipeline: an SSA IR between the AST and LLVM, with a clang-style pass configuration (-O0..-O3 suites, -f/-fno- per-pass flags, --print-passes).
  • Type-feedback optimization: shape tracking, guarded fast paths, born-with-shape allocation, typed slots, allocation sinking, devirtualization, and an export-boundary specialization wrapper.
  • A generational, mostly-copying garbage collector with compaction, precise young-generation roots from compiler-emitted gc-frames, and EJS_GC_* debugging knobs.
  • Relocatable per-platform dist tarballs (macOS arm64, Linux arm64/x86_64) with a bundled prefix installer, a Homebrew formula generator, and an npm wrapper package (@pirouette/echojs).
  • An LLVM toolchain policy: the driver discovers a matching-major opt/llc (env LLVM_BINDIR override → build-baked path → conventional locations → PATH) and refuses to run against a different major.
  • A value-based test harness whose baselines are independent of the node version, and a fully self-hosted bootstrap proven by a four-stage CI matrix on all three platforms.

Changed

  • The compiler sources are TypeScript throughout; babel is gone from the toolchain (one tsc pass converts modules for the build).

Fixed

  • Too many runtime-correctness fixes to enumerate here (typeof null, -0 semantics, Math.round ties, string-to-number edge cases, sparse arrays, generator exception propagation, error prototype chains, DataView indexing, and more) — see docs/runtime-p1-results.md and docs/runtime-p3-results.md.