How to use the idyll-ast.modifyNodesByName function in idyll-ast

modifyChildren(ast[0], (n: Node) => {
    if (typeof n === "object") {
        n[0] = "somename";
    }
});
// $ExpectType Node[]
getNodesByName(ast, "h1");

// $ExpectType Node
filterChildren(ast[1], n => n === "world");

// $ExpectType Node[] || AST
filterNodes(ast, n => (n instanceof Object ? n[0] === "h1" : false));

// $ExpectType Node[] || AST
modifyNodesByName(ast, "h2", n => {
    typeof n === "object" ? (n[1] = []) : undefined;
});

// $ExpectType [PropType, PropData] | null || PropValue | null
getProperty(ast[1], "someProp");
// $ExpectType [string, [PropType, PropData]] || Property
getProperties(ast[1])[0];
// $ExpectType [string, [PropType, PropData]][] || Property[]
getPropertiesByType(["h1", [], []], "variable");

// $ExpectType Node[] || AST
removeNodesByName(ast, "h1");

// $ExpectType Node
setProperty(ast[0], "prop", 9);

modifyAST() {
    const currentAST = this.context.ast;
    const h2Nodes = AST.modifyNodesByName(currentAST, 'h2', node => {
      node.children[0].value = 'alan took over';
      return node;
    });
    this.context.setAst({ ...h2Nodes });
  }

const wrapText = (ast) => {
  return modifyNodesByName(ast, 'TextContainer', (node) => {
    return modifyChildren(node, (child) => {
      if (typeof child === 'string') {
        return ['p', [], [child]];
      }
      return child;
    })
  })
};