morphic-analyzer

A Node.js library to inspect Inline Cache (IC) state transitions in your JavaScript code using V8 logs.

It detects functions that become POLYMORPHIC or MEGAMORPHIC, helping you identify potential performance pitfalls in your code.

📦 Installation

npm install morphic-analyzer

🧪 Usage

const { morphicAnalyzer } = require('morphic-analyzer');

morphicAnalyzer('./your-script.js').then((results) => {
  console.log(JSON.stringify(results, null, 2));
});

📋 Example Output

[
  {
    "functionName": "updateUser",
    "file": "src/user.js",
    "location": "42",
    "icTransitions": [
      {
        "icType": "LoadIC",
        "property": "name",
        "line": 43,
        "column": 14,
        "fromState": "MONOMORPHIC",
        "toState": "POLYMORPHIC",
        "transitionLineIndex": 123
      }
    ]
  }
]