(JS/TS) Resolve FQNs for Definitions

Suppose we've already captured definitions with ast-grep, we'll need to compute a fully qualified name (FQN) for each one.

If our input file is src/utils.js:

function topLevel() {
    return true;
}

class Calculator {
    add(a, b) {
        return a + b;
    }
    
    class MathUtils {
        static PI = 3.14;
        
        square(x) {
            return x * x;
        }
    }
}

const print = () => { console.log("Hello World") }

const config = {
    timeout: 5000,
    validate() {
        return this.timeout > 0;
    }
};

Here's what we'd expect for FQNs for our input file:

• src.utils.topLevel
• src.utils.Calculator
• src.utils.Calculator.add
• src.utils.Calculator.MathUtils
• src.utils.Calculator.MathUtils.PI
• src.utils.Calculator.MathUtils.square
• src.utils.print
• src.utils.config
• src.utils.config.validate

Keep in mind that if we have anonymous functions accessible via object like:

const authMiddleware = {
    jwt: {
        verify: async (token, options = {}) => {
           // Do Something
        }
    }
};

Our FQN would be src.utils.authMiddleware.jwt.verify, but if the underlying implementation of verify gets overwritten at runtime, or authMiddleware gets aliased, we'll need to account for it. Open to suggestions here.