🎉 version 1.0.0

.gitignore

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+# https://github.com/github/gitignore/blob/master/Node.gitignore
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next
+
+yarn.lock
+
+lib

.npmrc

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+package-lock=false

.travis.yml

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+language: node_js
+
+node_js:
+  - "8"
+  - "10"
+
+after_success: npm run test && npm run coverage
+
+jobs:
+  include:
+    - stage: npm release
+      node_js: 10
+      script: echo "deploying to npm"
+      deploy:
+        provider: npm
+        email: uniquecolesmith@gmail.com
+        api_key: $NPM_AUTH_TOKEN
+        skip_cleanup: true
+        on:
+          tags: true

LICENSE

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+MIT License
+
+Copyright (c) 2018 Eason
+
+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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+# rematch
+
+[![NPM version](https://img.shields.io/npm/v/@zcorky/rematch.svg?style=flat)](https://www.npmjs.com/package/@zcorky/rematch)
+[![Coverage Status](https://img.shields.io/coveralls/zcorky/rematch.svg?style=flat)](https://coveralls.io/r/zcorky/rematch)
+[![Dependencies](https://david-dm.org/@zcorky/rematch/status.svg)](https://david-dm.org/@zcorky/rematch)
+[![Build Status](https://travis-ci.com/zcorky/rematch.svg?branch=master)](https://travis-ci.com/zcorky/rematch)
+![license](https://img.shields.io/github/license/zcorky/rematch.svg)
+[![issues](https://img.shields.io/github/issues/zcorky/rematch.svg)](https://github.com/zcorky/rematch/issues)
+
+> Stop `switch`, love `rematch` with Redux.
+
+### Install
+
+```
+$ npm install @zcorky/rematch
+```
+
+### Usage
+
+```javascript
+import rematch from '@zcorky/rematch';
+
+// before
+export function app(state, action) {
+	switch(action.type) {
+		case '+':
+			return { ...state, value: state.value + action.payload };
+		case '-':
+			return { ...state, value: state.value - action.payload };
+		case 'x':
+			return { ...state, value: state.value * action.payload };
+		case '/':
+			return { ...state, value: state.value / action.payload };
+		// ....
+		default:
+			return state;
+	}
+}
+
+// after
+export const app = rematch({
+	'+': (state, action) => ({ ...state, value: state.value + action.payload }),
+	'-': (state, action) => ({ ...state, value: state.value - action.payload }),
+	'x': (state, action) => ({ ...state, value: state.value * action.payload }),
+	'/': (state, action) => ({ ...state, value: state.value / action.payload }),
+	// ...
+});
+```

package.json

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+{
+  "name": "@zcorky/rematch",
+  "version": "1.0.0",
+  "description": "Use rematch instead of siwtch in Redux",
+  "main": "lib/index.js",
+  "repository": "https://github.com/zcorky/rematch",
+  "author": "Zero",
+  "license": "MIT",
+  "scripts": {
+    "build": "npm run clean && tsc",
+    "clean": "rimraf -rf lib",
+    "test": "NODE_ENV=test nyc mocha test/*.spec.ts --exit --timeout 10000",
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "prepublish": "npm run build"
+  },
+  "devDependencies": {
+    "@types/mocha": "^5.2.5",
+    "@types/node": "^10.9.4",
+    "@types/sinon": "^5.0.2",
+    "chai": "^4.1.2",
+    "coveralls": "^3.0.2",
+    "mocha": "^5.2.0",
+    "nyc": "^13.0.1",
+    "rimraf": "^2.6.2",
+    "sinon": "^6.3.4",
+    "source-map-support": "^0.5.9",
+    "ts-node": "^7.0.1",
+    "tslint": "^5.10.0",
+    "tslint-eslint-rules": "^5.3.1",
+    "tslint-jsdoc-rules": "^0.1.2",
+    "typescript": "^3.1.1"
+  },
+  "files": [
+    "lib/"
+  ],
+  "nyc": {
+    "check-coverage": true,
+    "include": [
+      "src/*.ts"
+    ],
+    "extension": [
+      ".ts"
+    ],
+    "require": [
+      "ts-node/register",
+      "source-map-support/register"
+    ],
+    "sourceMap": true,
+    "instrument": true
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@zcorky/is": "^1.0.0"
+  }
+}

src/index.ts

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+export interface Action {
+  type: string
+}
+
+export function rematch<S, A extends Action>(mappings: Record<string, (state: S, action: A) => S>) {
+
+  return function(state: S, action: A): S {
+    const mapping = mappings[action.type];
+    if (!mapping) return state;
+
+    return mapping(state, action);
+  }
+}
+
+export default rematch;

test/index.spec.ts

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+import { expect } from 'chai';
+
+import rematch from '../src';
+
+describe('classnames', () => {
+  it('rematch reducer primitive', () => {
+    type State = number;
+    interface Action { type: string };
+
+    const reducer = rematch<State, Action>({
+      '+': (state) => state + 1,
+      '-': (state) => state - 1,
+    });
+
+    expect(reducer(1, { type: '+' })).to.equal(2);
+    expect(reducer(1, { type: '-' })).to.equal(0);
+    expect(reducer(1, { type: 'x' })).to.equal(1);
+    expect(reducer(1, { type: '/' })).to.equal(1);
+  });
+
+  it('rematch reducer immutable', () => {
+    type State = Readonly<{ value: number }>;
+    type Action = Readonly<{ type: string }>;
+
+    const reducer = rematch<State, Action>({
+      '+': (state) => ({ ...state, value: state.value + 1 }),
+      '-': (state) => ({ ...state, value: state.value - 1 }),
+      // 'x': (state) => (state.value *= 2, state), // @readonly keep immutable
+    });
+
+    expect(reducer({ value: 1 }, { type: '+' })).to.deep.equal({ value: 2 });
+    expect(reducer({ value: 1 }, { type: '-' })).to.deep.equal({ value: 0 });
+    expect(reducer({ value: 1 }, { type: 'x' })).to.deep.equal({ value: 1 });
+    expect(reducer({ value: 1 }, { type: '/' })).to.deep.equal({ value: 1 });
+  });
+
+  it('rematch reducer with action.payload', () => {
+    type State = Readonly<{ step: 'FIRST' | 'SECOND' | 'END' }>;
+    type Action = Readonly<{ type: string, payload: 'FIRST' | 'SECOND' | 'END' }>;
+
+    const reducer = rematch<State, Action>({
+      'app/step': (state, { payload: step }) => ({ ...state, step  }),
+    });
+
+    expect(reducer({ step: 'FIRST' }, { type: 'app/step', payload: 'SECOND' })).to.deep.equal({ step: 'SECOND' });
+    expect(reducer({ step: 'FIRST' }, { type: 'app/step', payload: 'END' })).to.deep.equal({ step: 'END' });
+  });
+});

tsconfig.json

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+{
+    "compilerOptions": {
+        "moduleResolution": "node",
+        "module": "commonjs",
+        "target": "es5",
+        "strictNullChecks": true,
+        "noImplicitThis": false,
+        "noUnusedLocals": true,
+        "noImplicitAny": false,
+        "outDir": "lib",
+        "lib": ["es2015", "es7"],
+        "declaration": true,
+        "sourceMap": false,
+        "removeComments": true
+    },
+    "include": ["src/**/*.ts"]
+}