Removed dependency on fbjs (react-navigation#1698)

Author: gabrielbull

package.json

@@ -76,7 +76,6 @@
   },
   "dependencies": {
     "clamp": "^1.0.1",
-    "fbjs": "^0.8.12",
     "hoist-non-react-statics": "^1.2.0",
     "path-to-regexp": "^1.7.0",
     "prop-types": "^15.5.10",

src/StateUtils.js

@@ -1,6 +1,6 @@
 /* @flow */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from './utils/invariant';
 
 import type { NavigationRoute, NavigationState } from './TypeDefinition';
 

src/createNavigationContainer.js

@@ -1,7 +1,7 @@
 /* @flow */
 
 import React from 'react';
-import invariant from 'fbjs/lib/invariant';
+import invariant from './utils/invariant';
 import { BackAndroid, Linking } from './PlatformHelpers';
 import NavigationActions from './NavigationActions';
 import addNavigationHelpers from './addNavigationHelpers';

src/routers/TabRouter.js

@@ -1,6 +1,6 @@
 /* @flow */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 import getScreenForRouteName from './getScreenForRouteName';
 import createConfigGetter from './createConfigGetter';
 

src/routers/createConfigGetter.js

@@ -2,7 +2,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 import getScreenForRouteName from './getScreenForRouteName';
 import addNavigationHelpers from '../addNavigationHelpers';

src/routers/getScreenConfigDeprecated.js

@@ -1,7 +1,7 @@
 /*
  * @flow
  */
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 export default () =>
   invariant(

src/routers/getScreenForRouteName.js

@@ -1,6 +1,6 @@
 /* @flow */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 import type {
   NavigationComponent,

src/routers/validateRouteConfigMap.js

@@ -1,6 +1,6 @@
 /** @flow */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 import type { NavigationRouteConfigMap } from '../TypeDefinition';
 

src/routers/validateScreenOptions.js

@@ -1,5 +1,5 @@
 /* @flow */
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 import type { NavigationRoute } from '../TypeDefinition';
 

src/utils/invariant.js

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule invariant
+ */
+
+'use strict';
+
+/**
+ * Use invariant() to assert state which your program assumes to be true.
+ *
+ * Provide sprintf-style format (only %s is supported) and arguments
+ * to provide information about what broke and what you were
+ * expecting.
+ *
+ * The invariant message will be stripped in production, but the invariant
+ * will remain to ensure logic does not differ in production.
+ */
+
+var validateFormat = function(format) {};
+
+if (__DEV__) {
+  validateFormat = function(format) {
+    if (format === undefined) {
+      throw new Error('invariant requires an error message argument');
+    }
+  };
+}
+
+function invariant(condition, format, a, b, c, d, e, f) {
+  validateFormat(format);
+
+  if (!condition) {
+    var error;
+    if (format === undefined) {
+      error = new Error(
+        'Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.'
+      );
+    } else {
+      var args = [a, b, c, d, e, f];
+      var argIndex = 0;
+      error = new Error(
+        format.replace(/%s/g, function() {
+          return args[argIndex++];
+        })
+      );
+      error.name = 'Invariant Violation';
+    }
+
+    error.framesToPop = 1; // we don't care about invariant's own frame
+    throw error;
+  }
+}
+
+module.exports = invariant;

src/utils/shallowEqual.js

@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule shallowEqual
+ * @typechecks
+ * @flow
+ */
+
+/*eslint-disable no-self-compare */
+
+'use strict';
+
+const hasOwnProperty = Object.prototype.hasOwnProperty;
+
+/**
+ * inlined Object.is polyfill to avoid requiring consumers ship their own
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
+ */
+function is(x: mixed, y: mixed): boolean {
+  // SameValue algorithm
+  if (x === y) {
+    // Steps 1-5, 7-10
+    // Steps 6.b-6.e: +0 != -0
+    // Added the nonzero y check to make Flow happy, but it is redundant
+    return x !== 0 || y !== 0 || 1 / x === 1 / y;
+  } else {
+    // Step 6.a: NaN == NaN
+    return x !== x && y !== y;
+  }
+}
+
+/**
+ * Performs equality by iterating through keys on an object and returning false
+ * when any key has values which are not strictly equal between the arguments.
+ * Returns true when the values of all keys are strictly equal.
+ */
+function shallowEqual(objA: mixed, objB: mixed): boolean {
+  if (is(objA, objB)) {
+    return true;
+  }
+  if (
+    typeof objA !== 'object' ||
+    objA === null ||
+    typeof objB !== 'object' ||
+    objB === null
+  ) {
+    return false;
+  }
+
+  const keysA = Object.keys(objA);
+  const keysB = Object.keys(objB);
+
+  if (keysA.length !== keysB.length) {
+    return false;
+  }
+
+  // Test for A's keys different from B.
+  for (let i = 0; i < keysA.length; i++) {
+    if (
+      !hasOwnProperty.call(objB, keysA[i]) ||
+      !is(objA[keysA[i]], objB[keysA[i]])
+    ) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+module.exports = shallowEqual;

src/views/PointerEventsContainer.js

@@ -2,7 +2,7 @@
 
 import React from 'react';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 import AnimatedValueSubscription from './AnimatedValueSubscription';
 

src/views/ScenesReducer.js

@@ -1,7 +1,7 @@
 /* @flow */
 
-import invariant from 'fbjs/lib/invariant';
-import shallowEqual from 'fbjs/lib/shallowEqual';
+import invariant from '../utils/invariant';
+import shallowEqual from '../utils/shallowEqual';
 
 import type {
   NavigationRoute,

src/views/Transitioner.js

@@ -4,7 +4,7 @@ import React from 'react';
 
 import { Animated, StyleSheet, View } from 'react-native';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from '../utils/invariant';
 
 import NavigationScenesReducer from './ScenesReducer';
 import TransitionConfigs from './TransitionConfigs';