feat(Image): Add metadata property

Closes #394

Author: thewtex

src/core/Image.ts

@@ -13,6 +13,8 @@ class Image {
 
   size: number[]
 
+  metadata: Record<string, string | number | number[] | number[][]>
+
   data: null | TypedArray
 
   constructor (public readonly imageType = new ImageType()) {
@@ -32,6 +34,8 @@ class Image {
     this.size = new Array(dimension)
     this.size.fill(0)
 
+    this.metadata = {}
+
     this.data = null
   }
 }

test/node/core/ImageTest.js

@@ -70,6 +70,12 @@ test('size should have a default value of 0', t => {
   t.is(image.size[0], 0)
 })
 
+test('metadata should be an object', t => {
+  const imageType = new ImageType(2)
+  const image = new Image(imageType)
+  t.is(typeof image.metadata, 'object')
+})
+
 test('data should have a default value of null', t => {
   const imageType = new ImageType(2)
   const image = new Image(imageType)