init

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["env"]
+}

.eslintrc.yml

@@ -0,0 +1,43 @@
+# root
+root: true
+
+# code env
+env:
+  node: true
+  mocha: true
+  es6: true
+
+# rules
+rules:
+  # basic
+  semi: [error, never]
+  quotes: [error, single, { allowTemplateLiterals: true }]
+  eqeqeq: error
+  camelcase: error
+  radix: error
+  yoda: error
+  no-var: error
+  no-const-assign: error
+  strict: [error, global]
+  comma-dangle: [error, only-multiline]
+
+  # indent
+  indent: [error, 2, { SwitchCase: 1 }]
+
+  # brace
+  curly: [error, multi-line]
+  brace-style: error
+
+  # disable default
+  no-unused-vars: off
+  no-console: off
+  no-unreachable: off
+  require-yield: off
+  no-constant-condition: off
+
+parserOptions:
+  ecmaVersion: 6
+  sourceType: module
+
+extends:
+  - 'eslint:recommended'

.gitignore

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+logs
+*.log
+.DS_Store
+
+npm-debug.log*
+node_modules
+
+.nyc_output
+coverage
+coverage.*
+
+# build file
+lib

.travis.yml

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+language: node_js
+node_js:
+  - 7
+script: "npm run test-cover"
+after_script: "npm run report-cover"
+notifications:
+  email: false

CHANGELOG.md

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+# CHANGELOG
+
+## v0.0.1 2017-08-20
+- first release

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 Magicdawn([email protected])
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# redux-standard-reducer
+> A reducer that handles standard action
+
+[![Build Status](https://img.shields.io/travis/magicdawn/reduce-reducers.svg?style=flat-square)](https://travis-ci.org/magicdawn/reduce-reducers)
+[![Coverage Status](https://img.shields.io/codecov/c/github/magicdawn/reduce-reducers.svg?style=flat-square)](https://codecov.io/gh/magicdawn/reduce-reducers)
+[![npm version](https://img.shields.io/npm/v/redux-standard-reducer.svg?style=flat-square)](https://www.npmjs.com/package/redux-standard-reducer)
+[![npm downloads](https://img.shields.io/npm/dm/redux-standard-reducer.svg?style=flat-square)](https://www.npmjs.com/package/redux-standard-reducer)
+[![npm license](https://img.shields.io/npm/l/redux-standard-reducer.svg?style=flat-square)](http://magicdawn.mit-license.org)
+
+## Install
+```sh
+$ npm i redux-standard-reducer --save
+```
+
+## API
+```js
+const reduxStandardReducer = require('redux-standard-reducer');
+```
+
+## Changelog
+[CHANGELOG.md](CHANGELOG.md)
+
+## License
+the MIT License http://magicdawn.mit-license.org

package.json

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+{
+  "name": "redux-standard-reducer",
+  "version": "0.0.1",
+  "description": "A reducer that handles standard action",
+  "main": "lib/index.js",
+  "dependencies": {
+    "lodash.mergewith": "^4.6.0"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-polyfill": "^6.26.0",
+    "babel-preset-env": "^1.6.0",
+    "babel-register": "^6.26.0",
+    "codecov": "^2.2.0",
+    "eslint": "^4.5.0",
+    "istanbul": "^1.1.0-alpha.1",
+    "mocha": "^2.5.3",
+    "reduce-reducers": "^0.1.2",
+    "redux": "^3.7.2",
+    "should": "^11.2.1"
+  },
+  "scripts": {
+    "build": "babel src -d lib",
+    "test": "mocha",
+    "test-cover": "istanbul cover _mocha -- -u exports",
+    "report-cover": "codecov"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://[email protected]/magicdawn/redux-standard-reducer.git"
+  },
+  "keywords": [
+    "redux",
+    "reducer",
+    "standard"
+  ],
+  "author": "magicdawn",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/magicdawn/redux-standard-reducer/issues"
+  },
+  "homepage": "https://github.com/magicdawn/redux-standard-reducer#readme"
+}

src/index.js

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+import _mergeWith from 'lodash.mergewith'
+
+// lodash, mergeWith
+export const customMerger = (cur, newValue) => {
+  if (Array.isArray(newValue)) {
+    return newValue
+  }
+}
+
+export function mergeState(...args) {
+  return _mergeWith({}, ...args, customMerger)
+}
+
+/**
+ * handle
+ * {
+ *  type: STANDARD_MERGE_STATE_XXX
+ *  payload: { to be merged }
+ * }
+ *
+ * or
+ * {
+ *  type: XXX,
+ *  standard: true,
+ *  payload: {xxx}
+ * }
+ */
+
+export default function standardReducer(state, action) {
+  if (!action || !action.type || !action.payload) return state
+
+  // STANDARD_MERGE_STATE
+  const ok =
+    action.type.startsWith('STANDARD_MERGE_STATE') || Boolean(action.standard)
+  if (!ok) return state
+
+  return mergeState(state, action.payload)
+}

test/.eslintrc.yml

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+parserOptions:
+  ecmaVersion: 8

test/mocha.opts

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+-R spec
+--require should
+--require babel-polyfill
+--compilers js:babel-register

test/simple.js

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+import standardReducer from '../src/index'
+import { combineReducers } from 'redux'
+import reduceReducers from 'reduce-reducers'
+
+describe('Simple', function() {
+  it('It works', function() {
+    const reducer = reduceReducers(
+      standardReducer,
+      combineReducers({
+        partial1(state = { value: 1, foo: 'bar-1' }, action) {
+          return state
+        },
+
+        partial2(state = { value: 2, foo: 'bar-2' }, action) {
+          return state
+        },
+      })
+    )
+
+    let state = {}
+
+    // init
+    state = reducer(state, { type: 'init' })
+    state.partial1.value.should.equal(1)
+    state.partial2.value.should.equal(2)
+
+    // using type = STANDARD_MERGE_STATE_
+    state = reducer(state, {
+      type: 'STANDARD_MERGE_STATE_MODIFY_PARTIAL1',
+      payload: {
+        partial1: {
+          value: 'modifyed-1',
+        },
+      },
+    })
+    // console.log(state)
+    state.partial1.value.should.equal('modifyed-1')
+    state.partial1.foo.should.equal('bar-1') // unchanged
+
+    // using action.standard
+    state = reducer(state, {
+      type: 'MODIFY_PARTIAL_2',
+      standard: true,
+      payload: {
+        partial2: {
+          value: 'modifyed-2',
+        },
+      },
+    })
+    state.partial2.value.should.equal('modifyed-2')
+    state.partial2.foo.should.equal('bar-2') // unchanged
+  })
+})