TypeScript documentation.

doc.ts

import * as ts from "typescript";

const options: ts.CompilerOptions = {
  moduleResolution: ts.ModuleResolutionKind.NodeJs,
  module: ts.ModuleKind.CommonJS,
  target: ts.ScriptTarget.ES2015,
  declaration: true
};

const host = ts.createCompilerHost(options);

const program = ts.createProgram(["index.ts"], options, host);

ts.getPreEmitDiagnostics(program);

const checker = program.getTypeChecker();

const entryFile = program.getSourceFile("index.ts");

const entrySymbol = checker.getSymbolAtLocation(entryFile);

const entryExports = checker.getExportsOfModule(entrySymbol);

entryExports.forEach(symbol => {
  if (symbol.getFlags() & ts.SymbolFlags.Alias) {
    symbol = checker.getAliasedSymbol(symbol);
  }
  let type = checker.getDeclaredTypeOfSymbol(symbol);
  console.log(symbol.getDocumentationComment());
  console.log(checker.typeToString(type));
});