Check-in

.babelrc

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+{
+  "presets": ["es2015"]
+}

.gitignore

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+# IntelliJ IDEA
+.idea
+*.iml
+
+# NPM
+node_modules
+npm-*.log
+
+# OS X
+.DS_Store

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2016 Daniel Lytkin
+
+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 TypeScript Actions
+
+A simple Action Creator library for TypeScript. Its goal is to provide simple
+yet type-safe experience with Redux actions.
+Created actions are FSA-compliant:
+
+```ts
+interface Action<P> {
+  type: string;
+  payload?: P;
+  error?: boolean;
+  meta?: Object;
+}
+``` 
+
+## Usage
+
+### Basic
+
+```ts
+import actionCreatorFactory from 'redux-typescript-actions';
+
+const actionCreator = actionCreatorFactory();
+
+// Specify payload shape as generic type argument. 
+const somethingHappened = actionCreator<{foo: string}>('SOMETHING_HAPPENED');
+
+// Get action creator type.
+console.log(somethingHappened.type);  // SOMETHING_HAPPENED
+
+// Create action.
+const action = somethingHappened({foo: 'bar'});
+console.log(action);  // {type: 'SOMETHING_HAPPENED', payload: {foo: 'bar'}}  
+```
+
+### Async Action Creators
+
+Async Action Creators are objects with properties `started`, `done` and 
+`failed` whose values are action creators. 
+
+```ts
+import actionCreatorFactory from 'redux-typescript-actions';
+
+const actionCreator = actionCreatorFactory();
+
+// specify parameters and result shapes as generic type arguments
+const doSomething = 
+  actionCreator.async<{foo: string}, {bar: number}>('DO_SOMETHING');
+
+console.log(doSomething.started({foo: 'lol'}));
+// {type: 'DO_SOMETHING_STARTED', payload: {foo: 'lol'}}
+
+console.log(doSomething.done({
+  params: {foo: 'lol'},
+  result: {bar: 42},
+});
+// {type: 'DO_SOMETHING_DONE', payload: {
+//   params: {foo: 'lol'},
+//   result: {bar: 42},
+// }}
+
+console.log(doSomething.failed({
+  params: {foo: 'lol'},
+  error: {code: 42},    
+});
+// {type: 'DO_SOMETHING_FAILED', payload: {
+//   params: {foo: 'lol'},
+//   error: {code: 42},
+// }, error: true}
+```
+  
+### Actions With Type Prefix
+
+You can specify a prefix that will be prepended to all action types. This is 
+useful to namespace library actions as well as for large projects where it's 
+convenient to keep actions near the component that dispatches them. 
+
+```ts
+// MyComponent.actions.ts
+import actionCreatorFactory from 'redux-typescript-actions';
+
+const actionCreator = actionCreatorFactory('MyComponent');
+
+const somethingHappened = actionCreator<{foo: string}>('SOMETHING_HAPPENED');
+
+const action = somethingHappened({foo: 'bar'});
+console.log(action);  
+// {type: 'MyComponent/SOMETHING_HAPPENED', payload: {foo: 'bar'}}  
+```
+
+### Reducers
+
+```ts
+// actions.ts
+import actionCreatorFactory from 'redux-typescript-actions';
+
+const actionCreator = actionCreatorFactory();
+
+export const somethingHappened = 
+  actionCreator<{foo: string}>('SOMETHING_HAPPENED');
+
+
+// reducer.ts
+import {Action} from 'redux';
+import {isType, Action} from 'redux-typescript-actions';
+import {somethingHappened} from './actions';
+
+type State = {bar: string};
+
+const reducer = (state: State, action: Action): State => {
+  if (isType(action, somethingHappened)) {
+    // action.payload is inferred as {foo: string};
+
+    action.payload.bar;  // error
+
+    return {bar: action.payload.foo};
+  }
+
+  return state; 
+};
+```
+
+## API
+
+### `actionCreatorFactory(prefix?: string): ActionCreatorFactory`
+
+Creates Action Creator factory with optional prefix for action types.
+
+* `prefix?: string`: Prefix to be prepended to action types.
+
+### `isType(action: Action, actionCreator: ActionCreator): boolean`
+
+Returns `true` if action has the same type as action creator. Defines 
+[Type Guard](https://www.typescriptlang.org/docs/handbook/advanced-types.html#user-defined-type-guards)
+that lets TypeScript know `payload` type inside blocks where `isType` returned
+`true`:
+
+```ts
+const somethingHappened = actionCreator<{foo: string}>('SOMETHING_HAPPENED');
+
+if (isType(action, somethingHappened)) {
+  // action.payload has type {foo: string};
+}
+```

es6/index.js

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+export function isType(action, actionCreator) {
+    return action.type === actionCreator.type;
+}
+export default function actionCreatorFactory(prefix) {
+    const actionTypes = {};
+    function actionCreator(type, commonMeta, error) {
+        if (actionTypes[type])
+            throw new Error(`Duplicate action type: ${type}`);
+        actionTypes[type] = true;
+        const fullType = prefix ? `${prefix}/${type}` : type;
+        return Object.assign((payload, meta) => {
+            const action = {
+                type: fullType,
+                payload,
+                meta: Object.assign({}, commonMeta, meta),
+            };
+            if (error)
+                action.error = error;
+            return action;
+        }, { type: fullType });
+    }
+    function asyncActionCreators(type, commonMeta) {
+        return {
+            type: prefix ? `${prefix}/${type}` : type,
+            started: actionCreator(`${type}_STARTED`, commonMeta),
+            done: actionCreator(`${type}_DONE`, commonMeta),
+            failed: actionCreator(`${type}_FAILED`, commonMeta, true),
+        };
+    }
+    return Object.assign(actionCreator, { async: asyncActionCreators });
+}

index.d.ts

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+import { Action as ReduxAction } from "redux";
+export interface Action<P> extends ReduxAction {
+    type: string;
+    payload?: P;
+    error?: boolean;
+    meta?: Object;
+}
+export declare function isType<P>(action: ReduxAction, actionCreator: ActionCreator<P>): action is Action<P>;
+export interface ActionCreator<P> {
+    type: string;
+    (payload?: P, meta?: Object): Action<P>;
+}
+export interface AsyncActionCreators<P, R> {
+    type: string;
+    started: ActionCreator<P>;
+    done: ActionCreator<{
+        params: P;
+        result: R;
+    }>;
+    failed: ActionCreator<{
+        params: P;
+        error: any;
+    }>;
+}
+export interface ActionCreatorFactory {
+    <P>(type: string, commonMeta?: Object, error?: boolean): ActionCreator<P>;
+    async<P, S>(type: string, commonMeta?: Object): AsyncActionCreators<P, S>;
+}
+export default function actionCreatorFactory(prefix?: string): ActionCreatorFactory;

lib/index.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.isType = isType;
+exports.default = actionCreatorFactory;
+function isType(action, actionCreator) {
+    return action.type === actionCreator.type;
+}
+function actionCreatorFactory(prefix) {
+    var actionTypes = {};
+    function actionCreator(type, commonMeta, error) {
+        if (actionTypes[type]) throw new Error("Duplicate action type: " + type);
+        actionTypes[type] = true;
+        var fullType = prefix ? prefix + "/" + type : type;
+        return Object.assign(function (payload, meta) {
+            var action = {
+                type: fullType,
+                payload: payload,
+                meta: Object.assign({}, commonMeta, meta)
+            };
+            if (error) action.error = error;
+            return action;
+        }, { type: fullType });
+    }
+    function asyncActionCreators(type, commonMeta) {
+        return {
+            type: prefix ? prefix + "/" + type : type,
+            started: actionCreator(type + "_STARTED", commonMeta),
+            done: actionCreator(type + "_DONE", commonMeta),
+            failed: actionCreator(type + "_FAILED", commonMeta, true)
+        };
+    }
+    return Object.assign(actionCreator, { async: asyncActionCreators });
+}

package.json

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+{
+  "name": "redux-typescript-actions",
+  "version": "1.0.0",
+  "description": "Type-safe action creator utilities",
+  "keywords": [
+    "redux"
+  ],
+  "main": "lib/index.js",
+  "jsnext:main": "es6/index.js",
+  "typings": "./index.d.ts",
+  "files": [
+    "es6",
+    "lib",
+    "index.d.ts"
+  ],
+  "scripts": {
+    "build:es6": "tsc",
+    "build:commonjs": "babel es6 --out-dir lib",
+    "build": "npm run build:es6 && npm run build:commonjs"
+  },
+  "author": "Daniel Lytkin <dan.lytkin@gmail.com>",
+  "license": "MIT",
+  "dependencies": {
+    "redux": "^3.6.0"
+  },
+  "devDependencies": {
+    "babel-core": "^6.17.0",
+    "babel-preset-es2015": "^6.16.0",
+    "typescript": "^2.0.3"
+  }
+}