walker-api-example.ts

import { AbstractWalker } from 'tslint';
import { forEachChild, Node, SourceFile } from 'typescript';

class NoFDescribeOrFItWalker extends AbstractWalker {
    public walk (sourceFile: SourceFile) {
        const walkNode = (node: Node): void => {
            // ...
            // evaluate rule
            // ...
            return forEachChild(node, walkNode);
        };
        return forEachChild(sourceFile, walkNode);
    }
}