diff --git a/lib/extract/extractColor.js b/lib/extract/extractColor.js
index 570dcf13..454ffe4f 100644
--- a/lib/extract/extractColor.js
+++ b/lib/extract/extractColor.js
@@ -265,143 +265,142 @@ function hwbFromString(string) {
   return null;
 }
 
-const convert = {
-  hsl: function hslToRgb(hsl) {
-    const h = hsl[0] / 360;
-    const s = hsl[1] / 100;
-    const l = hsl[2] / 100;
-    let t1;
-    let t2;
-    let t3;
-    let rgb;
-    let val;
+function hslToRgb(hsl) {
+  const h = hsl[0] / 360;
+  const s = hsl[1] / 100;
+  const l = hsl[2] / 100;
+  let t1;
+  let t2;
+  let t3;
+  let rgb;
+  let val;
 
-    if (s === 0) {
-      val = l * 255;
-      return [val, val, val];
+  if (s === 0) {
+    val = l * 255;
+    return [val, val, val];
+  }
+
+  if (l < 0.5) {
+    t2 = l * (1 + s);
+  } else {
+    t2 = l + s - l * s;
+  }
+
+  t1 = 2 * l - t2;
+
+  rgb = [0, 0, 0];
+  for (let i = 0; i < 3; i++) {
+    t3 = h + (1 / 3) * -(i - 1);
+    if (t3 < 0) {
+      t3++;
+    }
+    if (t3 > 1) {
+      t3--;
     }
 
-    if (l < 0.5) {
-      t2 = l * (1 + s);
+    if (6 * t3 < 1) {
+      val = t1 + (t2 - t1) * 6 * t3;
+    } else if (2 * t3 < 1) {
+      val = t2;
+    } else if (3 * t3 < 2) {
+      val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
     } else {
-      t2 = l + s - l * s;
+      val = t1;
     }
 
-    t1 = 2 * l - t2;
+    rgb[i] = val * 255;
+  }
 
-    rgb = [0, 0, 0];
-    for (let i = 0; i < 3; i++) {
-      t3 = h + (1 / 3) * -(i - 1);
-      if (t3 < 0) {
-        t3++;
-      }
-      if (t3 > 1) {
-        t3--;
-      }
+  return rgb;
+}
 
-      if (6 * t3 < 1) {
-        val = t1 + (t2 - t1) * 6 * t3;
-      } else if (2 * t3 < 1) {
-        val = t2;
-      } else if (3 * t3 < 2) {
-        val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
-      } else {
-        val = t1;
-      }
+function hwbToRgb(hwb) {
+  const h = hwb[0] / 360;
+  let wh = hwb[1] / 100;
+  let bl = hwb[2] / 100;
+  const ratio = wh + bl;
+  let i;
+  let v;
+  let f;
+  let n;
 
-      rgb[i] = val * 255;
-    }
+  // wh + bl cant be > 1
+  if (ratio > 1) {
+    wh /= ratio;
+    bl /= ratio;
+  }
 
-    return rgb;
-  },
-  hwb: function hwbToRgb(hwb) {
-    const h = hwb[0] / 360;
-    let wh = hwb[1] / 100;
-    let bl = hwb[2] / 100;
-    const ratio = wh + bl;
-    let i;
-    let v;
-    let f;
-    let n;
+  i = Math.floor(6 * h);
+  v = 1 - bl;
+  f = 6 * h - i;
 
-    // wh + bl cant be > 1
-    if (ratio > 1) {
-      wh /= ratio;
-      bl /= ratio;
-    }
+  if ((i & 0x01) !== 0) {
+    f = 1 - f;
+  }
 
-    i = Math.floor(6 * h);
-    v = 1 - bl;
-    f = 6 * h - i;
+  n = wh + f * (v - wh); // linear interpolation
 
-    if ((i & 0x01) !== 0) {
-      f = 1 - f;
-    }
+  let r;
+  let g;
+  let b;
+  switch (i) {
+    default:
+    case 6:
+    case 0:
+      r = v;
+      g = n;
+      b = wh;
+      break;
+    case 1:
+      r = n;
+      g = v;
+      b = wh;
+      break;
+    case 2:
+      r = wh;
+      g = v;
+      b = n;
+      break;
+    case 3:
+      r = wh;
+      g = n;
+      b = v;
+      break;
+    case 4:
+      r = n;
+      g = wh;
+      b = v;
+      break;
+    case 5:
+      r = v;
+      g = wh;
+      b = n;
+      break;
+  }
 
-    n = wh + f * (v - wh); // linear interpolation
+  return [r * 255, g * 255, b * 255];
+}
 
-    let r;
-    let g;
-    let b;
-    switch (i) {
-      default:
-      case 6:
-      case 0:
-        r = v;
-        g = n;
-        b = wh;
-        break;
-      case 1:
-        r = n;
-        g = v;
-        b = wh;
-        break;
-      case 2:
-        r = wh;
-        g = v;
-        b = n;
-        break;
-      case 3:
-        r = wh;
-        g = n;
-        b = v;
-        break;
-      case 4:
-        r = n;
-        g = wh;
-        b = v;
-        break;
-      case 5:
-        r = v;
-        g = wh;
-        b = n;
-        break;
-    }
-
-    return [r * 255, g * 255, b * 255];
-  },
-};
-
-function colorFromString(string) {
+export default function extractColor(string) {
   if (!string || typeof string !== 'string') {
     return null;
   }
 
   const prefix = string.substring(0, 3).toLowerCase();
+
   let value;
-  let model;
+  let converter;
   switch (prefix) {
     case 'hsl':
       value = hslFromString(string);
-      model = 'hsl';
+      converter = hslToRgb;
       break;
     case 'hwb':
       value = hwbFromString(string);
-      model = 'hwb';
+      converter = hwbToRgb;
       break;
     default:
       value = rgbFromString(string);
-      model = 'rgb';
       break;
   }
 
@@ -409,15 +408,5 @@ function colorFromString(string) {
     return null;
   }
 
-  return [model, value];
-}
-
-export default function extractColor(color) {
-  const result = colorFromString(color);
-  if (!result) {
-    return null;
-  }
-  const model = result[0];
-  const value = result[1];
-  return model === 'rgb' ? value : convert[model](value).concat(value[3]);
+  return converter ? converter(value).concat(value[3]) : value;
 }