extract isRgbaFloat (#813)

src/transformers/colorToRgbaFloat.ts

@@ -5,6 +5,7 @@ import {getTokenValue} from './utilities/getTokenValue'
 import {rgbaFloatToHex} from './utilities/rgbaFloatToHex'
 import mix from './utilities/mix'
 import {hexToRgbaFloat} from './utilities/hexToRgbaFloat'
+import {isRgbaFloat} from './utilities/isRgbaFloat'
 
 const toRgbaFloat = (token: StyleDictionary.TransformedToken, alpha?: number) => {
   let tokenValue = getTokenValue(token)
@@ -25,23 +26,6 @@ const toRgbaFloat = (token: StyleDictionary.TransformedToken, alpha?: number) =>
   return hexToRgbaFloat(hex, alpha)
 }
 
-// sum up the values of all values in an array
-const sum = (array: unknown[]): number => array.reduce((acc: number, v: unknown) => acc + parseInt(`${v}`), 0)
-
-const isRgbaFloat = (value: unknown) => {
-  if (
-    value &&
-    typeof value === `object` &&
-    'r' in value &&
-    'g' in value &&
-    'b' in value &&
-    sum([value.r, value.g, value.b]) < 5
-  ) {
-    return true
-  }
-  return false
-}
-
 /**
  * @description converts color tokens rgba float with values from 0 - 1
  * @type value transformer — [StyleDictionary.ValueTransform](https://github.com/amzn/style-dictionary/blob/main/types/Transform.d.ts)

src/transformers/utilities/hexToRgbaFloat.ts

@@ -1,9 +1,4 @@
-type RgbaFloat = {
-  r: number
-  g: number
-  b: number
-  a?: number
-}
+import type {RgbaFloat} from './isRgbaFloat'
 
 export const hexToRgbaFloat = (hex: string, alpha?: number): RgbaFloat => {
   // retrieve spots from hex value (hex 3, hex 4, hex 6 or hex 8)

src/transformers/utilities/isRgbaFloat.ts

@@ -0,0 +1,23 @@
+export type RgbaFloat = {
+  r: number
+  g: number
+  b: number
+  a?: number
+}
+
+// sum up the values of all values in an array
+const sum = (array: unknown[]): number => array.reduce((acc: number, v: unknown) => acc + parseInt(`${v}`), 0)
+// check if a value is an rgba float object
+export const isRgbaFloat = (value: unknown): value is RgbaFloat => {
+  if (
+    value &&
+    typeof value === `object` &&
+    'r' in value &&
+    'g' in value &&
+    'b' in value &&
+    sum([value.r, value.g, value.b]) < 5
+  ) {
+    return true
+  }
+  return false
+}