fix type error on undefined union

src/language/rule/abstractRule.ts

@@ -20,6 +20,8 @@ import * as ts from "typescript";
 import { IWalker, WalkContext } from "../walker";
 import { IOptions, IRule, IRuleMetadata, RuleFailure, RuleSeverity } from "./rule";
 
+export type NoInfer<T> = T & {[K in keyof T]: T[K]};
+
 export abstract class AbstractRule implements IRule {
     public static metadata: IRuleMetadata;
     protected readonly ruleArguments: any[];
@@ -48,7 +50,7 @@ export abstract class AbstractRule implements IRule {
     }
 
     protected applyWithFunction(sourceFile: ts.SourceFile, walkFn: (ctx: WalkContext<void>) => void): RuleFailure[];
-    protected applyWithFunction<T>(sourceFile: ts.SourceFile, walkFn: (ctx: WalkContext<T>) => void, options: {} & T): RuleFailure[];
+    protected applyWithFunction<T>(sourceFile: ts.SourceFile, walkFn: (ctx: WalkContext<T>) => void, options: NoInfer<T>): RuleFailure[];
     protected applyWithFunction<T>(sourceFile: ts.SourceFile, walkFn: (ctx: WalkContext<T | void>) => void, options?: T): RuleFailure[] {
         const ctx = new WalkContext(sourceFile, this.ruleName, options);
         walkFn(ctx);