From 074f95e32e8fca0267a9036208f9d58b71b2429c Mon Sep 17 00:00:00 2001
From: Nicholas Jamieson <nicholas@cartant.com>
Date: Sat, 4 Nov 2017 12:49:07 +1000
Subject: [PATCH] refactor(interfaces): replace type aliases

See https://github.com/Microsoft/TypeScript/issues/19198
---
 src/interfaces.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/interfaces.ts b/src/interfaces.ts
index 5d825f231d..957bb7c6b0 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -1,9 +1,9 @@
 import { Observable } from './Observable';
 
-export type UnaryFunction<T, R> = (source: T) => R;
+export interface UnaryFunction<T, R> { (source: T): R; }
 
-export type OperatorFunction<T, R> = UnaryFunction<Observable<T>, Observable<R>>;
+export interface OperatorFunction<T, R> extends UnaryFunction<Observable<T>, Observable<R>> {}
 
 export type FactoryOrValue<T> = T | (() => T);
 
-export type MonoTypeOperatorFunction<T> = OperatorFunction<T, T>;
+export interface MonoTypeOperatorFunction<T> extends OperatorFunction<T, T> {}