diff --git a/experimental/babel-preset-env/.eslintrc b/experimental/babel-preset-env/.eslintrc
index 4ce4e238f6..040fcc2437 100644
--- a/experimental/babel-preset-env/.eslintrc
+++ b/experimental/babel-preset-env/.eslintrc
@@ -17,6 +17,7 @@
     "curly": ["error", "multi-line"],
     "func-call-spacing": "error",
     "key-spacing": "error",
-    "no-multi-spaces": "error"
+    "no-multi-spaces": "error",
+    "flowtype/generic-spacing": "off"
   }
 }
diff --git a/experimental/babel-preset-env/package.json b/experimental/babel-preset-env/package.json
index ee4b2127aa..e6ddaef474 100644
--- a/experimental/babel-preset-env/package.json
+++ b/experimental/babel-preset-env/package.json
@@ -79,7 +79,7 @@
     "lodash": "^4.17.4",
     "mocha": "^3.2.0",
     "nyc": "^10.1.2",
-    "prettier": "^0.22.0",
+    "prettier": "1.3.1",
     "rimraf": "^2.6.1"
   },
   "babel": {
diff --git a/experimental/babel-preset-env/scripts/build-data.js b/experimental/babel-preset-env/scripts/build-data.js
index 3d60376740..56cd0f6435 100644
--- a/experimental/babel-preset-env/scripts/build-data.js
+++ b/experimental/babel-preset-env/scripts/build-data.js
@@ -16,13 +16,10 @@ const electronToChromiumKeys = Object.keys(
   electronToChromiumVersions
 ).reverse();
 
-const chromiumToElectronMap = electronToChromiumKeys.reduce(
-  (all, electron) => {
-    all[electronToChromiumVersions[electron]] = +electron;
-    return all;
-  },
-  {}
-);
+const chromiumToElectronMap = electronToChromiumKeys.reduce((all, electron) => {
+  all[electronToChromiumVersions[electron]] = +electron;
+  return all;
+}, {});
 const chromiumToElectronVersions = Object.keys(chromiumToElectronMap);
 
 const findClosestElectronVersion = targetVersion => {
@@ -51,12 +48,11 @@ const renameTests = (tests, getName) =>
 
 const envs = require("compat-table/environments");
 
-const byTestSuite = suite =>
-  browser => {
-    return Array.isArray(browser.test_suites)
-      ? browser.test_suites.indexOf(suite) > -1
-      : true;
-  };
+const byTestSuite = suite => browser => {
+  return Array.isArray(browser.test_suites)
+    ? browser.test_suites.indexOf(suite) > -1
+    : true;
+};
 
 const es6 = require("compat-table/data-es6");
 es6.browsers = pickBy(envs, byTestSuite("es6"));
@@ -163,20 +159,24 @@ const compatibilityTests = flattenDeep(
       return test.subtests
         ? [test, renameTests(test.subtests, name => test.name + " / " + name)]
         : test;
-    }))
+    })
+  )
 );
 
 const getLowestImplementedVersion = ({ features }, env) => {
   const tests = flatten(
     compatibilityTests
       .filter(test => {
-        return features.indexOf(test.name) >= 0 ||
+        return (
+          features.indexOf(test.name) >= 0 ||
           // for features === ["DataView"]
           // it covers "DataView (Int8)" and "DataView (UInt8)"
-          (features.length === 1 && test.name.indexOf(features[0]) === 0);
+          (features.length === 1 && test.name.indexOf(features[0]) === 0)
+        );
       })
       .map(test => {
-        const isBuiltIn = test.category === "built-ins" ||
+        const isBuiltIn =
+          test.category === "built-ins" ||
           test.category === "built-in extensions";
 
         return test.subtests
diff --git a/experimental/babel-preset-env/src/debug.js b/experimental/babel-preset-env/src/debug.js
index 35e98da8b5..4149a30b22 100644
--- a/experimental/babel-preset-env/src/debug.js
+++ b/experimental/babel-preset-env/src/debug.js
@@ -14,15 +14,12 @@ export const logMessage = (message, context) => {
 
 export const logPlugin = (plugin, targets, list, context) => {
   const envList = list[plugin] || {};
-  const filteredList = Object.keys(targets).reduce(
-    (a, b) => {
-      if (!envList[b] || semver.lt(targets[b], semverify(envList[b]))) {
-        a[b] = prettifyVersion(targets[b]);
-      }
-      return a;
-    },
-    {},
-  );
+  const filteredList = Object.keys(targets).reduce((a, b) => {
+    if (!envList[b] || semver.lt(targets[b], semverify(envList[b]))) {
+      a[b] = prettifyVersion(targets[b]);
+    }
+    return a;
+  }, {});
 
   const formattedTargets = JSON.stringify(filteredList)
     .replace(/\,/g, ", ")
diff --git a/experimental/babel-preset-env/src/index.js b/experimental/babel-preset-env/src/index.js
index b68c469c5d..f9662ea770 100644
--- a/experimental/babel-preset-env/src/index.js
+++ b/experimental/babel-preset-env/src/index.js
@@ -23,29 +23,29 @@ export const isPluginRequired = (
     return true;
   }
 
-  const isRequiredForEnvironments: Array<string> = targetEnvironments.filter(
-    environment => {
-      // Feature is not implemented in that environment
-      if (!plugin[environment]) {
-        return true;
-      }
+  const isRequiredForEnvironments: Array<
+    string,
+  > = targetEnvironments.filter(environment => {
+    // Feature is not implemented in that environment
+    if (!plugin[environment]) {
+      return true;
+    }
 
-      const lowestImplementedVersion: string = plugin[environment];
-      const lowestTargetedVersion: string = supportedEnvironments[environment];
+    const lowestImplementedVersion: string = plugin[environment];
+    const lowestTargetedVersion: string = supportedEnvironments[environment];
 
-      if (!semver.valid(lowestTargetedVersion)) {
-        throw new Error(
-          // eslint-disable-next-line max-len
-          `Invalid version passed for target "${environment}": "${lowestTargetedVersion}". Versions must be in semver format (major.minor.patch)`,
-        );
-      }
-
-      return semver.gt(
-        semverify(lowestImplementedVersion),
-        lowestTargetedVersion,
+    if (!semver.valid(lowestTargetedVersion)) {
+      throw new Error(
+        // eslint-disable-next-line max-len
+        `Invalid version passed for target "${environment}": "${lowestTargetedVersion}". Versions must be in semver format (major.minor.patch)`,
       );
-    },
-  );
+    }
+
+    return semver.gt(
+      semverify(lowestImplementedVersion),
+      lowestTargetedVersion,
+    );
+  });
 
   return isRequiredForEnvironments.length > 0;
 };
@@ -172,7 +172,8 @@ export default function buildPreset(
   // NOTE: not giving spec here yet to avoid compatibility issues when
   // babel-plugin-transform-es2015-modules-commonjs gets its spec mode
   transformations.forEach(pluginName =>
-    plugins.push([require(`babel-plugin-${pluginName}`), { spec, loose }]));
+    plugins.push([require(`babel-plugin-${pluginName}`), { spec, loose }]),
+  );
 
   const regenerator = transformations.has("transform-regenerator");
 
@@ -206,7 +207,8 @@ Using polyfills with \`${useBuiltIns}\` option:`,
       regenerator,
       onDebug: (polyfills, context) => {
         polyfills.forEach(polyfill =>
-          logPlugin(polyfill, polyfillTargets, builtInsList, context));
+          logPlugin(polyfill, polyfillTargets, builtInsList, context),
+        );
       },
     };
 
diff --git a/experimental/babel-preset-env/src/targets-parser.js b/experimental/babel-preset-env/src/targets-parser.js
index d0b619b79f..73618dca99 100644
--- a/experimental/babel-preset-env/src/targets-parser.js
+++ b/experimental/babel-preset-env/src/targets-parser.js
@@ -23,30 +23,27 @@ const semverMin = (first: ?string, second: string): string => {
 };
 
 const getLowestVersions = (browsers: Array<string>): Targets => {
-  return browsers.reduce(
-    (all: Object, browser: string): Object => {
-      const [browserName, browserVersion] = browser.split(" ");
-      const normalizedBrowserName = browserNameMap[browserName];
-
-      if (!normalizedBrowserName) {
-        return all;
-      }
-
-      try {
-        // Browser version can return as "10.0-10.2"
-        const splitVersion = browserVersion.split("-")[0];
-        const parsedBrowserVersion = semverify(splitVersion);
-
-        all[normalizedBrowserName] = semverMin(
-          all[normalizedBrowserName],
-          parsedBrowserVersion,
-        );
-      } catch (e) {}
+  return browsers.reduce((all: Object, browser: string): Object => {
+    const [browserName, browserVersion] = browser.split(" ");
+    const normalizedBrowserName = browserNameMap[browserName];
 
+    if (!normalizedBrowserName) {
       return all;
-    },
-    {},
-  );
+    }
+
+    try {
+      // Browser version can return as "10.0-10.2"
+      const splitVersion = browserVersion.split("-")[0];
+      const parsedBrowserVersion = semverify(splitVersion);
+
+      all[normalizedBrowserName] = semverMin(
+        all[normalizedBrowserName],
+        parsedBrowserVersion,
+      );
+    } catch (e) {}
+
+    return all;
+  }, {});
 };
 
 const outputDecimalWarning = (decimalTargets: Array<Object>): void => {
@@ -57,7 +54,8 @@ const outputDecimalWarning = (decimalTargets: Array<Object>): void => {
   console.log("Warning, the following targets are using a decimal version:");
   console.log("");
   decimalTargets.forEach(({ target, value }) =>
-    console.log(`  ${target}: ${value}`));
+    console.log(`  ${target}: ${value}`),
+  );
   console.log("");
   console.log(
     "We recommend using a string for minor/patch versions to avoid numbers like 6.10",
diff --git a/experimental/babel-preset-env/src/use-built-ins-entry-plugin.js b/experimental/babel-preset-env/src/use-built-ins-entry-plugin.js
index 59738cf0af..fa0026a365 100644
--- a/experimental/babel-preset-env/src/use-built-ins-entry-plugin.js
+++ b/experimental/babel-preset-env/src/use-built-ins-entry-plugin.js
@@ -28,13 +28,15 @@ export default function({ types: t }: { types: Object }): Plugin {
   }
 
   function isRequire(path: Object): boolean {
-    return t.isExpressionStatement(path.node) &&
+    return (
+      t.isExpressionStatement(path.node) &&
       t.isCallExpression(path.node.expression) &&
       t.isIdentifier(path.node.expression.callee) &&
       path.node.expression.callee.name === "require" &&
       path.node.expression.arguments.length === 1 &&
       t.isStringLiteral(path.node.expression.arguments[0]) &&
-      isPolyfillSource(path.node.expression.arguments[0].value);
+      isPolyfillSource(path.node.expression.arguments[0].value)
+    );
   }
 
   function createImport(
diff --git a/experimental/babel-preset-env/src/use-built-ins-plugin.js b/experimental/babel-preset-env/src/use-built-ins-plugin.js
index 236dc4dd5d..851b2d3019 100644
--- a/experimental/babel-preset-env/src/use-built-ins-plugin.js
+++ b/experimental/babel-preset-env/src/use-built-ins-plugin.js
@@ -38,8 +38,9 @@ const modulePathMap = {
 };
 
 const getModulePath = module => {
-  return modulePathMap[module] ||
-    `babel-polyfill/lib/core-js/modules/${module}`;
+  return (
+    modulePathMap[module] || `babel-polyfill/lib/core-js/modules/${module}`
+  );
 };
 
 export default function({ types: t }: { types: Object }): Plugin {
@@ -82,13 +83,15 @@ export default function({ types: t }: { types: Object }): Plugin {
   }
 
   function isRequire(path: Object): boolean {
-    return t.isExpressionStatement(path.node) &&
+    return (
+      t.isExpressionStatement(path.node) &&
       t.isCallExpression(path.node.expression) &&
       t.isIdentifier(path.node.expression.callee) &&
       path.node.expression.callee.name === "require" &&
       path.node.expression.arguments.length === 1 &&
       t.isStringLiteral(path.node.expression.arguments[0]) &&
-      isPolyfillSource(path.node.expression.arguments[0].value);
+      isPolyfillSource(path.node.expression.arguments[0].value)
+    );
   }
 
   const addAndRemovePolyfillImports = {
diff --git a/experimental/babel-preset-env/src/utils.js b/experimental/babel-preset-env/src/utils.js
index 4a4d909f8d..67200ed98a 100644
--- a/experimental/babel-preset-env/src/utils.js
+++ b/experimental/babel-preset-env/src/utils.js
@@ -40,17 +40,14 @@ export const prettifyVersion = (version: string): string => {
 };
 
 export const prettifyTargets = (targets: Targets): Object => {
-  return Object.keys(targets).reduce(
-    (results, target) => {
-      let value = targets[target];
+  return Object.keys(targets).reduce((results, target) => {
+    let value = targets[target];
 
-      if (typeof value === "string") {
-        value = prettifyVersion(value);
-      }
+    if (typeof value === "string") {
+      value = prettifyVersion(value);
+    }
 
-      results[target] = value;
-      return results;
-    },
-    {},
-  );
+    results[target] = value;
+    return results;
+  }, {});
 };
diff --git a/experimental/babel-preset-env/test/debug-fixtures.js b/experimental/babel-preset-env/test/debug-fixtures.js
index 4f499022da..ffc67a3f46 100644
--- a/experimental/babel-preset-env/test/debug-fixtures.js
+++ b/experimental/babel-preset-env/test/debug-fixtures.js
@@ -56,8 +56,8 @@ const buildTest = opts => {
     let stdout = "";
     let stderr = "";
 
-    spawn.stdout.on("data", chunk => stdout += chunk);
-    spawn.stderr.on("data", chunk => stderr += chunk);
+    spawn.stdout.on("data", chunk => (stdout += chunk));
+    spawn.stderr.on("data", chunk => (stderr += chunk));
 
     spawn.on("close", () => {
       let err;
diff --git a/experimental/babel-preset-env/test/normalize-options.spec.js b/experimental/babel-preset-env/test/normalize-options.spec.js
index 3e330d0e88..108a28304c 100644
--- a/experimental/babel-preset-env/test/normalize-options.spec.js
+++ b/experimental/babel-preset-env/test/normalize-options.spec.js
@@ -67,24 +67,18 @@ describe("normalize-options", () => {
 
   describe("checkDuplicateIncludeExcludes", function() {
     it("should throw if duplicate names in both", function() {
-      assert.throws(
-        () => {
-          checkDuplicateIncludeExcludes(
-            ["transform-regenerator", "map"],
-            ["transform-regenerator", "map"],
-          );
-        },
-        Error,
-      );
+      assert.throws(() => {
+        checkDuplicateIncludeExcludes(
+          ["transform-regenerator", "map"],
+          ["transform-regenerator", "map"],
+        );
+      }, Error);
     });
 
     it("should not throw if no duplicate names in both", function() {
-      assert.doesNotThrow(
-        () => {
-          checkDuplicateIncludeExcludes(["transform-regenerator"], ["map"]);
-        },
-        Error,
-      );
+      assert.doesNotThrow(() => {
+        checkDuplicateIncludeExcludes(["transform-regenerator"], ["map"]);
+      }, Error);
     });
   });
 
@@ -100,12 +94,9 @@ describe("normalize-options", () => {
     });
 
     it("should not throw if no duplicate names in both", function() {
-      assert.doesNotThrow(
-        () => {
-          checkDuplicateIncludeExcludes(["transform-regenerator"], ["map"]);
-        },
-        Error,
-      );
+      assert.doesNotThrow(() => {
+        checkDuplicateIncludeExcludes(["transform-regenerator"], ["map"]);
+      }, Error);
     });
   });
 
@@ -135,21 +126,15 @@ describe("normalize-options", () => {
     });
 
     it("`true` option is invalid", () => {
-      assert.throws(
-        () => {
-          validateModulesOption(true);
-        },
-        Error,
-      );
+      assert.throws(() => {
+        validateModulesOption(true);
+      }, Error);
     });
 
     it("array option is invalid", () => {
-      assert.throws(
-        () => {
-          assert(validateModulesOption([]));
-        },
-        Error,
-      );
+      assert.throws(() => {
+        assert(validateModulesOption([]));
+      }, Error);
     });
   });
   describe("validateIncludesAndExcludes", function() {
@@ -157,12 +142,9 @@ describe("normalize-options", () => {
       assert.deepEqual(validateIncludesAndExcludes(), []);
     });
     it("should throw if not in features", function() {
-      assert.throws(
-        () => {
-          validateIncludesAndExcludes(["asdf"]);
-        },
-        Error,
-      );
+      assert.throws(() => {
+        validateIncludesAndExcludes(["asdf"]);
+      }, Error);
     });
   });
 });
diff --git a/experimental/babel-preset-env/yarn.lock b/experimental/babel-preset-env/yarn.lock
index 453ab05f28..e5b2acf992 100644
--- a/experimental/babel-preset-env/yarn.lock
+++ b/experimental/babel-preset-env/yarn.lock
@@ -178,18 +178,14 @@ assertion-error@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.0.2.tgz#13ca515d86206da0bac66e834dd397d87581094c"
 
-ast-types@0.8.18:
-  version "0.8.18"
-  resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.8.18.tgz#c8b98574898e8914e9d8de74b947564a9fe929af"
-
-ast-types@0.9.4:
-  version "0.9.4"
-  resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.9.4.tgz#410d1f81890aeb8e0a38621558ba5869ae53c91b"
-
 ast-types@0.9.6:
   version "0.9.6"
   resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.9.6.tgz#102c9e9e9005d3e7e3829bf0c4fa24ee862ee9b9"
 
+ast-types@0.9.8:
+  version "0.9.8"
+  resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.9.8.tgz#6cb6a40beba31f49f20928e28439fc14a3dab078"
+
 astquery@latest:
   version "0.0.11"
   resolved "https://registry.yarnpkg.com/astquery/-/astquery-0.0.11.tgz#1538c54d3f3a788c362942ef2bab139036fe9cdd"
@@ -1609,10 +1605,6 @@ babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.23.0, babel-types@^6.24
     lodash "^4.2.0"
     to-fast-properties "^1.0.1"
 
-babylon@6.15.0:
-  version "6.15.0"
-  resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.15.0.tgz#ba65cfa1a80e1759b0e89fb562e27dccae70348e"
-
 babylon@7.0.0-beta.4:
   version "7.0.0-beta.4"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.4.tgz#82db799d2667f61bbaf34456dbfa91c37613459d"
@@ -1879,10 +1871,6 @@ color-name@^1.1.1:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.2.tgz#5c8ab72b64bd2215d617ae9559ebb148475cf98d"
 
-colors@>=0.6.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/colors/-/colors-1.1.2.tgz#168a4701756b6a7f51a12ce0c97bfa28c084ed63"
-
 combined-stream@^1.0.5, combined-stream@~1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.5.tgz#938370a57b4a51dea2c77c15d5c5fdf895164009"
@@ -2563,13 +2551,9 @@ flow-bin@^0.46.0:
   version "0.46.0"
   resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.46.0.tgz#06ad7fe19dddb1042264438064a2a32fee12b872"
 
-flow-parser@0.40.0:
-  version "0.40.0"
-  resolved "https://registry.yarnpkg.com/flow-parser/-/flow-parser-0.40.0.tgz#b3444742189093323c4319c4fe9d35391f46bcbc"
-  dependencies:
-    ast-types "0.8.18"
-    colors ">=0.6.2"
-    minimist ">=0.2.0"
+flow-parser@0.45.0:
+  version "0.45.0"
+  resolved "https://registry.yarnpkg.com/flow-parser/-/flow-parser-0.45.0.tgz#aa29d4ae27f06aa02817772bba0fcbefef7e62f0"
 
 for-in@^1.0.1:
   version "1.0.2"
@@ -3524,7 +3508,7 @@ minimist@0.0.8, minimist@~0.0.1:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
-minimist@1.2.0, minimist@>=0.2.0, minimist@^1.2.0:
+minimist@1.2.0, minimist@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
@@ -3914,16 +3898,16 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@^0.22.0:
-  version "0.22.0"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-0.22.0.tgz#7b37c4480d0858180407e5a8e13f0f47da7385d2"
+prettier@1.3.1:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.3.1.tgz#fa0ea84b45ac0ba6de6a1e4cecdcff900d563151"
   dependencies:
-    ast-types "0.9.4"
+    ast-types "0.9.8"
     babel-code-frame "6.22.0"
-    babylon "6.15.0"
+    babylon "7.0.0-beta.8"
     chalk "1.1.3"
     esutils "2.0.2"
-    flow-parser "0.40.0"
+    flow-parser "0.45.0"
     get-stdin "5.0.1"
     glob "7.1.1"
     jest-validate "19.0.0"
@@ -4154,7 +4138,7 @@ repeating@^2.0.0:
   dependencies:
     is-finite "^1.0.0"
 
-request@2.79.0:
+request@2.79.0, request@^2.55.0:
   version "2.79.0"
   resolved "https://registry.yarnpkg.com/request/-/request-2.79.0.tgz#4dfe5bf6be8b8cdc37fcf93e04b65577722710de"
   dependencies:
@@ -4179,7 +4163,7 @@ request@2.79.0:
     tunnel-agent "~0.4.1"
     uuid "^3.0.0"
 
-request@^2.55.0, request@^2.81.0:
+request@^2.81.0:
   version "2.81.0"
   resolved "https://registry.yarnpkg.com/request/-/request-2.81.0.tgz#c6928946a0e06c5f8d6f8a9333469ffda46298a0"
   dependencies: