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Tech riderRev. 20 Sept 2026

@kongyo2/similarity-ts

Ch 196.5of 23 Code Clone Detection Tools
  1. 1Runs onNot stated by the maker
  2. 2CostsNot stated by the maker
  3. 3Clone detection methodast
  4. 4Scan scoperepository
  5. 5CI integrationYes
  6. 6IDE integrationNo
  7. 7Self-hosted optionYes
5 lines stated Written from the maker's own pages: github.com
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Overview

@kongyo2/similarity-ts is ranked #19 of 23 in code clone detection tools on Specifiction.

Compared on code clone detection tools

Free plan
Yesgithub.com
Clone detection method
astgithub.com
Scan scope
repositorygithub.com
CI integration
Yesgithub.com
IDE integration
Nogithub.com
Self-hosted option
Yesgithub.com

Facts

Purpose
The project describes itself as a TypeScript-only similarity analyzer that compares functions, types, and classes structurally.github.com · 5 Oct 2026
Install and run
The README’s quick start runs the analyzer with `npx @kongyo2/similarity-ts .`.github.com · 5 Oct 2026
Supported file extensions
The default extensions it scans are `ts`, `tsx`, `mts`, and `cts`.github.com · 5 Oct 2026
Code style matching
It canonicalizes documented style variants, including arrow functions versus declarations, `.then()` versus `await`, and several loop forms.github.com · 5 Oct 2026
Analysis modes
Its default modes are functions, types, classes, and overlap, and the README documents options to select modes and restrict scan scope.github.com · 5 Oct 2026
Threshold and size controls
The similarity threshold defaults to 0.8, the minimum function length defaults to three lines, and a minimum AST-token size can replace the line gate.github.com · 5 Oct 2026
Output and CI
It supports pretty or JSON output and a `--fail-on-duplicates` option that exits nonzero when any pair is reported.github.com · 5 Oct 2026
Exclusions
A declaration can be excluded from the report with a `// similarity-ignore` comment on the preceding line.github.com · 5 Oct 2026
Behavioral distinctions
The README says behavior-changing differences such as `.map` versus `.filter`, `async` versus sync, and `??` versus `||` retain distinct comparison shapes.github.com · 5 Oct 2026
Accuracy benchmark
The README reports that version 0.7.0 labeled all 300 pairs in its documented ground-truth benchmark correctly at the default threshold.github.com · 5 Oct 2026
License
The repository identifies its license as MIT.github.com · 5 Oct 2026
Package form and runtime
The package metadata describes a CLI and library, exposes a command-line binary and JavaScript entry point, and specifies Node.js 20 or newer.github.com · 5 Oct 2026
Maker identity
The repository is hosted under the GitHub account `kongyo2`; the opened project pages do not state a maker’s personal or company name, headquarters, or founding date.github.com · 5 Oct 2026
Usage
The README shows running it on the current directory with `npx @kongyo2/similarity-ts .`.github.com · 7 Oct 2026
Analysis targets
It compares functions, types, and classes structurally.github.com · 7 Oct 2026
Rename handling
It alpha-renames function parameters, locals, inner functions, and declaration names before comparison, while retaining free identifier names.github.com · 7 Oct 2026
Style normalization
The analyzer canonicalizes several equivalent coding forms, including function declarations and arrow functions, some loop rewrites, and structurally identical interfaces and type aliases.github.com · 7 Oct 2026
CLI controls
The CLI supports selecting analysis modes, setting a similarity threshold, filtering file extensions, excluding patterns, and choosing pretty or JSON output.github.com · 7 Oct 2026
CI use
The CLI offers a `--fail-on-duplicates` option that exits non-zero when any pair is reported.github.com · 7 Oct 2026
Runtime requirement
The package metadata specifies Node.js version 20 or newer.github.com · 7 Oct 2026
Package formats
The package metadata exposes both a `similarity-ts` command-line executable and a JavaScript library entry point with TypeScript declarations.github.com · 7 Oct 2026
Intended workflow
The README suggests using the command with an AI coding assistant to find duplicate code patterns and create a refactoring plan.github.com · 7 Oct 2026

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