From 7522d84f44f6a759bf696605c6e120c8fd9c105d Mon Sep 17 00:00:00 2001
From: Rubilmax <rmilon@gmail.com>
Date: Sun, 29 Jan 2023 20:08:10 +0100
Subject: [PATCH] fix(power): add percent-based power

---
 src/index.ts       | 4 ++++
 test/index.spec.ts | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/src/index.ts b/src/index.ts
index d64d923..6f00c7c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -47,6 +47,7 @@ declare module "@ethersproject/bignumber/lib/bignumber" {
     percentDivUp: (other: BigNumberish) => BigNumber;
     percentDivDown: (other: BigNumberish) => BigNumber;
     percentAvg: (other: BigNumberish, pct: BigNumberish) => BigNumber;
+    percentPow: (exponent: BigNumberish) => BigNumber;
     percentToWad: () => BigNumber;
     percentToRay: () => BigNumber;
     formatPercent: (digits?: number) => string;
@@ -158,6 +159,9 @@ BigNumber.prototype.percentDivDown = function (other: BigNumberish) {
 BigNumber.prototype.percentAvg = function (other: BigNumberish, pct: BigNumberish) {
   return avgUp(this, other, pct, PERCENT);
 };
+BigNumber.prototype.percentPow = function (exponent: BigNumberish) {
+  return pow(this, exponent, PERCENT);
+};
 BigNumber.prototype.percentToWad = function () {
   return this.mul(WAD_PERCENT_RATIO);
 };
diff --git a/test/index.spec.ts b/test/index.spec.ts
index db6b0f4..8b987ad 100644
--- a/test/index.spec.ts
+++ b/test/index.spec.ts
@@ -103,6 +103,8 @@ describe("ethers-maths", () => {
   });
 
   it("should raise to the power of n", async () => {
+    expect(BigNumber.PERCENT.add(BigNumber.PERCENT).percentPow(2).formatPercent(1)).toEqual("4.0");
+    expect(BigNumber.PERCENT.add(BigNumber.PERCENT).percentPow(3).formatPercent(1)).toEqual("8.0");
     expect(BigNumber.WAD.add(BigNumber.WAD).wadPow(2).formatWad(1)).toEqual("4.0");
     expect(BigNumber.WAD.add(BigNumber.WAD).wadPow(3).formatWad(1)).toEqual("8.0");
     expect(BigNumber.RAY.add(BigNumber.RAY).rayPow(2).formatRay(1)).toEqual("4.0");