> QA feedback

lib/blur.js

@@ -45,24 +45,22 @@ class Blur extends DarkroomStream {
     return mask
   }
 
-  _createSVG(type, image, size) {
+  _createSvg(mask, type, image, size) {
     const base64 = image.toString('base64')
     const xml = `<svg height="${size.height}" width="${size.width}" xmlns="http://www.w3.org/2000/svg">
-      ${this.mask}
+      ${mask}
       <filter id="blur">
         <feGaussianBlur in="SourceGraphic" stdDeviation="${this.blurAmount}" />
       </filter>
       <image height="${size.height}" width="${size.width}" href="data:${type.mime};;base64,${base64}" />
       <image clip-path="url(#mask)" filter="url(#blur)" height="${size.height}" width="${size.width}" href="data:${type.mime};base64,${base64}" />
     </svg>`
 
-    const mask = Buffer.from(xml)
-
-    return mask
+    return Buffer.from(xml)
   }
 
-  _createBlurred(cb) {
-    const outImage = sharp(this.svg)
+  _createBlurred(svg, cb) {
+    const outImage = sharp(svg)
 
     if (this.format) {
       outImage.toFormat(this.format, { quality: this.quality })
@@ -94,14 +92,16 @@ class Blur extends DarkroomStream {
         this.format = imageFileType.ext
       }
 
+      let svg
+
       try {
-        this.mask = this._createMask(info)
-        this.svg = this._createSVG(imageFileType, image, info)
+        const mask = this._createMask(info)
+        svg = this._createSvg(mask, imageFileType, image, info)
       } catch (e) {
         return this.output(e)
       }
 
-      this._createBlurred((error, output) => {
+      this._createBlurred(svg, (error, output) => {
         if (error) return this.output(error)
         this.output(null, output)
       })