Is there a way to halt the current traversal of visitEachChild in TypeScript Transformer API?

While navigating through each child node of a parent node using visitEachChild, is there a way to stop the process when I no longer wish to visit the subsequent child nodes? For example:

  • Parent node
    • Node 1
    • Node 2 <-- My target point.
    • Node 3
    • Node 4
    • Node 5

How can we halt the traversal at a specific point? Meaning, I do not want to proceed with iterating over Node 3, 4, 5, etc., similar to using a "break" statement.

For instance:

class A {
    public template() { // <-- My intended stop here.
        return 'Template';
    }

    someThing() {}

    foo() {}
}

Transformer:

const transformerFactory: ts.TransformerFactory<ts.Node> =
    (context: ts.TransformationContext) => (rootNode) => {
        const visit = (node: ts.Node): ts.Node => {            
            if (ts.isClassDeclaration(node)) {
                ts.visitEachChild(node, (child) => {
                    if (ts.isMethodDeclaration(child)) {
                        console.log(child.name.getText());
                        
                        if (child.name.getText() === 'template') {
                            
                            return "I don't want to move to the sibling node. Break right here!!!";
                        } else return child;
                    } else return child;
                }, context);
                return node;
            }
            return ts.visitEachChild(node, visit, context);
        };

        return ts.visitNode(rootNode, visit);
    };

Answer №1

If you're faced with this scenario, consider examining the members property array within the class declaration directly. Otherwise, utilize ts.forEachChild to stop iterating through the children by returning a value (keep in mind that the returned value in the function provided will also be the value returned by ts.forEachChild).

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