init commit

Author: jamestalmage

.editorconfig

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+root = true
+
+[*]
+indent_style = tab
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{package.json,*.yml}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+* text=auto

.gitignore

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+node_modules

.travis.yml

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+language: node_js
+node_js:
+  - 'stable'
+  - '0.12'
+  - '0.10'

index.js

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+'use strict';
+var objectAssign = require('object-assign');
+
+module.exports = function (options) {
+	var chainables = options.chainables || {};
+
+	return function (target, fn) {
+		fn = fn || target;
+
+		function wrap(createOpts, extensionOpts) {
+			function wrappedOpts() {
+				return objectAssign(createOpts(), extensionOpts);
+			}
+
+			function wrappedFn() {
+				var args = Array.prototype.slice.call(arguments);
+				fn(wrappedOpts(), args);
+			}
+
+			Object.keys(chainables).forEach(function (key) {
+				Object.defineProperty(wrappedFn, key, {
+					get: function () {
+						return wrap(wrappedOpts, chainables[key]);
+					}
+				});
+			});
+
+			return wrappedFn;
+		}
+
+		return wrap(function () {
+			return objectAssign({}, options.defaults);
+		});
+	};
+};

license

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+The MIT License (MIT)
+
+Copyright (c) James Talmage <james@talmage.io> (github.com/jamestalmage)
+
+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.

package.json

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+{
+  "name": "option-chain",
+  "version": "0.0.0",
+  "description": "My supreme module",
+  "license": "MIT",
+  "repository": "jamestalmage/option-chain",
+  "author": {
+    "name": "James Talmage",
+    "email": "james@talmage.io",
+    "url": "github.com/jamestalmage"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "xo && ava"
+  },
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    ""
+  ],
+  "devDependencies": {
+    "ava": "^0.10.0",
+    "xo": "^0.12.1"
+  },
+  "dependencies": {
+    "object-assign": "^4.0.1"
+  }
+}

readme.md

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+# option-chain [![Build Status](https://travis-ci.org/jamestalmage/option-chain.svg?branch=master)](https://travis-ci.org/jamestalmage/option-chain)
+
+> My supreme module
+
+
+## Install
+
+```
+$ npm install --save option-chain
+```
+
+
+## Usage
+
+```js
+const optionChain = require('option-chain');
+
+optionChain('unicorns');
+//=> 'unicorns & rainbows'
+```
+
+
+## API
+
+### optionChain(input, [options])
+
+#### input
+
+Type: `string`
+
+Lorem ipsum.
+
+#### options
+
+##### foo
+
+Type: `boolean`  
+Default: `false`
+
+Lorem ipsum.
+
+
+## License
+
+MIT © [James Talmage](http://github.com/jamestalmage)

test.js

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+import test from 'ava';
+import fn from './';
+
+test('defaults and args are passed', t => {
+	t.plan(2);
+	fn({
+		defaults: {foo: 'bar'}
+	})(function (opts, args) {
+		t.same(opts, {foo: 'bar'});
+		t.same(args, ['uni', 'corn']);
+	})('uni', 'corn');
+});
+
+test('chainables extend the options passed', t => {
+	t.plan(2);
+	fn({
+		defaults: {foo: 'bar'},
+		chainables: {
+			moo: {cow: true}
+		}
+	})(function (opts, args) {
+		t.same(opts, {foo: 'bar', cow: true});
+		t.same(args, ['duck', 'goose']);
+	}).moo('duck', 'goose');
+});
+
+test('last item in the chain takes precedence', t => {
+	t.plan(4);
+
+	const config = fn({
+		chainables: {
+			foo: {foo: true},
+			notFoo: {foo: false}
+		}
+	});
+
+	let expected = true;
+
+	function isExpected(opts) {
+		t.is(opts.foo, expected);
+	}
+
+	const notFoo = config(isExpected).notFoo;
+	const foo = config(isExpected).foo;
+
+	foo();
+	notFoo.foo();
+
+	expected = false;
+
+	notFoo();
+	foo.notFoo();
+});