diff --git a/src/plugin/getLuminance/index.ts b/src/plugin/getLuminance/index.ts
index cae9f82..5a9f9e8 100644
--- a/src/plugin/getLuminance/index.ts
+++ b/src/plugin/getLuminance/index.ts
@@ -12,8 +12,8 @@ const f = (x: number) => {
   const channel = x / 255;
   return channel <= 0.040_45
     ? channel / 12.92
-    : Math.pow(((channel + 0.055) / 1.055), 2.4);
-}
+    : Math.pow((channel + 0.055) / 1.055, 2.4);
+};
 
 /**
  * Returns a number (float) representing the luminance of a color.
@@ -21,12 +21,12 @@ const f = (x: number) => {
 export const getLuminance: MyColorPlugin<OhColorFactory> = (_, c, cf) => {
   const proto = c.prototype as OhColorClass;
   const getRGB = proto.rgba;
-  proto.getLuminance = function() {
+  proto.getLuminance = function () {
     const [r, g, b] = getRGB.bind(this)();
     return 0.2126 * f(r) + 0.7152 * f(g) + 0.0722 * f(b);
-  }
+  };
 
   return cf as OhColorFactory;
-}
+};
 
-export default getLuminance
+export default getLuminance;
diff --git a/src/plugin/index.ts b/src/plugin/index.ts
index 31ed03a..faab6c8 100644
--- a/src/plugin/index.ts
+++ b/src/plugin/index.ts
@@ -1,4 +1,4 @@
 export { inputHex } from "./inputHex";
 export { outputHex } from "./outputHex";
-export { inputNamed } from './inputNamed';
-export { getLuminance } from './getLuminance';
+export { inputNamed } from "./inputNamed";
+export { getLuminance } from "./getLuminance";
diff --git a/test/index.test.ts b/test/index.test.ts
index e6e22c1..cd5f7bd 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -27,7 +27,7 @@ describe("mycolor", () => {
     const { inputHex, getLuminance } = await import("../src/plugin");
     const mycolor2 = mycolor.extend(inputHex).extend(getLuminance);
     expect(mycolor2("red").getLuminance()).toBe(0.2126);
-  })
+  });
 });
 
 describe("mycolor built-in plugins", () => {
diff --git a/test/plugin/get-luminance.test.ts b/test/plugin/get-luminance.test.ts
index 71c3470..fb9e7b4 100644
--- a/test/plugin/get-luminance.test.ts
+++ b/test/plugin/get-luminance.test.ts
@@ -1,6 +1,6 @@
 import { expect, it, describe } from "vitest";
 import { mycolor } from "../../src";
-import { getLuminance } from "../../src/plugin"
+import { getLuminance } from "../../src/plugin";
 
 describe("mycolor plugin: getLuminance", () => {
   it("should get luminance", () => {
@@ -8,4 +8,4 @@ describe("mycolor plugin: getLuminance", () => {
 
     expect(mycolor2(255, 255, 0, 1).getLuminance()).toBe(0.9278);
   });
-})
+});