diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..04fb60b
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,17 @@
+{
+  "presets": [
+    ["env", {
+      "targets": {
+        "node": "4"
+      }
+    }]
+  ],
+  "plugins": [
+    ["transform-runtime", {
+      "helpers": false,
+      "polyfill": false,
+      "regenerator": true,
+      "moduleName": "babel-runtime"
+    }]
+  ]
+}
diff --git a/.gitignore b/.gitignore
index 49d06bd..2be8a1e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ output
 npm-shrinkwrap.json
 .nyc_output/
 coverage/
+dist
diff --git a/.npmignore b/.npmignore
index e92118c..69c982b 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,9 +1,4 @@
 node_modules
 output
-test
-Gruntfile.js
-typings
-.editorconfig
-.travis.yml
-.gitignore
-CONTRIBUTING.md
+.nyc_output/
+coverage/
diff --git a/lib/axe-injector.js b/lib/axe-injector.js
new file mode 100644
index 0000000..1e42582
--- /dev/null
+++ b/lib/axe-injector.js
@@ -0,0 +1,82 @@
+class AxeInjector {
+  constructor({ driver, config, axeSource = null }) {
+    this.driver = driver;
+    this.axeSource = axeSource || require('axe-core').source;
+    this.config = config ? JSON.stringify(config) : '';
+
+    this.didLogError = false;
+    this.errorHandler = this.errorHandler.bind(this);
+  }
+
+  // Single-shot error handler. Ensures we don't log more than once.
+  errorHandler() {
+    // We've already "warned" the user. No need to do it again (mostly for backwards compatiability)
+    if (this.didLogError) {
+      return;
+    }
+
+    this.didLogError = true;
+    // eslint-disable-next-line no-console
+    console.log('Failed to inject axe-core into one of the iframes!');
+  }
+
+  // Get axe-core source (and configuration)
+  get script() {
+    return `
+      ${this.axeSource}
+      ${this.config ? `axe.configure(${this.config})` : ''}
+      axe.configure({ branding: { application: 'webdriverjs' } })
+    `;
+  }
+
+  // Inject into the provided `frame` and its child `frames`
+  async handleFrame(frame) {
+    // Switch context to the frame and inject our `script` into it
+    await this.driver.switchTo().frame(frame);
+    await this.driver.executeScript(this.script);
+
+    // Get all of <iframe>s at this level
+    const frames = await this.driver.findElements({ tagName: 'iframe' });
+
+    // Inject into each frame. Handling errors to ensure an issue on a single frame won't stop the rest of the injections.
+    return Promise.all(
+      frames.map(childFrame =>
+        this.handleFrame(childFrame).catch(this.errorHandler)
+      )
+    );
+  }
+
+  // Inject into all frames.
+  async injectIntoAllFrames() {
+    // Ensure we're "starting" our loop at the top-most frame
+    await this.driver.switchTo().defaultContent();
+
+    // Inject the script into the top-level
+    // XXX: if this `executeScript` fails, we *want* to error, as we cannot run axe-core.
+    await this.driver.executeScript(this.script);
+
+    // Get all of <iframe>s at this level
+    const frames = await this.driver.findElements({ tagName: 'iframe' });
+
+    // Inject the script into all child frames. Handle errors to ensure we don't stop execution if we fail to inject.
+    await Promise.all(
+      frames.map(childFrame =>
+        this.handleFrame(childFrame).catch(this.errorHandler)
+      )
+    );
+
+    // Move back to the top-most frame
+    return this.driver.switchTo().defaultContent();
+  }
+
+  // Inject axe, invoking the provided callback when done
+  inject(callback) {
+    this.injectIntoAllFrames()
+      .then(() => callback())
+      // For now, we intentionally ignore errors here, as
+      // allowing them to bubble up would be a breaking change.
+      .catch(() => callback());
+  }
+}
+
+module.exports = AxeInjector;
diff --git a/lib/index.js b/lib/index.js
index 52fa78a..1e262c0 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,5 +1,5 @@
-var inject = require('./inject'),
-  normalizeContext = require('./normalize-context');
+var AxeInjector = require('./axe-injector');
+var normalizeContext = require('./normalize-context');
 
 /**
  * Constructor for chainable WebDriver API
@@ -129,7 +129,8 @@ AxeBuilder.prototype.analyze = function(callback) {
     source = this._source;
 
   return new Promise(function(resolve) {
-    inject(driver, source, config, function() {
+    var injector = new AxeInjector({ driver, axeSource: source, config });
+    injector.inject(() => {
       driver
         .executeAsyncScript(
           function(context, options, config) {
diff --git a/lib/inject.js b/lib/inject.js
deleted file mode 100644
index c18c978..0000000
--- a/lib/inject.js
+++ /dev/null
@@ -1,67 +0,0 @@
-/**
- * Recursively find frames and inject a script into them
- * @private
- * @param  {Array}  parent Array of parent frames; or falsey if top level frame
- * @param  {String} script The script to inject
- * @param  {WebDriver} driver The driver to inject into
- */
-function findFramesAndInject(parent, script, driver) {
-  driver
-    .findElements({
-      tagName: 'iframe'
-    })
-    .then(function(results) {
-      results.forEach(function(frame) {
-        driver.switchTo().defaultContent();
-        if (parent) {
-          parent.forEach(function(p) {
-            driver.switchTo().frame(p);
-          });
-        }
-        driver
-          .switchTo()
-          .frame(frame)
-          .then(function() {
-            driver.executeScript(script).then(function() {
-              findFramesAndInject((parent || []).concat(frame), script, driver);
-            });
-          })
-          .catch(function() {
-            // eslint-disable-next-line no-console
-            console.log('Failed to inject axe-core into one of the iframes!');
-            driver.switchTo().defaultContent();
-          });
-      });
-    });
-}
-
-/**
- * Recursively inject aXe into all iframes and top level document, then execute a callback when complete
- * @private
- * @param  {WebDriver}   driver   Instance of WebDriver to inject into
- * @param  {String}	  axeSource   Optional Attest source and configure string
- * @param  {Object}   config      Optional configure object to pass to iframes
- * @param  {Function} callback    Callback to execute when aXe has been injected
- */
-module.exports = function(driver, axeSource, config, callback) {
-  axeSource = axeSource || require('axe-core').source;
-
-  var configSrc =
-    config !== null ? 'axe.configure(' + JSON.stringify(config) + ');' : '';
-  var script =
-    axeSource +
-    configSrc +
-    'axe.configure({branding:{application:"webdriverjs"}});';
-
-  driver.switchTo().defaultContent();
-
-  driver
-    .executeScript(script)
-    .then(function() {
-      findFramesAndInject(null, script, driver);
-    })
-    .then(function() {
-      driver.switchTo().defaultContent();
-      callback();
-    });
-};
diff --git a/package-lock.json b/package-lock.json
index 3b55573..04f98ab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -207,6 +207,125 @@
       "integrity": "sha512-/FQM1EDkTsf63Ub2C6O7GuYFDsSXUwsaZDurV0np41ocwq0jthUAYCmhBX9f+KwlaCgIuWyr/4WlUQUBfKfZog==",
       "dev": true
     },
+    "anymatch": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
+      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
+      },
+      "dependencies": {
+        "arr-diff": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
+          "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "arr-flatten": "^1.0.1"
+          }
+        },
+        "array-unique": {
+          "version": "0.2.1",
+          "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
+          "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
+          "dev": true,
+          "optional": true
+        },
+        "braces": {
+          "version": "1.8.5",
+          "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz",
+          "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "expand-range": "^1.8.1",
+            "preserve": "^0.2.0",
+            "repeat-element": "^1.1.2"
+          }
+        },
+        "expand-brackets": {
+          "version": "0.1.5",
+          "resolved": "https://registry.npmjs.org/expand-brackets/-/expand-brackets-0.1.5.tgz",
+          "integrity": "sha1-3wcoTjQqgHzXM6xa9yQR5YHRF3s=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "is-posix-bracket": "^0.1.0"
+          }
+        },
+        "extglob": {
+          "version": "0.3.2",
+          "resolved": "https://registry.npmjs.org/extglob/-/extglob-0.3.2.tgz",
+          "integrity": "sha1-Lhj/PS9JqydlzskCPwEdqo2DSaE=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "is-extglob": "^1.0.0"
+          }
+        },
+        "is-extglob": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
+          "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
+          "dev": true
+        },
+        "is-glob": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
+          "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "is-extglob": "^1.0.0"
+          }
+        },
+        "kind-of": {
+          "version": "3.2.2",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+          "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "is-buffer": "^1.1.5"
+          }
+        },
+        "micromatch": {
+          "version": "2.3.11",
+          "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-2.3.11.tgz",
+          "integrity": "sha1-hmd8l9FyCzY0MdBNDRUpO9OMFWU=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "arr-diff": "^2.0.0",
+            "array-unique": "^0.2.1",
+            "braces": "^1.8.2",
+            "expand-brackets": "^0.1.4",
+            "extglob": "^0.3.1",
+            "filename-regex": "^2.0.0",
+            "is-extglob": "^1.0.0",
+            "is-glob": "^2.0.1",
+            "kind-of": "^3.0.2",
+            "normalize-path": "^2.0.1",
+            "object.omit": "^2.0.0",
+            "parse-glob": "^3.0.4",
+            "regex-cache": "^0.4.2"
+          }
+        },
+        "normalize-path": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
+          "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+          "dev": true,
+          "requires": {
+            "remove-trailing-separator": "^1.0.1"
+          }
+        }
+      }
+    },
     "app-root-path": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/app-root-path/-/app-root-path-2.0.1.tgz",
@@ -285,6 +404,13 @@
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
+    "async-each": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
+      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "dev": true,
+      "optional": true
+    },
     "atob": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.1.tgz",
@@ -296,6 +422,29 @@
       "resolved": "https://registry.npmjs.org/axe-core/-/axe-core-3.0.0.tgz",
       "integrity": "sha512-wiN3mLDxkdjfHaSstkxEHzx+WFN9X520FBOA1z5T1jKbUcLqM+0wmhrhmesoaQknvjjaPq5uf0key7EXacmr0A=="
     },
+    "babel-cli": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-cli/-/babel-cli-6.26.0.tgz",
+      "integrity": "sha1-UCq1SHTX24itALiHoGODzgPQAvE=",
+      "dev": true,
+      "requires": {
+        "babel-core": "^6.26.0",
+        "babel-polyfill": "^6.26.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "chokidar": "^1.6.1",
+        "commander": "^2.11.0",
+        "convert-source-map": "^1.5.0",
+        "fs-readdir-recursive": "^1.0.0",
+        "glob": "^7.1.2",
+        "lodash": "^4.17.4",
+        "output-file-sync": "^1.1.2",
+        "path-is-absolute": "^1.0.1",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.6",
+        "v8flags": "^2.1.1"
+      }
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -331,860 +480,826 @@
         }
       }
     },
-    "balanced-match": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
+    "babel-core": {
+      "version": "6.26.3",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.3.tgz",
+      "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
+      "dev": true,
+      "requires": {
+        "babel-code-frame": "^6.26.0",
+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.8",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.7"
+      }
     },
-    "base": {
-      "version": "0.11.2",
-      "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
-      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
+    "babel-eslint": {
+      "version": "8.2.3",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.2.3.tgz",
+      "integrity": "sha512-0HeSTtaXg/Em7FCUWxwOT+KeFSO1O7LuRuzhk7g+1BjwdlQGlHq4OyMi3GqGxrNfEq8jEi6Hmt5ylEQUhurgiQ==",
       "dev": true,
       "requires": {
-        "cache-base": "^1.0.1",
-        "class-utils": "^0.3.5",
-        "component-emitter": "^1.2.1",
-        "define-property": "^1.0.0",
-        "isobject": "^3.0.1",
-        "mixin-deep": "^1.2.0",
-        "pascalcase": "^0.1.1"
+        "@babel/code-frame": "7.0.0-beta.44",
+        "@babel/traverse": "7.0.0-beta.44",
+        "@babel/types": "7.0.0-beta.44",
+        "babylon": "7.0.0-beta.44",
+        "eslint-scope": "~3.7.1",
+        "eslint-visitor-keys": "^1.0.0"
       },
       "dependencies": {
-        "define-property": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
-          "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
+        "@babel/code-frame": {
+          "version": "7.0.0-beta.44",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz",
+          "integrity": "sha512-cuAuTTIQ9RqcFRJ/Y8PvTh+paepNcaGxwQwjIDRWPXmzzyAeCO4KqS9ikMvq0MCbRk6GlYKwfzStrcP3/jSL8g==",
           "dev": true,
           "requires": {
-            "is-descriptor": "^1.0.0"
+            "@babel/highlight": "7.0.0-beta.44"
           }
         },
-        "is-accessor-descriptor": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
-          "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
+        "@babel/generator": {
+          "version": "7.0.0-beta.44",
+          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.44.tgz",
+          "integrity": "sha512-5xVb7hlhjGcdkKpMXgicAVgx8syK5VJz193k0i/0sLP6DzE6lRrU1K3B/rFefgdo9LPGMAOOOAWW4jycj07ShQ==",
           "dev": true,
           "requires": {
-            "kind-of": "^6.0.0"
+            "@babel/types": "7.0.0-beta.44",
+            "jsesc": "^2.5.1",
+            "lodash": "^4.2.0",
+            "source-map": "^0.5.0",
+            "trim-right": "^1.0.1"
           }
         },
-        "is-data-descriptor": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
-          "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
+        "@babel/helper-function-name": {
+          "version": "7.0.0-beta.44",
+          "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.44.tgz",
+          "integrity": "sha512-MHRG2qZMKMFaBavX0LWpfZ2e+hLloT++N7rfM3DYOMUOGCD8cVjqZpwiL8a0bOX3IYcQev1ruciT0gdFFRTxzg==",
           "dev": true,
           "requires": {
-            "kind-of": "^6.0.0"
+            "@babel/helper-get-function-arity": "7.0.0-beta.44",
+            "@babel/template": "7.0.0-beta.44",
+            "@babel/types": "7.0.0-beta.44"
           }
         },
-        "is-descriptor": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
-          "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
+        "@babel/helper-get-function-arity": {
+          "version": "7.0.0-beta.44",
+          "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.44.tgz",
+          "integrity": "sha512-w0YjWVwrM2HwP6/H3sEgrSQdkCaxppqFeJtAnB23pRiJB5E/O9Yp7JAAeWBl+gGEgmBFinnTyOv2RN7rcSmMiw==",
           "dev": true,
           "requires": {
-            "is-accessor-descriptor": "^1.0.0",
-            "is-data-descriptor": "^1.0.0",
-            "kind-of": "^6.0.2"
+            "@babel/types": "7.0.0-beta.44"
+          }
+        },
+        "@babel/helper-split-export-declaration": {
+          "version": "7.0.0-beta.44",
+          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.44.tgz",
+          "integrity": "sha512-aQ7QowtkgKKzPGf0j6u77kBMdUFVBKNHw2p/3HX/POt5/oz8ec5cs0GwlgM8Hz7ui5EwJnzyfRmkNF1Nx1N7aA==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "7.0.0-beta.44"
+          }
+        },
+        "@babel/highlight": {
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+    "output-file-sync": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/output-file-sync/-/output-file-sync-1.1.2.tgz",
+      "integrity": "sha1-0KM+7+YaIF+suQCS6CZZjVJFznY=",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.4",
+        "mkdirp": "^0.5.1",
+        "object-assign": "^4.1.0"
+      }
+    },
     "p-finally": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
@@ -4862,6 +6656,37 @@
       "integrity": "sha512-lQe48YPsMJAig+yngZ87Lus+NF+3mtu7DVOBu6b/gHO1YpKwIj5AWjZ/TOS7i46HD/UixzWb1zeWDZfGZ3iYcg==",
       "dev": true
     },
+    "parse-glob": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/parse-glob/-/parse-glob-3.0.4.tgz",
+      "integrity": "sha1-ssN2z7EfNVE7rdFz7wu246OIORw=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "glob-base": "^0.3.0",
+        "is-dotfile": "^1.0.0",
+        "is-extglob": "^1.0.0",
+        "is-glob": "^2.0.0"
+      },
+      "dependencies": {
+        "is-extglob": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
+          "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
+          "dev": true
+        },
+        "is-glob": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
+          "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "is-extglob": "^1.0.0"
+          }
+        }
+      }
+    },
     "parse-json": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-4.0.0.tgz",
@@ -4984,6 +6809,13 @@
       "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
       "dev": true
     },
+    "preserve": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/preserve/-/preserve-0.2.0.tgz",
+      "integrity": "sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=",
+      "dev": true,
+      "optional": true
+    },
     "prettier": {
       "version": "1.13.5",
       "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.13.5.tgz",
@@ -5017,6 +6849,12 @@
         }
       }
     },
+    "private": {
+      "version": "0.1.8",
+      "resolved": "https://registry.npmjs.org/private/-/private-0.1.8.tgz",
+      "integrity": "sha512-VvivMrbvd2nKkiG38qjULzlc+4Vx4wm/whI9pQD35YrARNnhxeiRktSOhSukRLFNlzg6Br/cJPet5J/u19r/mg==",
+      "dev": true
+    },
     "process-nextick-args": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
@@ -5063,6 +6901,27 @@
       "integrity": "sha1-6eha2+ddoLvkyOBHaghikPhjtAQ=",
       "dev": true
     },
+    "randomatic": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/randomatic/-/randomatic-3.0.0.tgz",
+      "integrity": "sha512-VdxFOIEY3mNO5PtSRkkle/hPJDHvQhK21oa73K4yAc9qmp6N429gAyF1gZMOTMeS0/AYzaV/2Trcef+NaIonSA==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "is-number": "^4.0.0",
+        "kind-of": "^6.0.0",
+        "math-random": "^1.0.1"
+      },
+      "dependencies": {
+        "is-number": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+          "integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
     "readable-stream": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
@@ -5077,6 +6936,52 @@
         "util-deprecate": "~1.0.1"
       }
     },
+    "readdirp": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-2.1.0.tgz",
+      "integrity": "sha1-TtCtBg3zBzMAxIRANz9y0cxkLXg=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "graceful-fs": "^4.1.2",
+        "minimatch": "^3.0.2",
+        "readable-stream": "^2.0.2",
+        "set-immediate-shim": "^1.0.1"
+      }
+    },
+    "regenerate": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.0.tgz",
+      "integrity": "sha512-1G6jJVDWrt0rK99kBjvEtziZNCICAuvIPkSiUFIQxVP06RCVpq3dmDo2oi6ABpYaDYaTRr67BEhL8r1wgEZZKg==",
+      "dev": true
+    },
+    "regenerator-runtime": {
+      "version": "0.11.1",
+      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
+      "integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==",
+      "dev": true
+    },
+    "regenerator-transform": {
+      "version": "0.10.1",
+      "resolved": "https://registry.npmjs.org/regenerator-transform/-/regenerator-transform-0.10.1.tgz",
+      "integrity": "sha512-PJepbvDbuK1xgIgnau7Y90cwaAmO/LCLMI2mPvaXq2heGMR3aWW5/BQvYrhJ8jgmQjXewXvBjzfqKcVOmhjZ6Q==",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "^6.18.0",
+        "babel-types": "^6.19.0",
+        "private": "^0.1.6"
+      }
+    },
+    "regex-cache": {
+      "version": "0.4.4",
+      "resolved": "https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.4.tgz",
+      "integrity": "sha512-nVIZwtCjkC9YgvWkpM55B5rBhBYRZhAaJbgcFYXXsHnbZ9UZI9nnVWYZpBlCqv9ho2eZryPnWrZGsOdPwVWXWQ==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "is-equal-shallow": "^0.1.3"
+      }
+    },
     "regex-not": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/regex-not/-/regex-not-1.0.2.tgz",
@@ -5093,6 +6998,46 @@
       "integrity": "sha512-LOPw8FpgdQF9etWMaAfG/WRthIdXJGYp4mJ2Jgn/2lpkbod9jPn0t9UqN7AxBOKNfzRbYyVfgc7Vk4t/MpnXgw==",
       "dev": true
     },
+    "regexpu-core": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/regexpu-core/-/regexpu-core-2.0.0.tgz",
+      "integrity": "sha1-SdA4g3uNz4v6W5pCE5k45uoq4kA=",
+      "dev": true,
+      "requires": {
+        "regenerate": "^1.2.1",
+        "regjsgen": "^0.2.0",
+        "regjsparser": "^0.1.4"
+      }
+    },
+    "regjsgen": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/regjsgen/-/regjsgen-0.2.0.tgz",
+      "integrity": "sha1-bAFq3qxVT3WCP+N6wFuS1aTtsfc=",
+      "dev": true
+    },
+    "regjsparser": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/regjsparser/-/regjsparser-0.1.5.tgz",
+      "integrity": "sha1-fuj4Tcb6eS0/0K4ijSS9lJ6tIFw=",
+      "dev": true,
+      "requires": {
+        "jsesc": "~0.5.0"
+      },
+      "dependencies": {
+        "jsesc": {
+          "version": "0.5.0",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
+          "integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=",
+          "dev": true
+        }
+      }
+    },
+    "remove-trailing-separator": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
+      "integrity": "sha1-wkvOKig62tW8P1jg1IJJuSN52O8=",
+      "dev": true
+    },
     "repeat-element": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/repeat-element/-/repeat-element-1.1.2.tgz",
@@ -5257,6 +7202,13 @@
       "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w=",
       "dev": true
     },
+    "set-immediate-shim": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz",
+      "integrity": "sha1-SysbJ+uAip+NzEgaWOXlb1mfP2E=",
+      "dev": true,
+      "optional": true
+    },
     "set-value": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.0.tgz",
@@ -5333,6 +7285,12 @@
         }
       }
     },
+    "slash": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/slash/-/slash-1.0.0.tgz",
+      "integrity": "sha1-xB8vbDn8FtHNF61LXYlhFK5HDVU=",
+      "dev": true
+    },
     "slice-ansi": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-1.0.0.tgz",
@@ -5468,6 +7426,15 @@
         "urix": "^0.1.0"
       }
     },
+    "source-map-support": {
+      "version": "0.4.18",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
+      "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
+      "dev": true,
+      "requires": {
+        "source-map": "^0.5.6"
+      }
+    },
     "source-map-url": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/source-map-url/-/source-map-url-0.4.0.tgz",
@@ -5823,12 +7790,27 @@
         "kind-of": "^6.0.2"
       }
     },
+    "user-home": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
+      "integrity": "sha1-K1viOjK2Onyd640PKNSFcko98ZA=",
+      "dev": true
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "http://agora.dequecloud.com/artifactory/api/npm/attest-virtual/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "v8flags": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-2.1.1.tgz",
+      "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
+      "dev": true,
+      "requires": {
+        "user-home": "^1.1.1"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
diff --git a/package.json b/package.json
index 7537d72..e96ffb3 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "description": "Provides a method to inject and analyze web pages using aXe",
   "version": "2.0.0",
   "license": "MPL-2.0",
-  "main": "lib/index.js",
+  "main": "dist/index.js",
   "contributors": [
     {
       "name": "Dylan Barrell",
@@ -42,15 +42,20 @@
     "webdriver",
     "webdriverjs"
   ],
+  "engines": {
+    "node": ">=4"
+  },
   "scripts": {
     "lint": "eslint './lib/**/*.js' './test/**/*.js'",
     "fmt": "prettier --write './lib/**/*.js' './test/**/*.js'",
     "precommit": "lint-staged",
     "test": "npm run test:unit && npm run test:integration",
-    "test:unit": "mocha test/unit/*.js",
-    "test:integration": "mocha test/integration/*.js",
-    "test:sauce": "mocha test/sauce/*.js",
-    "coverage": "nyc npm run test:unit"
+    "test:unit": "mocha test/unit/*.js --require babel-register",
+    "test:integration": "mocha test/integration/*.js --require babel-register",
+    "test:sauce": "mocha test/sauce/*.js --require babel-register",
+    "coverage": "nyc npm run test:unit",
+    "build": "babel lib --out-dir dist",
+    "prepublishOnly": "npm run build"
   },
   "lint-staged": {
     "*.js": [
@@ -63,6 +68,12 @@
     "selenium-webdriver": ">= 2.53.1"
   },
   "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-core": "^6.26.3",
+    "babel-eslint": "^8.2.3",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-env": "^1.7.0",
+    "babel-register": "^6.26.0",
     "chai": "^4.1.2",
     "eslint": "^4.19.1",
     "eslint-config-prettier": "^2.9.0",
@@ -77,7 +88,8 @@
     "sinon": "^6.0.0"
   },
   "dependencies": {
-    "axe-core": "^3.0.0"
+    "axe-core": "^3.0.0",
+    "babel-runtime": "^6.26.0"
   },
   "prettier": {
     "semi": true,
@@ -89,6 +101,7 @@
     "arrowParens": "avoid"
   },
   "eslintConfig": {
+    "parser": "babel-eslint",
     "extends": [
       "eslint:recommended",
       "prettier"
diff --git a/test/unit/axe-injector.js b/test/unit/axe-injector.js
new file mode 100644
index 0000000..d232478
--- /dev/null
+++ b/test/unit/axe-injector.js
@@ -0,0 +1,204 @@
+const { assert } = require('chai');
+const sinon = require('sinon');
+const AxeInjector = require('../../lib/axe-injector');
+
+class MockWebDriver {
+  constructor(methods) {
+    if (methods) {
+      for (const name of Object.keys(methods)) {
+        this[name] = methods[name];
+      }
+    }
+  }
+
+  switchTo() {
+    return {
+      frame: () => Promise.resolve(),
+      defaultContent: () => Promise.resolve()
+    };
+  }
+
+  executeScript() {
+    return Promise.resolve();
+  }
+
+  findElements() {
+    return Promise.resolve([]);
+  }
+}
+
+describe('AxeInjector', () => {
+  it('accepts custom axe-core source', () => {
+    const axeSource = 'alert("Hello world!")';
+    const injector = new AxeInjector({
+      driver: new MockWebDriver(),
+      axeSource
+    });
+    assert.equal(injector.axeSource, axeSource);
+  });
+
+  it('accepts custom axe config', () => {
+    const injector = new AxeInjector({
+      driver: new MockWebDriver(),
+      config: { foo: 'bar' }
+    });
+    assert.equal(injector.config, '{"foo":"bar"}');
+  });
+
+  describe('errorHandler', () => {
+    it('only logs once', () => {
+      const injector = new AxeInjector({ driver: new MockWebDriver() });
+      const spy = sinon.spy(console, 'log');
+
+      injector.errorHandler();
+      injector.errorHandler();
+
+      assert.equal(spy.callCount, 1);
+
+      spy.restore();
+    });
+  });
+
+  describe('script', () => {
+    it('includes axe', () => {
+      const injector = new AxeInjector({
+        driver: new MockWebDriver(),
+        axeSource: 'axesource!'
+      });
+      const script = injector.script;
+      assert(script.includes('axesource!'));
+    });
+
+    it('includes config', () => {
+      const injector = new AxeInjector({
+        driver: new MockWebDriver(),
+        config: { foo: 'bar' }
+      });
+      const script = injector.script;
+      assert(script.includes('axe.configure({"foo":"bar"})'));
+    });
+
+    it('includes branding', () => {
+      const injector = new AxeInjector({
+        driver: new MockWebDriver()
+      });
+      const script = injector.script;
+      assert(script.includes('webdriverjs'));
+    });
+  });
+
+  describe('handleFrame', () => {
+    it('switches to the frame', async () => {
+      let switched = false;
+
+      const injector = new AxeInjector({
+        driver: new MockWebDriver({
+          switchTo() {
+            return {
+              frame(frame) {
+                assert.equal(frame, 1);
+                switched = true;
+              }
+            };
+          }
+        })
+      });
+      await injector.handleFrame(1);
+      assert(switched);
+    });
+
+    it('injects into the frame', async () => {
+      const driver = new MockWebDriver();
+      const executeScript = sinon.spy(driver, 'executeScript');
+      const injector = new AxeInjector({ driver });
+      await injector.handleFrame(1);
+      assert(executeScript.calledOnce);
+    });
+
+    it('injects into all child frames', async () => {
+      let didReturnIframes = false;
+      const driver = new MockWebDriver({
+        findElements(selector) {
+          assert.equal(selector.tagName, 'iframe');
+          if (didReturnIframes) {
+            return;
+          }
+          didReturnIframes = true;
+          return [1, 2, 3, 4];
+        }
+      });
+
+      const injector = new AxeInjector({ driver });
+      const executeScript = sinon.spy(driver, 'executeScript');
+      await injector.handleFrame(1);
+      // once for the top-frame and 4 more for the other frames
+      assert.equal(executeScript.callCount, 5);
+    });
+  });
+
+  describe('injectIntoAllFrames', () => {
+    it('switches to the top frame', async () => {
+      let calls = 0;
+      const driver = new MockWebDriver({
+        switchTo() {
+          return {
+            defaultContent() {
+              calls++;
+            }
+          };
+        }
+      });
+      const injector = new AxeInjector({ driver });
+      await injector.injectIntoAllFrames();
+      assert.equal(calls, 2);
+    });
+
+    it('injects axe into the top frame', async () => {
+      const driver = new MockWebDriver();
+      const executeScript = sinon.spy(driver, 'executeScript');
+      const injector = new AxeInjector({ driver });
+      await injector.injectIntoAllFrames();
+      assert(executeScript.calledOnce);
+    });
+
+    it('injects axe into all child frames', async () => {
+      let didReturnIframes = false;
+      const driver = new MockWebDriver({
+        findElements(selector) {
+          assert.equal(selector.tagName, 'iframe');
+          if (didReturnIframes) {
+            return;
+          }
+          didReturnIframes = true;
+          return [1, 2, 3, 4];
+        }
+      });
+
+      const injector = new AxeInjector({ driver });
+      const executeScript = sinon.spy(driver, 'executeScript');
+      await injector.injectIntoAllFrames();
+      // once for the top-frame and 4 more for the other frames
+      assert.equal(executeScript.callCount, 5);
+    });
+  });
+
+  describe('inject', () => {
+    it('injects into all frames', done => {
+      const injector = new AxeInjector({ driver: new MockWebDriver() });
+      const spy = sinon.spy(injector, 'injectIntoAllFrames');
+      injector.inject(() => {
+        assert(spy.calledOnce);
+        done();
+      });
+    });
+
+    it('ignores errors', done => {
+      const injector = new AxeInjector({ driver: new MockWebDriver() });
+      const stub = sinon.stub(injector, 'injectIntoAllFrames');
+
+      stub.rejects(new Error('oh no!'));
+
+      injector.inject(done);
+    });
+  });
+});
diff --git a/test/unit/index.js b/test/unit/index.js
index bec122c..2d803fc 100644
--- a/test/unit/index.js
+++ b/test/unit/index.js
@@ -1,7 +1,7 @@
 var assert = require('chai').assert;
 var proxyquire = require('proxyquire');
-
 var Builder = require('../../lib/index');
+
 describe('Builder', function() {
   describe('constructor', function() {
     it('should assign driver to this._driver', function() {
@@ -137,8 +137,8 @@ describe('Builder', function() {
         }
       };
       var Builder = proxyquire('../../lib/index', {
-        './inject': function(driver, source, config, cb) {
-          cb(null, 'source-code');
+        './axe-injector': function() {
+          return { inject: cb => cb(null, 'source-code') };
         }
       });
 
@@ -178,8 +178,8 @@ describe('Builder', function() {
     it('should normalize context', function(done) {
       var normalized = false;
       var Builder = proxyquire('../../lib/index', {
-        './inject': function(driver, source, config, cb) {
-          cb(null, 'source-code');
+        './axe-injector': function() {
+          return { inject: cb => cb(null, 'source-code') };
         },
         './normalize-context': function(include, exclude) {
           normalized = true;
@@ -210,20 +210,23 @@ describe('Builder', function() {
     it('should inject into the page under test', function() {
       var called = false;
       var Builder = proxyquire('../../lib/index', {
-        './inject': function(driver, source, config, cb) {
-          assert.equal(driver, 'driver');
-          assert.isFunction(cb);
-          called = true;
+        './axe-injector': function() {
+          return {
+            inject(cb) {
+              called = true;
+              cb(null, 'source-code');
+            }
+          };
         }
       });
-      new Builder('driver').analyze();
+      new Builder({ executeAsyncScript: () => Promise.resolve() }).analyze();
       assert.isTrue(called);
     });
 
     it('should call axe.run with given parameters', function(done) {
       var Builder = proxyquire('../../lib/index', {
-        './inject': function(driver, source, config, cb) {
-          cb(null, 'source-code');
+        './axe-injector': function() {
+          return { inject: cb => cb(null, 'source-code') };
         },
         './normalize-context': function() {
           return 'normalized';
@@ -251,8 +254,8 @@ describe('Builder', function() {
 
     it('should pass results to .then() instead of a callback', function(done) {
       var Builder = proxyquire('../../lib/index', {
-        './inject': function(driver, source, config, cb) {
-          cb(null, 'source-code');
+        './axe-injector': function() {
+          return { inject: cb => cb(null, 'source-code') };
         }
       });
 
@@ -274,8 +277,8 @@ describe('Builder', function() {
 
     it('should execute callback before .then()', function(done) {
       var Builder = proxyquire('../../lib/index', {
-        './inject': function(driver, source, config, cb) {
-          cb(null, 'source-code');
+        './axe-injector': function() {
+          return { inject: cb => cb(null, 'source-code') };
         }
       });
       var called = false;
diff --git a/test/unit/inject.js b/test/unit/inject.js
deleted file mode 100644
index d1f7f4d..0000000
--- a/test/unit/inject.js
+++ /dev/null
@@ -1,17 +0,0 @@
-var assert = require('chai').assert,
-  sinon = require('sinon');
-
-var Builder = require('../../lib/index');
-
-var sourceString = '/*! aXe v */\naxe.configure({"data":"something"});';
-
-describe('Attest', function() {
-  it('should assign optional source to this._source', function() {
-    var driver = sinon.stub();
-    assert.match(
-      new Builder(driver, sourceString)._source,
-      /\/\*! aXe/,
-      'regexp matches'
-    );
-  });
-});