		module.exports = {
		koaMiddleware: require('./middlewares/koa'),
		expressMiddleware: require('./middlewares/express'),
		Parameters: require('./parameters')
		Parameters: require('./parameters'),
		ParameterMissingError: require('./parameter-missing-error')
		}

lib/parameters.js

		@@ -12,2 +12,3 @@ /**
		var _ = require('lodash')
		var ParameterMissingError = require('./parameter-missing-error')

		@@ -107,3 +108,3 @@ /**
		var param = Parameters.clone(this._fetch(key))
		if (!param) throw new Error('param `' + key + '` required')
		if (!param) throw new ParameterMissingError('param `' + key + '` required')
		if (!(param instanceof Parameters)) throw new Error('param `' + key + '` is not a Parameters instance')
		@@ -110,0 +111,0 @@ return param

package.json

		{
		"name": "strong-params",
		"version": "0.7.0",
		"version": "0.7.1",
		"description": "Rails-style strong parameters for javascript projects. (e.g. Express, Koa)",
		@@ -5,0 +5,0 @@ "main": "index.js",

README.md

		@@ -112,2 +112,14 @@ # strong-params

		### Errors

		```js
		// ParameterMissingError
		try {
		params.require('missingKey')
		} catch(err) {
		err instanceof ParameterMissingError // -> true
		err instanceof Error // -> true
		}
		```

		Look [Rails Strong Parameters specification](http://edgeguides.rubyonrails.org/action_controller_overview.html#strong-parameters) for more information.
		@@ -114,0 +126,0 @@

spec/parameters.js

		@@ -6,2 +6,3 @@ /* global beforeEach, describe, it */
		var Parameters = require('..').Parameters
		var ParameterMissingError = require('..').ParameterMissingError
		var PRIMITIVE_TYPES = [Boolean, Number, String, function Null () {
		@@ -111,3 +112,23 @@ this.valueOf = function () { return null }

		describe('instance methods', function () {})
		describe('instance methods', function () {
		describe('require', function () {
		var params
		beforeEach(function () {
		params = new Parameters({ requiredKey: {} })
		})
		describe('when required key passed', function () {
		it('should return instance of parameters', function () {
		params.require('requiredKey').should.be.a.instanceOf(Parameters)
		})
		})
		describe('when required key not passed', function () {
		it('should throw instance of ParameterMissingError with error message', function () {
		var requireFunction = function () {
		params.require('missingKey')
		}
		should.throws(requireFunction, ParameterMissingError, 'param `missingKey` required')
		})
		})
		})
		})

		@@ -114,0 +135,0 @@ describe('operations', function () {

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