rescript-lezer

This is a ReScript grammar for the lezer parser system.

The top option can be set to "SingleExpression" to parse an expression instead of a full program.

Grammar Audit

Use the audit script to find remaining grammar bugs against the official ReScript parser.

Quick run

npm run build
npm run audit:grammar

Strict mode (CI-friendly)

npm run audit:grammar:strict

Custom run

node scripts/audit-grammar.mjs \
  --mode all \
  --rescript-root ../rescript \
  --max-files 800 \
  --fuzz-cases 500 \
  --incremental-cases 300 \
  --include-idempotency \
  --report /tmp/rescript-lezer-audit.json

What it checks

• Differential parse agreement vs ReScript (-only-parse) on upstream corpus files
• Mutation fuzzing with mismatch detection
• Incremental parse consistency (incremental tree vs fresh parse)

The code is licensed under an MIT license.