ts-morph ts-simple-ast

parse.ts

// https://ts-ast-viewer.com/#code/GYVwdgxgLglg9mABACwKYBt1wBRgIYC2qAXIgM5QBOMYA5gDSJ5hxRqWIC8iA5GpnB4BKUhWp1EAbwBQiRJVRQQlJAAN+WRABJJ+IgF9VAbmn6gA
import { Project, SyntaxKind } from "ts-morph";

const project = new Project({});

project.addExistingSourceFiles("./src/thing.ts");

const node = project.getSourceFileOrThrow("./src/thing.ts");

const result = node.forEachDescendant((node, traversal) => {
  switch (node.getKind()) {
    case SyntaxKind.ImportDeclaration:
      const ob = {} as any;
      node.forEachChild(node => {
        ob[SyntaxKind[node.getKind()]] = node.getText();
        // console.log(node.getText());
        // console.log(SyntaxKind[node.getKind()]);
      });

      console.log({
        import: ob.ImportClause,
        from: ob.StringLiteral
      });

      break;
    case SyntaxKind.FunctionDeclaration:
      const fnName = node.getFirstChildByKindOrThrow(SyntaxKind.Identifier);
      console.log({ fnName: fnName.getText() });

      node
        .getChildrenOfKind(SyntaxKind.Parameter)
        .forEach(v =>
          v
            .getChildrenOfKind(SyntaxKind.Identifier)
            .forEach(v => console.log(v.getText()))
        );

      break;
    // case SyntaxKind.ClassDeclaration:
    //   // skips traversal of the current node's descendants
    //   traversal.skip();
    //   break;
    // case SyntaxKind.Parameter:
    //   // skips traversal of the current node's descendants and its siblings and all their descendants
    //   traversal.up();
    //   break;
    // case SyntaxKind.FunctionDeclaration:
    //   // stops traversal completely
    //   traversal.stop();
    //   break;
    // case SyntaxKind.InterfaceDeclaration:
    //   // stops traversal completely and returns this value
    //   return node;
  }

  return undefined;
});

console.log({ result });

thing.ts

function hello(name: string, another): string {
  return `hello ${name}`;
}