Merge pull request microsoft#154 from Reltre/js_ts_mix

Add a sample of using JS and TS together with allowJS option

Author: Orta

js-and-ts/README.md

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+# TypeScript Sample: Mixing TypeScript and JavaScript
+
+## Overview 
+
+A sample of how to use the `allowJS` option to use both JavaScript and TypeScript together.
+A simple text formatter is provided, written in JavaScript. This formatter is then used
+within a TypeScript class to format a computation.
+
+To run this sample, you must have `node` installed. You can also use `ts-node` to run this directly
+without a compilation from TypeScript to JavaScript.
+
+## Running 
+
+```bash
+$ tsc robot.ts`
+$ node robot.js`
+```

js-and-ts/format.js

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+const surroundWithStars = (value) => {
+  const valueLength = value.toString().length;
+  const topBottomBorder = '*'.repeat(valueLength + 2);
+
+  return topBottomBorder
+         + "\n"
+         + '*' + value.toString() + '*'
+         + "\n"
+         + topBottomBorder;
+}
+
+module.exports.Formatter = { surroundWithStars };
+

js-and-ts/robot.ts

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+// This import wouldn't be possible without the allowJS option in tsconfig
+import { Formatter } from './format.js'; 
+
+interface Robot {
+  name: String;
+  currentComputation: Number;
+}
+
+class Robot {
+  constructor(public name: String) {
+    this.name = name;
+    this.currentComputation = 0;
+  }
+
+  // Given a mathematical operation, return a value based on the value passed,
+  // the operation and the number 10
+  compute(operation, value) {
+    let computedValue = 0;
+    switch(operation) {
+      case '+':
+        computedValue = value + 10;
+        break;
+      case '-':
+        computedValue = value - 10;
+        break;
+      case '/':
+        computedValue = value / 10;
+        break;
+      case '*':
+        computedValue = value * 10;
+        break;
+      default:
+        console.log("Does not compute!!")
+    } 
+    this.currentComputation = computedValue;
+  }
+
+  // Using an external JS module, format the computed value from our robot
+  displayCurrentComputation() {
+    console.log(Formatter.surroundWithStars(this.currentComputation));
+  }
+}
+
+const hal = new Robot('Hal');
+hal.compute('+', 32);
+hal.displayCurrentComputation();

js-and-ts/tsconfig.json

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+{
+  "compilerOptions": {
+    "outDir": "./built",
+    "sourceMap": true,
+    "allowJs": true,
+    "target": "es6"
+  },
+  "include": [
+      "./**/*"
+  ]
+}