🎀 handle-rejection: Handle unhandled rejections

Author: omrilotan

.eslintrc

@@ -30,6 +30,9 @@
 				"assert": true,
 				"sleep": true,
 				"freeze": true
+			},
+			"rules": {
+				"no-console": 0
 			}
 		},
 		{

README.md

@@ -16,6 +16,7 @@ Mono repo holding multiple packages
 | **`doamrn`** | [Retrieve a random item from the arguments](./packages/doamrn#readme) | [![1.0.2](https://img.shields.io/npm/v/doamrn.svg)](https://www.npmjs.com/package/doamrn)
 | **`edit-package`** | [Read, write and reset package.json](./packages/edit-package#readme) | [![1.0.1](https://img.shields.io/npm/v/edit-package.svg)](https://www.npmjs.com/package/edit-package)
 | **`@recursive/flatten`** | [Flatten arrays of arrays, as long as all the members are arrays](./packages/flatten#readme) | [![0.0.0](https://img.shields.io/npm/v/@recursive/flatten.svg)](https://www.npmjs.com/package/@recursive/flatten)
+| **`handle-rejection`** | [💀 Handle unhandled rejections](./packages/handle-rejection#readme) | [![0.0.0](https://img.shields.io/npm/v/handle-rejection.svg)](https://www.npmjs.com/package/handle-rejection)
 | **`hypertonia`** | [A theme for Hyper.](./packages/hypertonia#readme) | [![0.2.6](https://img.shields.io/npm/v/hypertonia.svg)](https://www.npmjs.com/package/hypertonia)
 | **`index-require`** | [Create an index for a lib directory](./packages/index-require#readme) | [![0.1.0](https://img.shields.io/npm/v/index-require.svg)](https://www.npmjs.com/package/index-require)
 | **`jsnpm`** | [Use NPM in Javascript runtime](./packages/jsnpm#readme) | [![0.3.2](https://img.shields.io/npm/v/jsnpm.svg)](https://www.npmjs.com/package/jsnpm)

packages/handle-rejection/.gitattributes

@@ -0,0 +1 @@
+* text eol=lf

packages/handle-rejection/.npmignore

@@ -0,0 +1,3 @@
+.*
+*.log
+spec.js

packages/handle-rejection/.npmrc

@@ -0,0 +1,2 @@
+package-lock=false
+access=public

packages/handle-rejection/README.md

@@ -0,0 +1,18 @@
+# handle-rejection [![](https://img.shields.io/npm/v/handle-rejection.svg)](https://www.npmjs.com/package/handle-rejection) [![](https://img.shields.io/badge/source--000000.svg?logo=github&style=social)](https://github.com/omrilotan/mono/tree/master/packages/handle-rejection)
+
+## 💀 Handle unhandled rejections
+
+Built in single handlers
+```js
+require('handle-rejection').console(); // console.error(error)
+require('handle-rejection').exit(); // process.exit(1)
+require('handle-rejection').throw(); // throw error
+```
+
+Combined handlers (built in and custom)
+```js
+require('handle-rejection')(
+	error => Raven.captureException(error) // custom
+	'exit', // built in
+);
+```

packages/handle-rejection/handlers/console.js

@@ -0,0 +1 @@
+module.exports = console.error; // eslint-disable-line no-console

packages/handle-rejection/handlers/exit.js

@@ -0,0 +1,3 @@
+module.exports = () => {
+	process.exit(1);
+};

packages/handle-rejection/handlers/throw.js

@@ -0,0 +1 @@
+module.exports = error => { throw error; };

packages/handle-rejection/index.js

@@ -0,0 +1,34 @@
+const BUILT_IN = [
+	'console',
+	'exit',
+	'throw',
+];
+
+const handle = fn => process.on('unhandledRejection', fn);
+
+function bundle(...handlers) {
+	handle(
+		error => handlers.forEach(handler => {
+			switch (typeof handler) {
+				case 'function':
+					handler(error);
+					break;
+				case 'string':
+					if (BUILT_IN.includes(handler)) {
+						require(`./handlers/${handler}`)(error);
+					}
+					break;
+			}
+		})
+	);
+}
+
+BUILT_IN.reduce(
+	(accumulator, key) => Object.assign(
+		accumulator,
+		{[key]: handle(require(`./handlers/${key}`))}
+	),
+	bundle
+);
+
+module.exports = bundle;

packages/handle-rejection/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "handle-rejection",
+  "version": "0.0.0",
+  "description": "💀 Handle unhandled rejections",
+  "keywords": [
+    "unhandledRejection",
+    "handle rejection",
+    "error",
+    "handler",
+    "process",
+    "💀"
+  ],
+  "author": "omrilotan",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/omrilotan/mono.git"
+  },
+  "homepage": "https://omrilotan.com/mono/handle-rejection/",
+  "main": "index.js",
+  "scripts": {
+    "test": "cd ../../; npm t handle-rejection; cd -"
+  }
+}

packages/handle-rejection/spec.js

@@ -0,0 +1,40 @@
+const stubs = {};
+let handle;
+
+describe('handle-rejection', async() => {
+	const on = process.on;
+	const consoleerror = console.error;
+
+	beforeEach(() => {
+		process.on = (...args) => stubs.on(...args);
+		console.error = (...args) => stubs.console(...args);
+		stubs.on = () => null;
+		delete require.cache[require.resolve('.')];
+		handle = require('.');
+	});
+
+	after(() => {
+		delete require.cache[require.resolve('.')];
+		process.on = on;
+		console.error = consoleerror;
+	});
+	it('Should call on multiple handlers', async() => {
+		let consoled = false;
+		let called = false;
+
+		stubs.console = () => {
+			consoled = true;
+		}
+		function custom() {
+			called = true;
+		}
+
+		stubs.on = (name, fn) => fn();
+
+		handle('console', custom);
+
+		expect(called).to.be.true;
+		expect(consoled).to.be.true;
+
+	});
+});