# thlorenz/deoptigate

⏱️ Investigates v8/Node.js function deoptimizations.

Repository: https://github.com/thlorenz/deoptigate
Canonical: https://ross.abutalabs.com/products/deoptigate
Homepage: https://nodesource.github.io/deoptigate-examples/xml2js/01_start/?selectedFileIdx=31&selectedLocation=157&includeAllSeverities=false&highlightCode=true&selectedTabIdx=1&selectedSummaryTabIdx=1
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2022-12-12T03:53:04+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3060, "days_push": 1360, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1169, forks 20 (observed 2026-08-28T04:03:51.056713+00:00)

## What it is
Deoptigate is a CLI tool that investigates V8/Node.js function deoptimizations by processing v8 logs and presenting them in a visual viewer. It helps developers track down and fix performance bottlenecks caused by deoptimized functions.

## Use cases
- investigate why my node.js function got deoptimized
- analyze v8 log for deoptimizations
- find performance bottlenecks in node app
- visualize v8 optimization and deoptimization events
- debug slow javascript functions in node

## When to choose
- you're profiling node.js apps and need to see deoptimizations inline with source code
- you have existing *-v8.log files you want to analyze visually

## When to avoid
- you need general CPU profiling rather than deoptimization analysis
- you're targeting browsers or non-V8 runtimes

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: developer-tools, monitoring, benchmarking
- domain: developer-tools, performance
- platform: cli, cross-platform
- tags: v8, nodejs, profiling, deoptimization, performance-analysis, javascript

## Member repositories
- thlorenz/deoptigate (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:51.056713+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:28:44.264879+00:00, confidence not recorded.
  - readme: https://github.com/thlorenz/deoptigate (fetched 2026-08-28T04:03:51.056713+00:00, sha 83fdd0f28dda)
  - registry_npm: https://registry.npmjs.org/deoptigate (fetched 2026-08-29T12:34:43.549174+00:00, sha 4bbf436ffb51)
- Data as of 2026-08-30T08:39:29.467469+00:00.