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@odvcencio odvcencio released this 20 Jul 08:26
v0.43.1
c9bce5d
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TypeScript/TSX default-parameter parse fix, plus grammar-decode memory improvements and new CI diagnostics.

Fixed

  • TypeScript/TSX bare default parameters (function f(a = 1) {}) no longer collapse to ERROR. The fix widens the GLR merge budget when a default-parameter shape is present, covering plain, array-element ([a = 1]), renamed-property ({a: b = 1}), unicode-identifier, and comment-adjacent forms, in both TypeScript and TSX (PR #389). Root cause: the cap-one merge budget discarded the correct derivation by score before any structural comparison.
  • Destructuring declarations with defaults (const [a = 1] = arr) now parse correctly — incidental coverage from the same fix.

Improved

  • Grammar blob decoding pre-sizes its buffer from the gzip size hint. This cuts total allocation churn about 32% and peak memory about 11% across all 206 grammars.

Added

  • CI memory-ceiling test sweeps all 206 grammars and fails any Language() load above 256 MB. Swift is a documented exception.
  • Environment-gated diagnostic tests that characterize the incremental insert-retry timing nondeterminism from issue #380 (PR #388).

Known Issues

  • Swift's Language() call still retains about 491 MB. The root cause is upstream in grammargen (the lexer DFA rebuilds once per lex mode). A full fix is tracked.

Full changelog: https://github.com/odvcencio/gotreesitter/blob/main/CHANGELOG.md

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