How can I get type names and member TypeObjects from a ts.TypeObject?

Question

I'm working with a TypeScript compiler to perform some code generation. This is my first time working with the compiler API directly.

With some ugly narrowing below (improvement of which I will save for another question), I'm able to get a ts.TypeObject from a FirstStatement. However, I'm unsure how I can use this object to examine its type.

I need to be able to do two things with this type object (or other):

1. Extract the top-level type name.
2. Recursively extract members' type names down to primitives.

import ts from “typescript”;

// get program, checker, and sources
const program = ts.createProgram([__filename], {});
const checker = program.getTypeChecker();
const sources = program.getSourceFiles();

// iterate through sources
sources.forEach((source)=>{
    if(source.fileName === __filename){ // find this file
        ts.forEachChild(source, (node)=>{
            if(ts.SyntaxKind[node.kind] === "FirstStatement"){ // find first statements
                ts.forEachChild(node, (child)=>{
                    if(!(child as any).declarations) return;
                    const dec = (child as any).declarations[0]; // get the first declaration
                    if(dec && dec.symbol) console.log(checker.getTypeOfSymbolAtLocation(dec.symbol, node))
                }); // get the type of the symbol
            }
        })
    }
});

How can I do this? Or, in the least, where should I be looking in the docs for these kinds of questions?

Answer 1

I guess I was just feeling a bit too lazy when I wrote this. There is an example in the docs.