1.1.0 - 2026-01-28

Release Notes

Added

• Go language support for mutation testing
• JavaScript and TypeScript language support (including JSX files)
• mewt status command for campaign overview with per-file breakdown and aggregates
  • --format option: "table" (default) or "json"
• mewt results command (promoted from print results subcommand)
  • Enhanced filtering with --status, --language, --mutation_type, --line, --file options
  • SARIF output format support (--format sarif)
  • JSON and "ids" output formats
• mewt test --ids-file option to read mutant IDs from file or stdin (use - for stdin)
• JSON output format support for multiple commands:
  • mewt print mutations --format json
  • mewt print targets --format json
  • mewt print mutants --format json
• Enhanced filtering for print results, print mutants, and results commands:
  • --status: Filter by outcome status (Uncaught, TestFail, Skipped, Timeout)
  • --language: Filter by programming language
  • --mutation_type: Filter by mutation slug (e.g., ER, CR, BR)
  • --line: Filter by line number
  • --file: Filter by file path (substring match)
• mewt print mutants filtering options:
  • --tested: Show only mutants with test outcomes
  • --untested: Show only mutants without test outcomes
  • --format ids: Output just mutant IDs, one per line

Changed

• mewt test --ids is now optional when using --ids-file
• Cleaner log output (removed info level prefix)

Removed

• BuildFail outcome status (simplified outcome types)

Install mewt 1.1.0

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/trailofbits/mewt/releases/download/v1.1.0/mewt-installer.sh | sh

Download mewt 1.1.0

File	Platform	Checksum
mewt-aarch64-apple-darwin.tar.xz	Apple Silicon macOS	checksum
mewt-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
mewt-x86_64-unknown-linux-gnu.tar.xz	x64 Linux	checksum