Use babel transform to inline all requires

Improving startup time, and avoiding unused modules in the tree

.babelrc

@@ -5,7 +5,8 @@
     "transform-es2015-destructuring",
     "transform-es2015-parameters",
     "transform-async-to-generator",
-    "transform-strict-mode"
+    "transform-strict-mode",
+    ["transform-inline-imports-commonjs", {"allowTopLevelThis": true}]
   ],
   "retainLines": true
 }

package.json

@@ -10,6 +10,7 @@
     "babel-plugin-transform-es2015-destructuring": "^6.23.0",
     "babel-plugin-transform-es2015-parameters": "^6.23.0",
     "babel-plugin-transform-flow-strip-types": "^6.18.0",
+    "babel-plugin-transform-inline-imports-commonjs": "^1.2.0",
     "babel-plugin-transform-runtime": "^6.23.0",
     "babel-plugin-transform-strict-mode": "^6.24.1",
     "babel-preset-env": "^1.4.0",

packages/jest-runtime/src/index.js

@@ -16,16 +16,15 @@ import type {Context} from 'types/Context';
 import type {ModuleMap} from 'jest-haste-map';
 import type {MockFunctionMetadata, ModuleMocker} from 'types/Mock';
 
-const path = require('path');
-const HasteMap = require('jest-haste-map');
-const Resolver = require('jest-resolve');
-
-const {createDirectory} = require('jest-util');
-const {escapePathForRegex} = require('jest-regex-util');
-const fs = require('graceful-fs');
-const stripBOM = require('strip-bom');
-const ScriptTransformer = require('./ScriptTransformer');
-const shouldInstrument = require('./shouldInstrument');
+import path from 'path';
+import HasteMap from 'jest-haste-map';
+import Resolver from 'jest-resolve';
+import {createDirectory} from 'jest-util';
+import {escapePathForRegex} from 'jest-regex-util';
+import fs from 'graceful-fs';
+import stripBOM from 'strip-bom';
+import ScriptTransformer from './ScriptTransformer';
+import shouldInstrument from './shouldInstrument';
 
 type Module = {|
   children?: Array<any>,

yarn.lock

@@ -611,6 +611,13 @@ babel-plugin-transform-flow-strip-types@^6.18.0, babel-plugin-transform-flow-str
     babel-plugin-syntax-flow "^6.18.0"
     babel-runtime "^6.22.0"
 
+babel-plugin-transform-inline-imports-commonjs@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-inline-imports-commonjs/-/babel-plugin-transform-inline-imports-commonjs-1.2.0.tgz#20c7d192bafc54c8727386e3387d8ee4ef19e6a5"
+  dependencies:
+    babel-plugin-transform-strict-mode "^6.8.0"
+    builtin-modules "^1.1.1"
+
 babel-plugin-transform-object-assign@^6.5.0:
   version "6.22.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-object-assign/-/babel-plugin-transform-object-assign-6.22.0.tgz#f99d2f66f1a0b0d498e346c5359684740caa20ba"
@@ -664,7 +671,7 @@ babel-plugin-transform-runtime@^6.23.0:
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-strict-mode@^6.24.1:
+babel-plugin-transform-strict-mode@^6.24.1, babel-plugin-transform-strict-mode@^6.8.0:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-strict-mode/-/babel-plugin-transform-strict-mode-6.24.1.tgz#d5faf7aa578a65bbe591cf5edae04a0c67020758"
   dependencies: