From 5619d7f100c8b039f329f41303ea273956c9c170 Mon Sep 17 00:00:00 2001
From: Ives van Hoorne <ives@fb.com>
Date: Sun, 12 Aug 2018 12:46:04 +0100
Subject: [PATCH] Optimize packages by inlining variables and constant folding

---
 functions/packager/index.ts                   |  18 +-
 functions/packager/packages/find-requires.ts  |   8 +-
 .../packages/utils/extract-requires.test.ts   |  20 +
 .../packages/utils/extract-requires.ts        |  71 +---
 functions/packager/packages/utils/get-deps.ts |  59 +++
 package.json                                  |   6 +
 yarn.lock                                     | 343 +++++++++++++++++-
 7 files changed, 451 insertions(+), 74 deletions(-)
 create mode 100644 functions/packager/packages/utils/get-deps.ts

diff --git a/functions/packager/index.ts b/functions/packager/index.ts
index 1a225e4..0cc82e6 100644
--- a/functions/packager/index.ts
+++ b/functions/packager/index.ts
@@ -65,15 +65,15 @@ async function getContents(
     {},
   );
 
-  // Hardcoded deletion of some modules that are not used but added by accident
-  deleteHardcodedRequires(
-    contents,
-    "/node_modules/react/cjs/react.production.min.js",
-  );
-  deleteHardcodedRequires(
-    contents,
-    "/node_modules/react-dom/cjs/react-dom.production.min.js",
-  );
+  // // Hardcoded deletion of some modules that are not used but added by accident
+  // deleteHardcodedRequires(
+  //   contents,
+  //   "/node_modules/react/cjs/react.production.min.js",
+  // );
+  // deleteHardcodedRequires(
+  //   contents,
+  //   "/node_modules/react-dom/cjs/react-dom.production.min.js",
+  // );
 
   return { ...contents, ...packageJSONFiles };
 }
diff --git a/functions/packager/packages/find-requires.ts b/functions/packager/packages/find-requires.ts
index 283f68e..6f608eb 100644
--- a/functions/packager/packages/find-requires.ts
+++ b/functions/packager/packages/find-requires.ts
@@ -1,5 +1,5 @@
 import { fs } from "mz";
-import { dirname, join } from "path";
+import { join } from "path";
 
 import { IPackage } from "./find-package-infos";
 import resolveRequiredFiles from "./resolve-required-files";
@@ -21,9 +21,6 @@ export interface IFileData {
 }
 
 function rewritePath(path: string, currentPath: string, packagePath: string) {
-  const relativePath = nodeResolvePath(join(dirname(currentPath), path));
-  const isDependency = /^(\w|@\w)/.test(path);
-
   return browserResolve.sync(path, { filename: currentPath });
 }
 
@@ -50,6 +47,7 @@ function buildRequireObject(
   try {
     extractedRequires = extractRequires(fileData.content);
   } catch (e) {
+    console.error(e);
     return existingContents;
   }
 
@@ -60,7 +58,7 @@ function buildRequireObject(
     try {
       newPath = rewritePath(requirePath, filePath, packagePath);
     } catch (e) {
-      console.warn(`Couldn't find ${requirePath}`);
+      // console.warn(`Couldn't find ${requirePath}`);
       return;
     }
 
diff --git a/functions/packager/packages/utils/extract-requires.test.ts b/functions/packager/packages/utils/extract-requires.test.ts
index 3a7c083..ecc7113 100644
--- a/functions/packager/packages/utils/extract-requires.test.ts
+++ b/functions/packager/packages/utils/extract-requires.test.ts
@@ -17,6 +17,18 @@ describe("extractRequires", () => {
     expect(extractRequires(code)).toEqual(["react"]);
   });
 
+  it("can eliminate requires statements", () => {
+    const code = `
+    if (process.env.NODE_ENV === 'development') {
+      module.exports = require('react');
+    } else {
+      module.exports = require('blaat');
+    }
+    `;
+
+    expect(extractRequires(code)).toEqual(["react"]);
+  });
+
   it("can find dynamic require statements", () => {
     const code = `
     const react = import('react');
@@ -51,4 +63,12 @@ describe("extractRequires", () => {
 
     expect(extractRequires(code)).toEqual(["react-dom"]);
   });
+
+  it("can find re-exports", () => {
+    const code = `
+      export react from './react';
+    `;
+
+    expect(extractRequires(code)).toEqual(["./react"]);
+  });
 });
diff --git a/functions/packager/packages/utils/extract-requires.ts b/functions/packager/packages/utils/extract-requires.ts
index 966ae99..8ce1e54 100644
--- a/functions/packager/packages/utils/extract-requires.ts
+++ b/functions/packager/packages/utils/extract-requires.ts
@@ -1,12 +1,7 @@
 import * as acorn from "acorn";
-import {
-  CallExpression,
-  ImportDeclaration,
-  Literal,
-  MemberExpression,
-} from "estree";
-/* tslint:disable */
-const walk = require("acorn/dist/walk");
+import { CallExpression, ImportDeclaration, Literal } from "estree";
+import * as Babel from "babel-core";
+import { babylonAstDependencies } from "./get-deps";
 
 require("acorn-dynamic-import/lib/inject").default(acorn);
 /* tslint:enable */
@@ -33,56 +28,24 @@ type NewCallExpression = CallExpression & {
 };
 
 export default function exportRequires(code: string) {
-  const ast = acorn.parse(code, {
-    ecmaVersion: ECMA_VERSION,
-    locations: true,
-    plugins: {
-      dynamicImport: true,
-    },
-    ranges: true,
-    sourceType: "module",
+  const plugins: any = [
+    "transform-node-env-inline",
+    "minify-dead-code-elimination",
+  ];
+  const presets = ["stage-0"];
+
+  process.env.NODE_ENV = "development";
+  let { ast } = Babel.transform(code, {
+    plugins,
+    presets,
   });
+  process.env.NODE_ENV = "production";
 
   const requires: string[] = [];
 
-  walk.simple(
-    ast,
-    {
-      ImportDeclaration(node: ImportDeclaration) {
-        if (typeof node.source.value === "string") {
-          requires.push(node.source.value);
-        }
-      },
-      CallExpression(node: NewCallExpression) {
-        if (
-          /* require() */ (node.callee.type === "Identifier" &&
-            node.callee.name === "require") ||
-          node.callee.type === "Import" ||
-          /* require.resolve */ (node.callee.type === "MemberExpression" &&
-            node.callee.object.name &&
-            node.callee.object.name === "require" &&
-            node.callee.property.name &&
-            node.callee.property.name === "resolve")
-        ) {
-          if (
-            node.arguments.length === 1 &&
-            node.arguments[0].type === "Literal"
-          ) {
-            const literalArgument = node.arguments[0] as Literal;
-            if (typeof literalArgument.value === "string") {
-              requires.push(literalArgument.value);
-            }
-          }
-        }
-      },
-    },
-    {
-      ...walk.base,
-      Import(node: any, st: any, c: any) {
-        // Do nothing
-      },
-    },
-  );
+  const deps = babylonAstDependencies(ast);
+
+  deps.forEach((dep: any) => requires.push(dep.source));
 
   return requires;
 }
diff --git a/functions/packager/packages/utils/get-deps.ts b/functions/packager/packages/utils/get-deps.ts
new file mode 100644
index 0000000..8dec8c6
--- /dev/null
+++ b/functions/packager/packages/utils/get-deps.ts
@@ -0,0 +1,59 @@
+import traverse from "babel-traverse";
+import * as types from "babel-types";
+
+export function babylonAstDependencies(ast: any) {
+  const dependencies: any[] = [];
+
+  function addDependency(source: any) {
+    // Ensure that dependencies are only identified once
+    if (!dependencies.some(dep => dep.source === source)) {
+      dependencies.push({ source });
+    }
+  }
+
+  traverse(ast, {
+    // `import ... from '...';
+    ImportDeclaration(node: any) {
+      addDependency(node.node.source.value);
+    },
+    // `export ... from '...';
+    ExportDeclaration(node: any) {
+      if (node.node.source) {
+        addDependency(node.node.source.value);
+      }
+    },
+    // `require('...');
+    CallExpression(node: any) {
+      const callNode = node.node;
+      if (
+        callNode.callee.name === "require" ||
+        callNode.callee.type === "Import"
+      ) {
+        const arg = callNode.arguments[0];
+        if (types.isLiteral(arg)) {
+          const anyArg: any = arg;
+          addDependency(anyArg.value);
+        } else {
+          if (!arg.loc || !arg.loc.start) {
+            throw new Error("Require expression cannot be statically analyzed");
+          }
+
+          const err: any = new Error(
+            `Require expression at line ${arg.loc.start.line}, column ${
+              arg.loc.start.column
+            } cannot be statically analyzed`,
+          );
+
+          err.loc = {
+            line: arg.loc.start.line,
+            column: arg.loc.start.column,
+          };
+
+          throw err;
+        }
+      }
+    },
+  });
+
+  return dependencies;
+}
diff --git a/package.json b/package.json
index 0568ca1..c233547 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,11 @@
     "acorn": "^5.1.2",
     "acorn-dynamic-import": "^2.0.2",
     "aws-lambda": "^0.1.2",
+    "babel-core": "^6.26.3",
+    "babel-plugin-minify-dead-code-elimination": "^0.4.3",
+    "babel-plugin-transform-node-env-inline": "^0.4.3",
+    "babel-preset-stage-0": "^6.24.1",
+    "babylon-ast-dependencies": "^1.0.2",
     "browser-resolve": "^1.11.2",
     "json5": "^1.0.1",
     "lambda-git": "^0.1.1",
@@ -33,6 +38,7 @@
   "devDependencies": {
     "@types/acorn": "^4.0.2",
     "@types/aws-lambda": "^0.0.16",
+    "@types/babel-core": "^6.25.5",
     "@types/browser-resolve": "^0.0.5",
     "@types/express": "^4.0.37",
     "@types/jest": "^21.1.1",
diff --git a/yarn.lock b/yarn.lock
index 181d1ea..3326d57 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12,6 +12,45 @@
   version "0.0.16"
   resolved "https://registry.yarnpkg.com/@types/aws-lambda/-/aws-lambda-0.0.16.tgz#12dd6936d0f1e1c0ef6fc2fbd2d0a461889d7f56"
 
+"@types/babel-core@^6.25.5":
+  version "6.25.5"
+  resolved "https://registry.yarnpkg.com/@types/babel-core/-/babel-core-6.25.5.tgz#7598b1287c2cb5a8e9150d60e4d4a8f2dbe29982"
+  dependencies:
+    "@types/babel-generator" "*"
+    "@types/babel-template" "*"
+    "@types/babel-traverse" "*"
+    "@types/babel-types" "*"
+    "@types/babylon" "*"
+
+"@types/babel-generator@*":
+  version "6.25.2"
+  resolved "https://registry.yarnpkg.com/@types/babel-generator/-/babel-generator-6.25.2.tgz#fa13653ec2d34a4037be9c34dec32ae75bea04cc"
+  dependencies:
+    "@types/babel-types" "*"
+
+"@types/babel-template@*":
+  version "6.25.1"
+  resolved "https://registry.yarnpkg.com/@types/babel-template/-/babel-template-6.25.1.tgz#03e23a893c16bab2ec00200ab51feccf488cae78"
+  dependencies:
+    "@types/babel-types" "*"
+    "@types/babylon" "*"
+
+"@types/babel-traverse@*":
+  version "6.25.4"
+  resolved "https://registry.yarnpkg.com/@types/babel-traverse/-/babel-traverse-6.25.4.tgz#269af6a25c80419b635c8fa29ae42b0d5ce2418c"
+  dependencies:
+    "@types/babel-types" "*"
+
+"@types/babel-types@*":
+  version "7.0.4"
+  resolved "https://registry.yarnpkg.com/@types/babel-types/-/babel-types-7.0.4.tgz#bfd5b0d0d1ba13e351dff65b6e52783b816826c8"
+
+"@types/babylon@*":
+  version "6.16.3"
+  resolved "https://registry.yarnpkg.com/@types/babylon/-/babylon-6.16.3.tgz#c2937813a89fcb5e79a00062fc4a8b143e7237bb"
+  dependencies:
+    "@types/babel-types" "*"
+
 "@types/browser-resolve@^0.0.5":
   version "0.0.5"
   resolved "https://registry.yarnpkg.com/@types/browser-resolve/-/browser-resolve-0.0.5.tgz#4d7ea4babcbfa45752a5cdc016c0a0fc4dc4de7d"
@@ -416,6 +455,30 @@ babel-core@^6.0.0, babel-core@^6.24.1, babel-core@^6.26.0:
     slash "^1.0.0"
     source-map "^0.5.6"
 
+babel-core@^6.26.3:
+  version "6.26.3"
+  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.26.3.tgz#b2e2f09e342d0f0c88e2f02e067794125e75c207"
+  dependencies:
+    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"
+
 babel-generator@^6.18.0, babel-generator@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.26.0.tgz#ac1ae20070b79f6e3ca1d3269613053774f20dc5"
@@ -429,6 +492,78 @@ babel-generator@^6.18.0, babel-generator@^6.26.0:
     source-map "^0.5.6"
     trim-right "^1.0.1"
 
+babel-helper-bindify-decorators@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-bindify-decorators/-/babel-helper-bindify-decorators-6.24.1.tgz#14c19e5f142d7b47f19a52431e52b1ccbc40a330"
+  dependencies:
+    babel-runtime "^6.22.0"
+    babel-traverse "^6.24.1"
+    babel-types "^6.24.1"
+
+babel-helper-builder-binary-assignment-operator-visitor@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-builder-binary-assignment-operator-visitor/-/babel-helper-builder-binary-assignment-operator-visitor-6.24.1.tgz#cce4517ada356f4220bcae8a02c2b346f9a56664"
+  dependencies:
+    babel-helper-explode-assignable-expression "^6.24.1"
+    babel-runtime "^6.22.0"
+    babel-types "^6.24.1"
+
+babel-helper-evaluate-path@^0.4.3:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/babel-helper-evaluate-path/-/babel-helper-evaluate-path-0.4.3.tgz#0a89af702c06b217027fa371908dd4989d3e633f"
+
+babel-helper-explode-assignable-expression@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-explode-assignable-expression/-/babel-helper-explode-assignable-expression-6.24.1.tgz#f25b82cf7dc10433c55f70592d5746400ac22caa"
+  dependencies:
+    babel-runtime "^6.22.0"
+    babel-traverse "^6.24.1"
+    babel-types "^6.24.1"
+
+babel-helper-explode-class@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-explode-class/-/babel-helper-explode-class-6.24.1.tgz#7dc2a3910dee007056e1e31d640ced3d54eaa9eb"
+  dependencies:
+    babel-helper-bindify-decorators "^6.24.1"
+    babel-runtime "^6.22.0"
+    babel-traverse "^6.24.1"
+    babel-types "^6.24.1"
+
+babel-helper-function-name@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-function-name/-/babel-helper-function-name-6.24.1.tgz#d3475b8c03ed98242a25b48351ab18399d3580a9"
+  dependencies:
+    babel-helper-get-function-arity "^6.24.1"
+    babel-runtime "^6.22.0"
+    babel-template "^6.24.1"
+    babel-traverse "^6.24.1"
+    babel-types "^6.24.1"
+
+babel-helper-get-function-arity@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-get-function-arity/-/babel-helper-get-function-arity-6.24.1.tgz#8f7782aa93407c41d3aa50908f89b031b1b6853d"
+  dependencies:
+    babel-runtime "^6.22.0"
+    babel-types "^6.24.1"
+
+babel-helper-mark-eval-scopes@^0.4.3:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/babel-helper-mark-eval-scopes/-/babel-helper-mark-eval-scopes-0.4.3.tgz#d244a3bef9844872603ffb46e22ce8acdf551562"
+
+babel-helper-remap-async-to-generator@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-helper-remap-async-to-generator/-/babel-helper-remap-async-to-generator-6.24.1.tgz#5ec581827ad723fecdd381f1c928390676e4551b"
+  dependencies:
+    babel-helper-function-name "^6.24.1"
+    babel-runtime "^6.22.0"
+    babel-template "^6.24.1"
+    babel-traverse "^6.24.1"
+    babel-types "^6.24.1"
+
+babel-helper-remove-or-void@^0.4.3:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/babel-helper-remove-or-void/-/babel-helper-remove-or-void-0.4.3.tgz#a4f03b40077a0ffe88e45d07010dee241ff5ae60"
+
 babel-helpers@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-helpers/-/babel-helpers-6.24.1.tgz#3471de9caec388e5c850e597e58a26ddf37602b2"
@@ -461,10 +596,113 @@ babel-plugin-jest-hoist@^21.2.0:
   version "21.2.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-jest-hoist/-/babel-plugin-jest-hoist-21.2.0.tgz#2cef637259bd4b628a6cace039de5fcd14dbb006"
 
-babel-plugin-syntax-object-rest-spread@^6.13.0:
+babel-plugin-minify-dead-code-elimination@^0.4.3:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/babel-plugin-minify-dead-code-elimination/-/babel-plugin-minify-dead-code-elimination-0.4.3.tgz#73628265864f9008d0027506f58abeb3c1d02d98"
+  dependencies:
+    babel-helper-evaluate-path "^0.4.3"
+    babel-helper-mark-eval-scopes "^0.4.3"
+    babel-helper-remove-or-void "^0.4.3"
+    lodash.some "^4.6.0"
+
+babel-plugin-syntax-async-functions@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz#cad9cad1191b5ad634bf30ae0872391e0647be95"
+
+babel-plugin-syntax-async-generators@^6.5.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-async-generators/-/babel-plugin-syntax-async-generators-6.13.0.tgz#6bc963ebb16eccbae6b92b596eb7f35c342a8b9a"
+
+babel-plugin-syntax-class-constructor-call@^6.18.0:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-class-constructor-call/-/babel-plugin-syntax-class-constructor-call-6.18.0.tgz#9cb9d39fe43c8600bec8146456ddcbd4e1a76416"
+
+babel-plugin-syntax-class-properties@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-class-properties/-/babel-plugin-syntax-class-properties-6.13.0.tgz#d7eb23b79a317f8543962c505b827c7d6cac27de"
+
+babel-plugin-syntax-decorators@^6.13.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-decorators/-/babel-plugin-syntax-decorators-6.13.0.tgz#312563b4dbde3cc806cee3e416cceeaddd11ac0b"
+
+babel-plugin-syntax-do-expressions@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-do-expressions/-/babel-plugin-syntax-do-expressions-6.13.0.tgz#5747756139aa26d390d09410b03744ba07e4796d"
+
+babel-plugin-syntax-dynamic-import@^6.18.0:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-dynamic-import/-/babel-plugin-syntax-dynamic-import-6.18.0.tgz#8d6a26229c83745a9982a441051572caa179b1da"
+
+babel-plugin-syntax-exponentiation-operator@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-exponentiation-operator/-/babel-plugin-syntax-exponentiation-operator-6.13.0.tgz#9ee7e8337290da95288201a6a57f4170317830de"
+
+babel-plugin-syntax-export-extensions@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-export-extensions/-/babel-plugin-syntax-export-extensions-6.13.0.tgz#70a1484f0f9089a4e84ad44bac353c95b9b12721"
+
+babel-plugin-syntax-function-bind@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-function-bind/-/babel-plugin-syntax-function-bind-6.13.0.tgz#48c495f177bdf31a981e732f55adc0bdd2601f46"
+
+babel-plugin-syntax-object-rest-spread@^6.13.0, babel-plugin-syntax-object-rest-spread@^6.8.0:
   version "6.13.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-syntax-object-rest-spread/-/babel-plugin-syntax-object-rest-spread-6.13.0.tgz#fd6536f2bce13836ffa3a5458c4903a597bb3bf5"
 
+babel-plugin-syntax-trailing-function-commas@^6.22.0:
+  version "6.22.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-trailing-function-commas/-/babel-plugin-syntax-trailing-function-commas-6.22.0.tgz#ba0360937f8d06e40180a43fe0d5616fff532cf3"
+
+babel-plugin-transform-async-generator-functions@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-async-generator-functions/-/babel-plugin-transform-async-generator-functions-6.24.1.tgz#f058900145fd3e9907a6ddf28da59f215258a5db"
+  dependencies:
+    babel-helper-remap-async-to-generator "^6.24.1"
+    babel-plugin-syntax-async-generators "^6.5.0"
+    babel-runtime "^6.22.0"
+
+babel-plugin-transform-async-to-generator@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-async-to-generator/-/babel-plugin-transform-async-to-generator-6.24.1.tgz#6536e378aff6cb1d5517ac0e40eb3e9fc8d08761"
+  dependencies:
+    babel-helper-remap-async-to-generator "^6.24.1"
+    babel-plugin-syntax-async-functions "^6.8.0"
+    babel-runtime "^6.22.0"
+
+babel-plugin-transform-class-constructor-call@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-class-constructor-call/-/babel-plugin-transform-class-constructor-call-6.24.1.tgz#80dc285505ac067dcb8d6c65e2f6f11ab7765ef9"
+  dependencies:
+    babel-plugin-syntax-class-constructor-call "^6.18.0"
+    babel-runtime "^6.22.0"
+    babel-template "^6.24.1"
+
+babel-plugin-transform-class-properties@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-class-properties/-/babel-plugin-transform-class-properties-6.24.1.tgz#6a79763ea61d33d36f37b611aa9def81a81b46ac"
+  dependencies:
+    babel-helper-function-name "^6.24.1"
+    babel-plugin-syntax-class-properties "^6.8.0"
+    babel-runtime "^6.22.0"
+    babel-template "^6.24.1"
+
+babel-plugin-transform-decorators@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-decorators/-/babel-plugin-transform-decorators-6.24.1.tgz#788013d8f8c6b5222bdf7b344390dfd77569e24d"
+  dependencies:
+    babel-helper-explode-class "^6.24.1"
+    babel-plugin-syntax-decorators "^6.13.0"
+    babel-runtime "^6.22.0"
+    babel-template "^6.24.1"
+    babel-types "^6.24.1"
+
+babel-plugin-transform-do-expressions@^6.22.0:
+  version "6.22.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-do-expressions/-/babel-plugin-transform-do-expressions-6.22.0.tgz#28ccaf92812d949c2cd1281f690c8fdc468ae9bb"
+  dependencies:
+    babel-plugin-syntax-do-expressions "^6.8.0"
+    babel-runtime "^6.22.0"
+
 babel-plugin-transform-es2015-modules-commonjs@^6.24.1:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.26.0.tgz#0d8394029b7dc6abe1a97ef181e00758dd2e5d8a"
@@ -474,6 +712,39 @@ babel-plugin-transform-es2015-modules-commonjs@^6.24.1:
     babel-template "^6.26.0"
     babel-types "^6.26.0"
 
+babel-plugin-transform-exponentiation-operator@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-exponentiation-operator/-/babel-plugin-transform-exponentiation-operator-6.24.1.tgz#2ab0c9c7f3098fa48907772bb813fe41e8de3a0e"
+  dependencies:
+    babel-helper-builder-binary-assignment-operator-visitor "^6.24.1"
+    babel-plugin-syntax-exponentiation-operator "^6.8.0"
+    babel-runtime "^6.22.0"
+
+babel-plugin-transform-export-extensions@^6.22.0:
+  version "6.22.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-export-extensions/-/babel-plugin-transform-export-extensions-6.22.0.tgz#53738b47e75e8218589eea946cbbd39109bbe653"
+  dependencies:
+    babel-plugin-syntax-export-extensions "^6.8.0"
+    babel-runtime "^6.22.0"
+
+babel-plugin-transform-function-bind@^6.22.0:
+  version "6.22.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-function-bind/-/babel-plugin-transform-function-bind-6.22.0.tgz#c6fb8e96ac296a310b8cf8ea401462407ddf6a97"
+  dependencies:
+    babel-plugin-syntax-function-bind "^6.8.0"
+    babel-runtime "^6.22.0"
+
+babel-plugin-transform-node-env-inline@^0.4.3:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-node-env-inline/-/babel-plugin-transform-node-env-inline-0.4.3.tgz#8c84cd74d58f17b0fdf76144a3589f610c3c2497"
+
+babel-plugin-transform-object-rest-spread@^6.22.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-object-rest-spread/-/babel-plugin-transform-object-rest-spread-6.26.0.tgz#0f36692d50fef6b7e2d4b3ac1478137a963b7b06"
+  dependencies:
+    babel-plugin-syntax-object-rest-spread "^6.8.0"
+    babel-runtime "^6.26.0"
+
 babel-plugin-transform-strict-mode@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-strict-mode/-/babel-plugin-transform-strict-mode-6.24.1.tgz#d5faf7aa578a65bbe591cf5edae04a0c67020758"
@@ -488,6 +759,41 @@ babel-preset-jest@^21.0.0, babel-preset-jest@^21.2.0:
     babel-plugin-jest-hoist "^21.2.0"
     babel-plugin-syntax-object-rest-spread "^6.13.0"
 
+babel-preset-stage-0@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-preset-stage-0/-/babel-preset-stage-0-6.24.1.tgz#5642d15042f91384d7e5af8bc88b1db95b039e6a"
+  dependencies:
+    babel-plugin-transform-do-expressions "^6.22.0"
+    babel-plugin-transform-function-bind "^6.22.0"
+    babel-preset-stage-1 "^6.24.1"
+
+babel-preset-stage-1@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-preset-stage-1/-/babel-preset-stage-1-6.24.1.tgz#7692cd7dcd6849907e6ae4a0a85589cfb9e2bfb0"
+  dependencies:
+    babel-plugin-transform-class-constructor-call "^6.24.1"
+    babel-plugin-transform-export-extensions "^6.22.0"
+    babel-preset-stage-2 "^6.24.1"
+
+babel-preset-stage-2@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-preset-stage-2/-/babel-preset-stage-2-6.24.1.tgz#d9e2960fb3d71187f0e64eec62bc07767219bdc1"
+  dependencies:
+    babel-plugin-syntax-dynamic-import "^6.18.0"
+    babel-plugin-transform-class-properties "^6.24.1"
+    babel-plugin-transform-decorators "^6.24.1"
+    babel-preset-stage-3 "^6.24.1"
+
+babel-preset-stage-3@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-preset-stage-3/-/babel-preset-stage-3-6.24.1.tgz#836ada0a9e7a7fa37cb138fb9326f87934a48395"
+  dependencies:
+    babel-plugin-syntax-trailing-function-commas "^6.22.0"
+    babel-plugin-transform-async-generator-functions "^6.24.1"
+    babel-plugin-transform-async-to-generator "^6.24.1"
+    babel-plugin-transform-exponentiation-operator "^6.24.1"
+    babel-plugin-transform-object-rest-spread "^6.22.0"
+
 babel-register@^6.18.0, babel-register@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.26.0.tgz#6ed021173e2fcb486d7acb45c6009a856f647071"
@@ -517,7 +823,7 @@ babel-template@^6.16.0, babel-template@^6.24.1, babel-template@^6.26.0:
     babylon "^6.18.0"
     lodash "^4.17.4"
 
-babel-traverse@^6.18.0, babel-traverse@^6.26.0:
+babel-traverse@^6.18.0, babel-traverse@^6.24.1, babel-traverse@^6.26.0, babel-traverse@^6.5.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.26.0.tgz#46a9cbd7edcc62c8e5c064e2d2d8d0f4035766ee"
   dependencies:
@@ -531,7 +837,7 @@ babel-traverse@^6.18.0, babel-traverse@^6.26.0:
     invariant "^2.2.2"
     lodash "^4.17.4"
 
-babel-types@^6.18.0, babel-types@^6.24.1, babel-types@^6.26.0:
+babel-types@^6.18.0, babel-types@^6.24.1, babel-types@^6.26.0, babel-types@^6.5.2:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.26.0.tgz#a3b073f94ab49eb6fa55cd65227a334380632497"
   dependencies:
@@ -540,7 +846,16 @@ babel-types@^6.18.0, babel-types@^6.24.1, babel-types@^6.26.0:
     lodash "^4.17.4"
     to-fast-properties "^1.0.3"
 
-babylon@^6.18.0:
+babylon-ast-dependencies@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/babylon-ast-dependencies/-/babylon-ast-dependencies-1.0.2.tgz#5f174776128fc44d7a0dea86dbaf560324882b69"
+  dependencies:
+    babel-traverse "^6.5.0"
+    babel-types "^6.5.2"
+    babylon "^6.5.2"
+    lodash "^4.5.0"
+
+babylon@^6.18.0, babylon@^6.5.2:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
 
@@ -866,6 +1181,10 @@ convert-source-map@^1.4.0, convert-source-map@^1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.5.0.tgz#9acd70851c6d5dfdd93d9282e5edf94a03ff46b5"
 
+convert-source-map@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.5.1.tgz#b8278097b9bc229365de5c62cf5fcaed8b5599e5"
+
 cookie-signature@1.0.6:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/cookie-signature/-/cookie-signature-1.0.6.tgz#e303a882b342cc3ee8ca513a79999734dab3ae2c"
@@ -937,7 +1256,7 @@ dashdash@^1.12.0:
   dependencies:
     assert-plus "^1.0.0"
 
-debug@2, debug@2.6.9, debug@^2.2.0, debug@^2.4.1, debug@^2.6.3, debug@^2.6.8:
+debug@2, debug@2.6.9, debug@^2.2.0, debug@^2.4.1, debug@^2.6.3, debug@^2.6.8, debug@^2.6.9:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   dependencies:
@@ -2542,10 +2861,18 @@ lodash.once@^4.0.0:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/lodash.once/-/lodash.once-4.1.1.tgz#0dd3971213c7c56df880977d504c88fb471a97ac"
 
+lodash.some@^4.6.0:
+  version "4.6.0"
+  resolved "https://registry.yarnpkg.com/lodash.some/-/lodash.some-4.6.0.tgz#1bb9f314ef6b8baded13b549169b2a945eb68e4d"
+
 lodash@^4.0.0, lodash@^4.13.1, lodash@^4.14.0, lodash@^4.17.4, lodash@^4.3.0:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
 
+lodash@^4.5.0:
+  version "4.17.10"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+
 longest@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/longest/-/longest-1.0.1.tgz#30a0b2da38f73770e8294a0d22e6625ed77d0097"
@@ -3141,6 +3468,10 @@ private@^0.1.7:
   version "0.1.7"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.7.tgz#68ce5e8a1ef0a23bb570cc28537b5332aba63ef1"
 
+private@^0.1.8:
+  version "0.1.8"
+  resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
+
 process-nextick-args@~1.0.6:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"
@@ -3643,7 +3974,7 @@ source-map@^0.4.4:
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1, source-map@~0.5.6:
+source-map@^0.5.3, source-map@^0.5.6, source-map@^0.5.7, source-map@~0.5.1, source-map@~0.5.6:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"