Merge pull request serverless-heaven#355 from serverless-heaven/webpack-4-example

Added Webpack 4 example

Author: HyperBrain

examples/babel-webpack-4/.babelrc

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+{
+  "comments": false,
+  "presets": [
+    [ "env", { "node": "6.10" } ]
+  ],
+  "plugins": [
+    "source-map-support"
+  ]
+}

examples/babel-webpack-4/README.md

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+This is the default babel webpack-4 example to look at, because only dynamic entry point resolution lets you use Serverless completely. Individual packaging with a per-function dependency optimization is only available with that approach.
+
+You can also try to invoke a function locally:
+```
+serverless invoke local --function=first --path=./event.json
+```

examples/babel-webpack-4/event.json

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+{
+  "key3": "value3",
+  "key2": "value2",
+  "key1": "value1"
+}

examples/babel-webpack-4/handlers/first.js

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+import { App } from '../lib/App';
+
+export const hello = (event, context, cb) => {
+  context.callbackWaitsForEmptyEventLoop = false;
+
+  // Do not return the promise as we use the callback
+  // This resolved promise would be be in the application library code in a real-world application and provide the results
+  App.handleFirst(event)  // eslint-disable-line promise/catch-or-return
+  .then(result => ({
+    statusCode: 200,
+    headers: {
+      'Content-Type': 'application/json;charset=utf-8'
+    },
+    body: JSON.stringify(result)
+  }))
+  .asCallback(cb);
+
+  return;
+};

examples/babel-webpack-4/handlers/second.js

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+import { App } from '../lib/App';
+
+export const hello = (event, context, cb) => {
+  context.callbackWaitsForEmptyEventLoop = false;
+
+  // Do not return the promise as we use the callback
+  // This resolved promise would be be in the application library code in a real-world application and provide the results
+  App.handleSecond(event)  // eslint-disable-line promise/catch-or-return
+  .then(result => ({
+    statusCode: 200,
+    headers: {
+      'Content-Type': 'application/json;charset=utf-8'
+    },
+    body: JSON.stringify(result)
+  }))
+  .asCallback(cb);
+
+  return;
+};

examples/babel-webpack-4/lib/App.js

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+import BbPromise from 'bluebird';
+
+const THE_MESSAGE = 'Hello from the webpack 4 sample';
+
+export class App {
+  static handleFirst(event) {
+    const myDemoResult = {
+      message: App.THE_MESSAGE,
+      from: 'First lambda ;-)',
+      event
+    };
+    
+    return BbPromise.resolve(myDemoResult);
+  }
+
+  static handleSecond(event) {
+    const myDemoResult = {
+      message: THE_MESSAGE,
+      from: 'Second lambda ;-)',
+      event
+    };
+    
+    return BbPromise.resolve(myDemoResult);
+  }
+}