diff --git a/README.md b/README.md
index c1a5a0d..351a062 100644
--- a/README.md
+++ b/README.md
@@ -39,18 +39,19 @@ module.exports = {
   // ...
 
   treeForPublic() {
-    return new Thumbnail('assets/images');
+    return new Thumbnail('assets/images', { /* options */ });
   }
 };
 ```
 
 ## Options
 
-| Option | Type     | Defaults                      | Description                               |
-|--------|----------|-------------------------------|-------------------------------------------|
-| prefix | `String` | `thumbnail_`                  | Prefix to be added on each thumbnail name |
-| globs  | `Array`  | `['**/*.(jpg|jpeg|gif|png)']` | Files to be processed                     |
-| width  | `Number` | `64`                          | Thumbnail width                           |
+| Option     | Type      | Defaults                        | Description                               |
+|------------|-----------|---------------------------------|-------------------------------------------|
+| prefix     | `String`  | `thumbnail_`                    | Prefix to be added on each thumbnail name |
+| extensions | `Array`   | `['jpg', 'jpeg', 'gif', 'png']` | Files to be processed                     |
+| persist    | `Boolean` | `false`                         | Use disk cache                            |
+| width      | `Number`  | `64`                            | Thumbnail width                           |
 
 ## Versioning
 
diff --git a/lib/thumbnail.js b/lib/thumbnail.js
index 5799d38..ca1e87b 100644
--- a/lib/thumbnail.js
+++ b/lib/thumbnail.js
@@ -1,60 +1,63 @@
 'use strict';
 
-const Plugin = require('broccoli-caching-writer');
+const Filter = require('broccoli-persistent-filter');
+const md5Hex = require('broccoli-persistent-filter/lib/md5-hex');
 const path = require('path');
-const fs = require('fs-extra');
-const walkSync = require('walk-sync');
 const sharp = require('sharp');
 
-async function asyncForEach(array, callback) {
-	for (let index = 0; index < array.length; index++) {
-		await callback(array[index], index, array);
-	}
-}
+class Thumbnail extends Filter {
+	constructor(inputNode, options = {}) {
+		super(inputNode, {
+			persist: options.persist,
+			annotation: 'Thumbnail',
+			'async': true // eslint-disable-line
+		});
 
-class Thumbnail extends Plugin {
-	constructor(inputNode, options) {
-		options = Object.assign({
+		this.options = Object.assign({
 			prefix: 'thumbnail_',
-			globs: [
-				'**/*.{jpg,jpeg,gif,png}'
-			],
+			extensions: ['jpg', 'jpeg', 'gif', 'png'],
 			width: 64
 		}, options);
+	}
 
-		super([inputNode], options);
-		this.options = options;
+	baseDir() {
+		return path.join(__dirname, '..');
 	}
 
-	async build() {
-		const { globs, prefix, width } = this.options;
-		const inputPath = this.inputPaths[0];
-		const allInputFiles = walkSync(inputPath, { directories: false });
-		const images = walkSync(inputPath, { directories: false, globs });
+	getDestFilePath(relativePath) {
+		const { extensions, prefix } = this.options;
+		const ext = path.extname(relativePath).replace(/^\./, '');
 
-		await asyncForEach(images, async(relativePath) => {
-			const absolutePath = path.join(inputPath, relativePath);
+		if (extensions.includes(ext)) {
 			const basename = path.basename(relativePath);
 			const dirname = path.dirname(relativePath);
 			const thumbnailRelativePath = path.join(dirname, `${prefix}${basename}`);
-			const image = sharp(absolutePath);
 
-			await fs.ensureDir(path.join(this.outputPath, dirname));
+			return thumbnailRelativePath;
+		}
+
+		return null;
+	}
 
-			const metadata = await image.metadata();
-			const height = parseInt(metadata.height * width / metadata.width, 10);
+	cacheKeyProcessString(string, relativePath) {
+		return md5Hex(string.length + 0x00 + relativePath);
+	}
 
-			await image
-				.resize(width, height)
-				.toFile(path.join(this.outputPath, thumbnailRelativePath));
-		});
+	async processString(content, relativePath) {
+		const { width } = this.options;
+		const absolutePath = path.resolve(this.inputPaths[0], relativePath);
+		const image = sharp(absolutePath);
+		const metadata = await image.metadata();
+		const height = parseInt(metadata.height * width / metadata.width, 10);
+		const output = await image
+			.resize(width, height)
+			.toBuffer();
 
-		await asyncForEach(allInputFiles, async(relativePath) => {
-			const absolutePath = path.join(inputPath, relativePath);
-			const outputPath = path.join(this.outputPath, relativePath);
+		return { output };
+	}
 
-			await fs.ensureLink(absolutePath, outputPath);
-		});
+	postProcess(results) {
+		return { output: results.output };
 	}
 }
 
diff --git a/package-lock.json b/package-lock.json
index 8b9e8e5..d175b23 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "broccoli-thumbnail",
-  "version": "1.0.0",
+  "version": "0.0.0-development",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1587,6 +1587,39 @@
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
+    "async-disk-cache": {
+      "version": "1.3.4",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/async-disk-cache/-/async-disk-cache-1.3.4.tgz?dl=https://registry.npmjs.org/async-disk-cache/-/async-disk-cache-1.3.4.tgz",
+      "integrity": "sha1-pcn3LxmamTNYNln1eg4RN3iE+BY=",
+      "requires": {
+        "debug": "^2.1.3",
+        "heimdalljs": "^0.2.3",
+        "istextorbinary": "2.1.0",
+        "mkdirp": "^0.5.0",
+        "rimraf": "^2.5.3",
+        "rsvp": "^3.0.18",
+        "username-sync": "^1.0.2"
+      }
+    },
+    "async-promise-queue": {
+      "version": "1.0.4",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/async-promise-queue/-/async-promise-queue-1.0.4.tgz?dl=https://registry.npmjs.org/async-promise-queue/-/async-promise-queue-1.0.4.tgz",
+      "integrity": "sha1-MIuq+8dK/2agu25/ShjU/oQ0RAw=",
+      "requires": {
+        "async": "^2.4.1",
+        "debug": "^2.6.8"
+      },
+      "dependencies": {
+        "async": {
+          "version": "2.6.2",
+          "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/async/-/async-2.6.2.tgz?dl=https://registry.npmjs.org/async/-/async-2.6.2.tgz",
+          "integrity": "sha1-GDMOp+bjE4h/XS8qkEusb+TdU4E=",
+          "requires": {
+            "lodash": "^4.17.11"
+          }
+        }
+      }
+    },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/atob/-/atob-2.1.2.tgz?dl=https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
@@ -1688,6 +1721,11 @@
       "integrity": "sha1-EHnBAxLNTUrQ0WdtN5Ue+L/DpWM=",
       "dev": true
     },
+    "binaryextensions": {
+      "version": "2.1.2",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/binaryextensions/-/binaryextensions-2.1.2.tgz?dl=https://registry.npmjs.org/binaryextensions/-/binaryextensions-2.1.2.tgz",
+      "integrity": "sha1-yDw9dCM7p2dOTzE8sqK3D1TpS3w="
+    },
     "bindings": {
       "version": "1.3.1",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/bindings/-/bindings-1.3.1.tgz?dl=https://registry.npmjs.org/bindings/-/bindings-1.3.1.tgz",
@@ -1970,6 +2008,42 @@
       "integrity": "sha1-OqLjHgflvbUW3SUhT3xFuhxFlBI=",
       "dev": true
     },
+    "broccoli-persistent-filter": {
+      "version": "2.1.1",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/broccoli-persistent-filter/-/broccoli-persistent-filter-2.1.1.tgz?dl=https://registry.npmjs.org/broccoli-persistent-filter/-/broccoli-persistent-filter-2.1.1.tgz",
+      "integrity": "sha1-e7KxAVuu31z1i1smCElfPXj4GxI=",
+      "requires": {
+        "async-disk-cache": "^1.2.1",
+        "async-promise-queue": "^1.0.3",
+        "broccoli-plugin": "^1.0.0",
+        "fs-tree-diff": "^0.5.2",
+        "hash-for-dep": "^1.0.2",
+        "heimdalljs": "^0.2.1",
+        "heimdalljs-logger": "^0.1.7",
+        "mkdirp": "^0.5.1",
+        "promise-map-series": "^0.2.1",
+        "rimraf": "^2.6.1",
+        "rsvp": "^4.7.0",
+        "symlink-or-copy": "^1.0.1",
+        "walk-sync": "^0.3.1"
+      },
+      "dependencies": {
+        "rsvp": {
+          "version": "4.8.4",
+          "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/rsvp/-/rsvp-4.8.4.tgz?dl=https://registry.npmjs.org/rsvp/-/rsvp-4.8.4.tgz",
+          "integrity": "sha1-tQ5rNFg/PdiTKaLyOoor4HKEWRE="
+        },
+        "walk-sync": {
+          "version": "0.3.4",
+          "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/walk-sync/-/walk-sync-0.3.4.tgz?dl=https://registry.npmjs.org/walk-sync/-/walk-sync-0.3.4.tgz",
+          "integrity": "sha1-z3hIbMVn06lrWyI3xhCAF6X/uaQ=",
+          "requires": {
+            "ensure-posix-path": "^1.0.0",
+            "matcher-collection": "^1.0.0"
+          }
+        }
+      }
+    },
     "broccoli-plugin": {
       "version": "1.3.1",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/broccoli-plugin/-/broccoli-plugin-1.3.1.tgz?dl=https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-1.3.1.tgz",
@@ -2979,6 +3053,11 @@
       "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
       "dev": true
     },
+    "editions": {
+      "version": "1.3.4",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/editions/-/editions-1.3.4.tgz?dl=https://registry.npmjs.org/editions/-/editions-1.3.4.tgz",
+      "integrity": "sha1-NmLLWSNHwxaOuOSYoP9zJx1n9Qs="
+    },
     "ee-first": {
       "version": "1.1.1",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/ee-first/-/ee-first-1.1.1.tgz?dl=https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
@@ -3914,7 +3993,6 @@
       "version": "0.5.9",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/fs-tree-diff/-/fs-tree-diff-0.5.9.tgz?dl=https://registry.npmjs.org/fs-tree-diff/-/fs-tree-diff-0.5.9.tgz",
       "integrity": "sha1-pOxhgsL1vYC5uDyOI+RSLm9f2UY=",
-      "dev": true,
       "requires": {
         "heimdalljs-logger": "^0.1.7",
         "object-assign": "^4.1.0",
@@ -4343,6 +4421,18 @@
         }
       }
     },
+    "hash-for-dep": {
+      "version": "1.4.5",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/hash-for-dep/-/hash-for-dep-1.4.5.tgz?dl=https://registry.npmjs.org/hash-for-dep/-/hash-for-dep-1.4.5.tgz",
+      "integrity": "sha1-JLLTjRS8W43g6JG68v6umCZAngg=",
+      "requires": {
+        "broccoli-kitchen-sink-helpers": "^0.3.1",
+        "heimdalljs": "^0.2.3",
+        "heimdalljs-logger": "^0.1.7",
+        "path-root": "^0.1.1",
+        "resolve": "^1.4.0"
+      }
+    },
     "he": {
       "version": "1.1.1",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/he/-/he-1.1.1.tgz?dl=https://registry.npmjs.org/he/-/he-1.1.1.tgz",
@@ -4353,7 +4443,6 @@
       "version": "0.2.6",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/heimdalljs/-/heimdalljs-0.2.6.tgz?dl=https://registry.npmjs.org/heimdalljs/-/heimdalljs-0.2.6.tgz",
       "integrity": "sha1-sO66vEEoE665VC+cxiLLWNvc2f4=",
-      "dev": true,
       "requires": {
         "rsvp": "~3.2.1"
       },
@@ -4361,8 +4450,7 @@
         "rsvp": {
           "version": "3.2.1",
           "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/rsvp/-/rsvp-3.2.1.tgz?dl=http://registry.npmjs.org/rsvp/-/rsvp-3.2.1.tgz",
-          "integrity": "sha1-B8tKXfJa3Z6Cbrxn3Mn9idsn2Eo=",
-          "dev": true
+          "integrity": "sha1-B8tKXfJa3Z6Cbrxn3Mn9idsn2Eo="
         }
       }
     },
@@ -4370,7 +4458,6 @@
       "version": "0.1.10",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/heimdalljs-logger/-/heimdalljs-logger-0.1.10.tgz?dl=https://registry.npmjs.org/heimdalljs-logger/-/heimdalljs-logger-0.1.10.tgz",
       "integrity": "sha1-kMrViquxWQo8fmQN3GpM06Q/qvc=",
-      "dev": true,
       "requires": {
         "debug": "^2.2.0",
         "heimdalljs": "^0.2.6"
@@ -5155,6 +5242,16 @@
         "semver": "^5.5.0"
       }
     },
+    "istextorbinary": {
+      "version": "2.1.0",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/istextorbinary/-/istextorbinary-2.1.0.tgz?dl=https://registry.npmjs.org/istextorbinary/-/istextorbinary-2.1.0.tgz",
+      "integrity": "sha1-2+0qb1G+L3R1to+JRlgRFBt1iHQ=",
+      "requires": {
+        "binaryextensions": "1 || 2",
+        "editions": "^1.1.1",
+        "textextensions": "1 || 2"
+      }
+    },
     "java-properties": {
       "version": "0.2.10",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/java-properties/-/java-properties-0.2.10.tgz?dl=https://registry.npmjs.org/java-properties/-/java-properties-0.2.10.tgz",
@@ -5327,8 +5424,7 @@
     "lodash": {
       "version": "4.17.11",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/lodash/-/lodash-4.17.11.tgz?dl=https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-      "integrity": "sha1-s56mIp72B+zYniyN8SU2iRysm40=",
-      "dev": true
+      "integrity": "sha1-s56mIp72B+zYniyN8SU2iRysm40="
     },
     "lodash._reinterpolate": {
       "version": "3.0.0",
@@ -9561,7 +9657,7 @@
       "dependencies": {
         "align-text": {
           "version": "0.1.4",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
           "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
           "dev": true,
           "requires": {
@@ -9572,19 +9668,19 @@
         },
         "amdefine": {
           "version": "1.0.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
           "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
           "dev": true
         },
         "ansi-regex": {
           "version": "3.0.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
           "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
           "dev": true
         },
         "append-transform": {
           "version": "1.0.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
           "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
           "dev": true,
           "requires": {
@@ -9593,31 +9689,31 @@
         },
         "archy": {
           "version": "1.0.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
           "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
           "dev": true
         },
         "arrify": {
           "version": "1.0.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
           "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
           "dev": true
         },
         "async": {
           "version": "1.5.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
           "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
           "dev": true
         },
         "balanced-match": {
           "version": "1.0.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
           "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
           "dev": true
         },
         "brace-expansion": {
           "version": "1.1.11",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
           "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
           "dev": true,
           "requires": {
@@ -9627,13 +9723,13 @@
         },
         "builtin-modules": {
           "version": "1.1.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
           "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
           "dev": true
         },
         "caching-transform": {
           "version": "2.0.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-2.0.0.tgz",
           "integrity": "sha512-tTfemGmFWe7KZ3KN6VsSgQZbd9Bgo7A40wlp4PTsJJvFu4YAnEC5YnfdiKq6Vh2i9XJLnA9n8OXD46orVpnPMw==",
           "dev": true,
           "requires": {
@@ -9645,14 +9741,14 @@
         },
         "camelcase": {
           "version": "1.2.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
           "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
           "dev": true,
           "optional": true
         },
         "center-align": {
           "version": "0.1.3",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
           "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
           "dev": true,
           "optional": true,
@@ -9663,7 +9759,7 @@
         },
         "cliui": {
           "version": "2.1.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
           "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
           "dev": true,
           "optional": true,
@@ -9675,7 +9771,7 @@
           "dependencies": {
             "wordwrap": {
               "version": "0.0.2",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
               "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
               "dev": true,
               "optional": true
@@ -9684,25 +9780,25 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
           "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
           "dev": true
         },
         "commondir": {
           "version": "1.0.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/commondir/-/commondir-1.0.1.tgz",
           "integrity": "sha1-3dgA2gxmEnOTzKWVDqloo6rxJTs=",
           "dev": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
           "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
           "dev": true
         },
         "convert-source-map": {
           "version": "1.6.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
           "integrity": "sha512-eFu7XigvxdZ1ETfbgPBohgyQ/Z++C0eEhTor0qRwBw9unw+L0/6V8wkSuGgzdThkiS5lSpdptOQPD8Ak40a+7A==",
           "dev": true,
           "requires": {
@@ -9711,7 +9807,7 @@
         },
         "cross-spawn": {
           "version": "4.0.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-4.0.2.tgz",
           "integrity": "sha1-e5JHYhwjrf3ThWAEqCPL45dCTUE=",
           "dev": true,
           "requires": {
@@ -9721,7 +9817,7 @@
         },
         "debug": {
           "version": "3.1.0",
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-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
               "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
               "dev": true,
               "requires": {
@@ -10694,13 +10790,13 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
           "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
           "dev": true
         },
         "write-file-atomic": {
           "version": "2.3.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
           "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
           "dev": true,
           "requires": {
@@ -10711,19 +10807,19 @@
         },
         "y18n": {
           "version": "3.2.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
           "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
           "dev": true
         },
         "yallist": {
           "version": "2.1.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
           "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
           "dev": true
         },
         "yargs": {
           "version": "11.1.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
           "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
           "dev": true,
           "requires": {
@@ -10743,7 +10839,7 @@
           "dependencies": {
             "cliui": {
               "version": "4.1.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
               "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
               "dev": true,
               "requires": {
@@ -10754,7 +10850,7 @@
             },
             "find-up": {
               "version": "2.1.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
               "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
               "dev": true,
               "requires": {
@@ -10763,7 +10859,7 @@
             },
             "locate-path": {
               "version": "2.0.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-2.0.0.tgz",
               "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
               "dev": true,
               "requires": {
@@ -10773,7 +10869,7 @@
             },
             "p-limit": {
               "version": "1.3.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.3.0.tgz",
               "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
               "dev": true,
               "requires": {
@@ -10782,7 +10878,7 @@
             },
             "p-locate": {
               "version": "2.0.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
               "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
               "dev": true,
               "requires": {
@@ -10791,7 +10887,7 @@
             },
             "p-try": {
               "version": "1.0.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
               "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=",
               "dev": true
             }
@@ -10799,7 +10895,7 @@
         },
         "yargs-parser": {
           "version": "9.0.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
           "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
           "dev": true,
           "requires": {
@@ -10808,7 +10904,7 @@
           "dependencies": {
             "camelcase": {
               "version": "4.1.0",
-              "resolved": false,
+              "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
               "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
               "dev": true
             }
@@ -11232,14 +11328,25 @@
     "path-parse": {
       "version": "1.0.6",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/path-parse/-/path-parse-1.0.6.tgz?dl=https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
-      "integrity": "sha1-1i27VnlAXXLEc37FhgDp3c8G0kw=",
-      "dev": true
+      "integrity": "sha1-1i27VnlAXXLEc37FhgDp3c8G0kw="
     },
     "path-posix": {
       "version": "1.0.0",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/path-posix/-/path-posix-1.0.0.tgz?dl=https://registry.npmjs.org/path-posix/-/path-posix-1.0.0.tgz",
-      "integrity": "sha1-BrJhE/Vr6rBCVFojv6iAA8ysJg8=",
-      "dev": true
+      "integrity": "sha1-BrJhE/Vr6rBCVFojv6iAA8ysJg8="
+    },
+    "path-root": {
+      "version": "0.1.1",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/path-root/-/path-root-0.1.1.tgz?dl=https://registry.npmjs.org/path-root/-/path-root-0.1.1.tgz",
+      "integrity": "sha1-mkpoFMrBwM1zNgqV8yCDyOpHRbc=",
+      "requires": {
+        "path-root-regex": "^0.1.0"
+      }
+    },
+    "path-root-regex": {
+      "version": "0.1.2",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/path-root-regex/-/path-root-regex-0.1.2.tgz?dl=https://registry.npmjs.org/path-root-regex/-/path-root-regex-0.1.2.tgz",
+      "integrity": "sha1-v8zcjfWxLcUsi0PsONGNcsBLqW0="
     },
     "path-type": {
       "version": "3.0.0",
@@ -11762,7 +11869,6 @@
       "version": "1.9.0",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/resolve/-/resolve-1.9.0.tgz?dl=https://registry.npmjs.org/resolve/-/resolve-1.9.0.tgz",
       "integrity": "sha1-oUxv36j5Kn3x2ZbLcQX6dEZY6gY=",
-      "dev": true,
       "requires": {
         "path-parse": "^1.0.6"
       }
@@ -12740,6 +12846,11 @@
       "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
       "dev": true
     },
+    "textextensions": {
+      "version": "2.4.0",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/textextensions/-/textextensions-2.4.0.tgz?dl=https://registry.npmjs.org/textextensions/-/textextensions-2.4.0.tgz",
+      "integrity": "sha1-ahQ6mFRkOEzCz/Ea6kSM1bAY5ys="
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/through/-/through-2.3.8.tgz?dl=http://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -13161,6 +13272,11 @@
       "integrity": "sha1-1QyMrHmhn7wg8pEfVuuXP04QBw8=",
       "dev": true
     },
+    "username-sync": {
+      "version": "1.0.2",
+      "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/username-sync/-/username-sync-1.0.2.tgz?dl=https://registry.npmjs.org/username-sync/-/username-sync-1.0.2.tgz",
+      "integrity": "sha1-CjaXkJ+3tXaNKeKSH1c6z91CdZI="
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://descinet.bbva.es/artifactory/api/npm/npm/util-deprecate/-/util-deprecate-1.0.2.tgz?dl=https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
diff --git a/package.json b/package.json
index 0a3f5ca..d8d9cf9 100644
--- a/package.json
+++ b/package.json
@@ -66,8 +66,8 @@
   },
   "dependencies": {
     "broccoli-caching-writer": "^3.0.3",
+    "broccoli-persistent-filter": "^2.1.1",
     "fs-extra": "^7.0.1",
-    "sharp": "^0.21.1",
-    "walk-sync": "^1.0.1"
+    "sharp": "^0.21.1"
   }
 }
diff --git a/tests/thumbnail-test.js b/tests/thumbnail-test.js
index c3bf65d..c71dade 100644
--- a/tests/thumbnail-test.js
+++ b/tests/thumbnail-test.js
@@ -11,7 +11,7 @@ const Thumbnail = require('..');
 const createBuilder = testHelpers.createBuilder;
 const createTempDir = testHelpers.createTempDir;
 
-describe('broccoli-lint-remark', function() {
+describe('broccoli-thumbnail', function() {
 	let input, output;
 
 	beforeEach(async function() {
@@ -32,28 +32,41 @@ describe('broccoli-lint-remark', function() {
 		expect(Thumbnail).to.exist; // eslint-disable-line
 	});
 
+	it('implements "baseDir()"', function() {
+		const pluginInstance = new Thumbnail('foo');
+
+		expect(pluginInstance.baseDir).to.be.a('function');
+		expect(pluginInstance.baseDir()).to.be.equal(process.cwd());
+	});
+
+	it('implements "cacheKeyProcessString()"', function() {
+		const pluginInstance = new Thumbnail('foo');
+
+		expect(pluginInstance.cacheKeyProcessString).to.be.a('function');
+		expect(pluginInstance.cacheKeyProcessString('a', 'b')).to.be.equal('a35aea60fe097c885568babb48ee7d1e');
+	});
+
 	it('links all the existing files', async function() {
 		input.write({
 			'a.txt': 'a.txt',
 			'a.log': 'a.log'
 		});
 		const tree = new Funnel(input.path());
-		const pluginInstance = new Thumbnail(tree, { globs: [] });
+		const pluginInstance = new Thumbnail(tree);
 
 		output = createBuilder(pluginInstance);
 
 		await output.build();
 
-		expect(Object.keys(output.read())).to.deep.equal(['a.log', 'a.txt', 'troll.jpg']);
+		expect(Object.keys(output.read())).to.deep.equal(['a.log', 'a.txt', 'thumbnail_troll.jpg']);
 	});
 
-	it('generates thumbnails given a prefix and a glob', async function() {
+	it('generates thumbnails given a prefix', async function() {
 		const filename = 'troll.jpg';
 		const prefix = 'prefix_';
 		const tree = new Funnel(input.path());
 		const pluginInstance = new Thumbnail(tree, {
-			prefix,
-			globs: [filename]
+			prefix
 		});
 
 		output = createBuilder(pluginInstance);
@@ -70,7 +83,7 @@ describe('broccoli-lint-remark', function() {
 		const tree = new Funnel(input.path());
 		const pluginInstance = new Thumbnail(tree, {
 			prefix,
-			globs: [filename],
+			extensions: ['jpg'],
 			width
 		});