Example of the Rule API from TSLint, using a Walker

rule-with-walker.ts

// Dependencies:
import { RuleFailure, Rules } from 'tslint';
import { SourceFile } from 'typescript';

export class Rule extends Rules.AbstractRule {
    public apply (sourceFile: SourceFile): Array<RuleFailure> {
        return this.applyWithWalker(new MyCustomRuleWalker(sourceFile));
    }
}