checker

checker-example.ts

ts.forEachChild(source, node => {
  if (ts.isTypeAliasDeclaration(node)) {
    const symbol = checker.getSymbolAtLocation(node.name);
    const type = checker.getDeclaredTypeOfSymbol(symbol);
    const properties = checker.getPropertiesOfType(type);
    properties.forEach(declaration => {
      console.log(declaration.name);
      // prints username, info
    });
  }
});