use own isFunction, isPlainObject´ and isSymbol checks

package.json

@@ -66,9 +66,6 @@
   },
   "dependencies": {
     "invariant": "^2.2.1",
-    "is-function": "^1.0.1",
-    "is-plain-object": "^2.0.4",
-    "is-symbol": "^1.0.1",
     "lodash.camelcase": "^4.3.0",
     "lodash.curry": "^4.1.1",
     "reduce-reducers": "^0.1.0"

src/combineActions.js

@@ -1,6 +1,6 @@
 import invariant from 'invariant';
-import isFunction from 'is-function';
-import isSymbol from 'is-symbol';
+import isFunction from './utils/isFunction';
+import isSymbol from './utils/isSymbol';
 import isEmpty from './utils/isEmpty';
 import toString from './utils/toString';
 import isString from './utils/isString';

src/createAction.js

@@ -1,5 +1,5 @@
-import isFunction from 'is-function';
 import invariant from 'invariant';
+import isFunction from './utils/isFunction';
 import identity from './utils/identity';
 import isNull from './utils/isNull';
 

src/createActions.js

@@ -1,6 +1,6 @@
-import isPlainObject from 'is-plain-object';
-import isFunction from 'is-function';
 import invariant from 'invariant';
+import isPlainObject from './utils/isPlainObject';
+import isFunction from './utils/isFunction';
 import identity from './utils/identity';
 import isArray from './utils/isArray';
 import isString from './utils/isString';

src/handleAction.js

@@ -1,6 +1,6 @@
 import invariant from 'invariant';
-import isFunction from 'is-function';
-import isPlainObject from 'is-plain-object';
+import isFunction from './utils/isFunction';
+import isPlainObject from './utils/isPlainObject';
 import identity from './utils/identity';
 import isNil from './utils/isNil';
 import isUndefined from './utils/isUndefined';

src/handleActions.js

@@ -1,6 +1,6 @@
 import reduceReducers from 'reduce-reducers';
-import isPlainObject from 'is-plain-object';
 import invariant from 'invariant';
+import isPlainObject from './utils/isPlainObject';
 import isMap from './utils/isMap';
 import ownKeys from './utils/ownKeys';
 import flattenReducerMap from './utils/flattenReducerMap';

src/utils/flattenActionMap.js

@@ -1,4 +1,4 @@
-import isPlainObject from 'is-plain-object';
+import isPlainObject from './isPlainObject';
 import flattenWhenNode from './flattenWhenNode';
 
 export default flattenWhenNode(isPlainObject);

src/utils/flattenReducerMap.js

@@ -1,4 +1,4 @@
-import isPlainObject from 'is-plain-object';
+import isPlainObject from './isPlainObject';
 import isMap from './isMap';
 import hasGeneratorInterface from './hasGeneratorInterface';
 import flattenWhenNode from './flattenWhenNode';

src/utils/isFunction.js

@@ -0,0 +1 @@
+export default value => typeof value === 'function';

src/utils/isPlainObject.js

@@ -0,0 +1,10 @@
+export default value => {
+  if (typeof value !== 'object' || value === null) return false;
+
+  let proto = value;
+  while (Object.getPrototypeOf(proto) !== null) {
+    proto = Object.getPrototypeOf(proto);
+  }
+
+  return Object.getPrototypeOf(value) === proto;
+};

src/utils/isSymbol.js

@@ -0,0 +1,4 @@
+export default value =>
+  typeof value === 'symbol' ||
+  (typeof value === 'object' &&
+    Object.prototype.toString.call(value) === '[object Symbol]');

yarn.lock

@@ -3456,10 +3456,6 @@ is-fullwidth-code-point@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz#a3b30a5c4f199183167aaab93beefae3ddfb654f"
 
-is-function@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/is-function/-/is-function-1.0.1.tgz#12cfb98b65b57dd3d193a3121f5f6e2f437602b5"
-
 is-generator-fn@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-generator-fn/-/is-generator-fn-1.0.0.tgz#969d49e1bb3329f6bb7f09089be26578b2ddd46a"