fix: remove deepmerge to prevent wrong merges

package.json

@@ -76,7 +76,6 @@
   "dependencies": {
     "callbag-observe": "^1.0.0",
     "callbag-subject": "^1.0.2",
-    "deepmerge": "^2.1.1",
     "fast-deep-equal": "^2.0.1",
     "react": "^16.4.2",
     "react-dom": "^16.4.2"

src/reworm.tsx

@@ -2,7 +2,6 @@ import React, { PureComponent } from 'react'
 import observe from 'callbag-observe'
 import makeSubject from 'callbag-subject'
 import equal from 'fast-deep-equal'
-import merge from 'deepmerge'
 
 const isPrimitive = (test: any) => test !== Object(test)
 
@@ -48,7 +47,7 @@ export function create<T = any>(initial: T = {} as T): State<T> {
     private update = (next: T): void => {
       const nextState = typeof next === 'function' ? next(this._state) : next
       const newState = !isPrimitive(nextState)
-        ? merge(this._state, nextState)
+        ? Object.assign({}, this._state, nextState)
         : nextState
 
       const isEqual = !isPrimitive(newState)

src/types.d.ts

@@ -1,4 +1,3 @@
-declare module 'deepmerge'
 declare module 'fast-deep-equal'
 declare module 'callbag-observe'
 declare module 'callbag-subject'

yarn.lock

@@ -1093,10 +1093,6 @@ deep-is@~0.1.3:
   version "0.1.3"
   resolved "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
 
-deepmerge@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.npmjs.org/deepmerge/-/deepmerge-2.1.1.tgz#e862b4e45ea0555072bf51e7fd0d9845170ae768"
-
 default-require-extensions@^2.0.0:
   version "2.0.0"
   resolved "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-2.0.0.tgz#f5f8fbb18a7d6d50b21f641f649ebb522cfe24f7"