From fbaf28e4f8468eb5f2c59d3b60979d398c7ca086 Mon Sep 17 00:00:00 2001
From: Jacco van den Berg <jaccoberg2281@gmail.com>
Date: Tue, 27 Sep 2022 13:00:48 +0200
Subject: [PATCH] Use guard clause typings (#10683)

* Use guard clasue

* use function type instead of build in function
---
 src/helpers/helpers.core.ts      | 2 +-
 types/helpers/helpers.color.d.ts | 2 +-
 types/helpers/helpers.math.d.ts  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/helpers/helpers.core.ts b/src/helpers/helpers.core.ts
index 304394c47..964fc8eee 100644
--- a/src/helpers/helpers.core.ts
+++ b/src/helpers/helpers.core.ts
@@ -390,7 +390,7 @@ export function _capitalize(str: string) {
 
 export const defined = (value: unknown) => typeof value !== 'undefined';
 
-export const isFunction = (value: unknown) => typeof value === 'function';
+export const isFunction = (value: unknown): value is (...args: any[]) => any => typeof value === 'function';
 
 // Adapted from https://stackoverflow.com/questions/31128855/comparing-ecma6-sets-for-equality#31129384
 export const setsEqual = <T>(a: Set<T>, b: Set<T>) => {
diff --git a/types/helpers/helpers.color.d.ts b/types/helpers/helpers.color.d.ts
index 460b8d1fe..556f8f488 100644
--- a/types/helpers/helpers.color.d.ts
+++ b/types/helpers/helpers.color.d.ts
@@ -10,7 +10,7 @@ export function color(
   | [number, number, number, number]
 ): ColorModel;
 
-export function isPatternOrGradient(value: string | AnyObject): boolean;
+export function isPatternOrGradient(value: unknown): value is CanvasPattern | CanvasGradient;
 
 export interface ColorModel {
   rgbString(): string;
diff --git a/types/helpers/helpers.math.d.ts b/types/helpers/helpers.math.d.ts
index cc58b30e7..63439d481 100644
--- a/types/helpers/helpers.math.d.ts
+++ b/types/helpers/helpers.math.d.ts
@@ -1,5 +1,5 @@
 export function log10(x: number): number;
-export function isNumber(v: unknown): boolean;
+export function isNumber(v: unknown): v is Number;
 export function almostEquals(x: number, y: number, epsilon: number): boolean;
 export function almostWhole(x: number, epsilon: number): number;
 export function sign(x: number): number;